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1 letter
1. буква, литера2. вытисненное название; вытиснять буквы или название3. формат бумаги 25,4?40,6 смletter size — формат,4Х40,6 см
4. письмоaccented letter — буква со знаком ударения; акцентированная буква
bad letter — плохо отпечатанная буква, дефектная буква
bastard letter — «чужая» буква; «чужой» знак; буква или знак другой гарнитуры
5. гротесковый шрифт; рубленый шрифт, шрифт без засечекanonymous letter — письмо без подписи; анонимка
white letter — антиква, прямой латинский шрифт
6. печатная буква7. деревянный шрифтbuilt-up letter — буква, нарисованная контуром с последующей заливкой
commercial letter — формат писчей бумаги 27,9?43,1 см, сфальцованной до 12,7?20,3 см
decorated letter — буква с орнаментом, буква фигурного шрифта
8. крупные вырезные литеры9. выделительный шрифт10. лигатура11. формат бумаги 40,6?50,8 см12. врезанный в текст инициалnewsy letter — письмо, в котором изложены все новости
13. буква с нижним выносным элементомglue-on display letters — буквы с клеевым слоем, используемые при изготовлении крупных надписей
lowercase letter — строчная буква; знак нижнего регистра
letter of the law — буква, формальный смысл закона
14. начальная буква15. инициалitalic letter — курсивная буква; курсивный шрифт
kerned letter — буква с выносным элементом, выступающим за пределы кегля
personalized form letter — стандартное письмо-реклама, печатаемое с фамилией адресата
16. графема буквы17. буква узкого шрифта с очень тонкими штрихами18. прописная буква19. титульный шрифтtwo line letter — прописная буква, помещающаяся на двух строках
20. латинский шрифт21. прямой шрифт22. антиква -
2 letter
1) буква, литера2) вытисненное название (на корешке книги) || вытиснять буквы или название (на корешке переплётной крышки)3) формат бумаги 25,4x40,6 см4) письмоАнгло-русский словарь по полиграфии и издательскому делу > letter
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3 letter
1. n полигр. литера2. n полигр. шрифтwhite letter — антиква, прямой латинский шрифт
3. n полигр. буква, шифр4. n полигр. буква, формальная сторонаletter for letter — дословно, точно
lowercase letter — строчная буква; знак нижнего регистра
bad letter — плохо отпечатанная буква, дефектная буква
5. v помечать буквами6. v надписывать чертёж7. v полигр. вытиснять буквы, заглавиеletter of the law — буква, формальный смысл закона
capital letter — прописная буква; заглавная буква
italic letter — курсивная буква; курсивный шрифт
8. v унив. заслужить право быть членом спортивной команды9. n сдатчик; квартиросдатчик; тот, кто сдаёт внаём или в арендуnewsy letter — письмо, в котором изложены все новости
Синонимический ряд:1. character (noun) character; rune; sign; symbol; type2. message (noun) communication; dispatch; epistle; memorandum; message; missive; note; report3. inscribe (verb) initial; inscribe; sign; stamp -
4 co-ordination
- координация (контакторов и пускателей) с устройствами защиты от короткого замыкания
координация (контакторов и пускателей) с устройствами защиты от короткого замыкания
-7.2.5 Координация с аппаратами защиты от коротких замыканий
7.2.5.1 Работоспособность в условиях короткого замыкания (номинальный условный ток короткого замыкания)
... Допускается координация двух типов — 1 или 2....
Координация типа 1 требует, чтобы в условиях короткого замыкания контактор или пускатель не создавали опасности для людей или оборудования, хотя они могут оказаться непригодными для дальнейшей эксплуатации без ремонта и замены частей.
Координация типа 2 требует, чтобы в условиях короткого замыкания контактор или пускатель не создавали опасности для людей или оборудования и оставались пригодными для дальнейшей эксплуатации. Возможность сваривания контактов допускается, и в этом случае изготовитель должен рекомендовать меры по обслуживанию аппаратов.
[ ГОСТ Р 50030.4.1-2002 (МЭК 60947-4-1-2000)]Параллельные тексты EN-RU
Co-ordination type 1 and type 2
The co-ordination typologies admitted by the Standard with reference to the behavior of the protection device against short-circuit towards the starter components are classified as “type 1” and “type 2”.
Under short-circuit conditions, the coordination of type “1” allows the contactor and the overload relay to be damaged; as a consequence they could not be able to operate without repairing or replacement of parts.
However, the Standard prescribes that these devices do not cause damages to people or installations, for example with parts of the components ejected outside the enclosure.
Under short-circuit conditions, the coordination of type “2” allows the risk of contact welding, provided that the contacts themselves can be easily separated (for example through a screwdriver) without important deformations.
This type of coordination requires that the contactor or the starter do not cause damages to people or installation and that they are able to resume operation after restoring of the standard conditions.
From the definition of the two coordination typologies it is possible to deduce how “type 1” coordination permits the use of devices of lower sizes, thus with an initial cost saving and reduced dimensions, but to the disadvantage of a high safety and however with subsequent costs for maintenance and replacement in case of faults.
“Type 2” coordination meets higher safety requirements and the possible greater initial cost can be amortized considering that, in case of fault, the switching and protection equipment could start operating again without being replaced.
[ABB]Координация типа 1 и 2 с аппаратами защиты от коротких замыканий
Стандарт определяет два типа координации компонентов пускателя с аппаратами защиты от короткого замыкания: тип 1 и тип 2.
Координация типа 1. В условиях короткого замыкания допускается повреждение контактора и теплового реле, в результате чего они могут оказаться непригодными для дальнейшей эксплуатации без ремонта и замены частей. При этом данные устройства не должны создавать опасности для людей и оборудования, например, вследствие вылета частей пускателя из оболочки.
Координация типа 2. В условиях короткого замыкания допускает сваривание контактов при условии, что они могут быть легко разъединены (например, отверткой) без заметной деформации. Контактор и тепловое реле не должны создавать опасности для людей и оборудования и должны оставаться пригодными для дальнейшей эксплуатации после восстановления нормальных условий.
Из определения двух типов координации можно сделать вывод, что координация типа 1 позволяет использовать устройства, рассчитанные на меньшие рабочие токи, обеспечивая таким образом экономию на первоначальных затратах и сокращение размеров устройств, но снижая при этом уровень безопасности и приводя впоследствии к расходам на техническое обслуживание и замену в случае возникновения неисправности.
Координация типа 2 отвечает более высоким требованиям безопасности и имеет большие первоначальные расходы, которые могут быть компенсированы тем, что в случае возникновения неисправности эксплуатация коммутационных и защитных аппаратов может быть продолжена без замены их частей.
[Перевод Интент]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > co-ordination
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5 allowance
1. сущ.1)а) эк. тр. содержание (денежное на определенный срок, напр., суточные); денежное пособие, денежная помощь; прибавка*, надбавка* (сумма, выплачиваемая в дополнение к обычному вознаграждению в качестве компенсации или поощрения; напр., надбавка к заработной плате за знание иностранных языков, надбавка к заработной плате за работу в неблагоприятных условиях и т. д.; также любые выплаты, призванные компенсировать расходы, понесенные данным лицом, напр., выплаты в счет покрытия транспортных расходов коммивояжера, выплаты работникам на приобретение спецодежды, командировочные и т. п.)He had a comfortable allowance from his father and would not have had to worry at all about money. — Он получал от отца достаточное денежное содержание и мог вовсе не беспокоится о деньгах.
See:attendance allowance, away from home allowance, Basic Allowance for Housing, Basic Allowance for Quarters, bereavement allowance, board allowance, burial allowance, carer allowance, carer's allowance, child care allowance, child disability allowance, children's allowance, clothing allowance, cost-of-living allowance, dearness allowance, decorating allowance, disability allowance, disability living allowance, Disability Working Allowance, dismissal allowance, education maintenance allowance, Emergency Maintenance Allowance, enterprise allowance, entertainment allowance 2), family allowance, family separation allowance, finish-out allowance, funeral allowance, guardian's allowance, hardship allowance, higher duties allowance, Hill Livestock Compensatory Allowance, hospitality allowance, housing allowance, injury allowance, installation allowance, Independent Circumstances Allowance, job search allowance, jobseeker's allowance, language allowance, living allowance, living away from home allowance, lodging allowance, maternity allowance, mature age allowance, mileage allowance 2), mobility allowance, newstart allowance, night duty allowance, northern allowance, on-call allowance, overtime allowance, paternity allowance, per diem allowance, pharmaceutical allowance, qualification allowance, reduced earnings allowance, relocation allowance, rent allowance, responsibility allowance, retention allowance, seniors concession allowance, severance allowance, severe disability allowance, severe disablement allowance, shift allowance, sickness allowance, special responsibility allowance, subsistence allowance, telephone allowance, temporary duty travel allowance, temporary lodging allowance, tenant improvement allowance, Trade Readjustment Allowance, training allowance, Training Incentive Allowance, travel allowance, uniform allowance, Variable Housing Allowance, weekend allowance, widowed mother's allowance, widowed parent's allowance, widow's allowance, youth allowance, basic payб) эк. карманные деньги; деньги на мелкие расходы (напр., школьника)в) мн., эк., воен. довольствие (продовольственное, вещевое и денежное снабжение военнослужащего)2)а) общ. рацион, порция; паек; норма отпуска, норма выдачи; квотаto put on short allowance — перевести на ограниченную норму, урезать норму
See:baggage allowance, carry-on allowance, entertainment allowance 1), free baggage allowance, hospitality allowance, lifetime allowance, mileage allowance 1), sick leave allowanceб) общ. норма времениSee:3) торг. скидка (вычет из фактурной стоимости товара, предоставляемый продавцом покупателю в случае быстрой оплаты товара, особых условий сделки (напр., обещание покупателя рекламировать товар) либо в случае, если товар был поставлен позже оговоренного срока или прибыл в поврежденном состоянии; термин обычно не распространяется на скидки с прейскурантной цены товара)tariff allowance — скидка с тарифа, тарифная скидка
Syn:deduction 2) б)See:advertising allowance, billback allowance, bill-back allowance, breakage allowance, buy-back allowance, buying allowance, case allowance, cooperative advertising allowance, damaged goods allowance, display allowance, distribution allowance, merchandise allowance, merchandising allowance, off-invoice allowance, price allowance, promotion allowance, promotional allowance, purchase allowance, retail display allowance, sales allowance, slotting allowance, trade allowance, trade-in allowance, discount 1. 1) а) invoice price, purchase returns and allowances, sales returns and allowances4) гос. фин. налоговая скидкаSyn:See:age allowance, allowance against tax, allowance for depletion, allowance for depreciation, amortization allowance, balancing allowance, capital allowance, capital cost allowance, capital gains tax allowance, capital recovery allowance, depletion allowance, depreciation allowance, first year allowance, income tax allowance, industrial-buildings allowance, initial allowance, investment allowance, investment tax allowance, married couple's allowance, personal allowance, wear and tear allowance, wife's earned income allowance, withholding allowance, writing down allowance5) общ. учет; допущение; поправка (напр., на погрешность измерительного прибора при измерении), принятие в расчет, во вниманиеSee:6)а) общ., редк. разрешение, допущение, позволение; легальностьб) эк., юр., пат. признание (обоснованным, законным и т. п., напр., решение предварительной экспертизы о патентоспособности)7) учет, фин. резерв (средства, зарезервированные для будущего покрытия запланированных расходов и компенсирования возможных убытков, напр., резерв под обесценение финансовых вложений, по сомнительным долгам и т. п.; также часть названия бухгалтерских счетов, предназначенных для отражения таких резервов)See:allowance for bad debts, allowance for borrowed funds used during construction, allowance for doubtful accounts, allowance for equity funds used during construction, allowance for funds during construction, allowance for funds used during construction, allowance for loan losses, allowance for uncollectible accounts, allowance for uncollectibles, bad debt allowance, loan loss allowance, valuation allowance, allowance method8)а) эк., тех. допуск, допустимое отклонение (напр., размера детали от нормы)See:б) учет допустимая потеря* (потеря количества или качества, рассматриваемая как нормальная для данного производства)2. гл.1) общ. ограничивать (кого-л.) строго определенным количеством; рационировать потреблениеI am allowanced two glasses three hours before dinner. — Мне разрешают выпить два бокала за три часа до ужина.
2) эк. назначать [выдавать\] паек, содержание и т. п.
* * *
1) налоговая скидка; 2) денежное содержание, командировочные, карманные деньги; 3) допущение; 4) резерв против плохих долгов; 5) резерв для корректировки стоимости актива, амортизации в бухгалтерском учете; 6) скидка с цены; 7) скидка со стоимости счета-фактуры, разрешенная продавцом-производителем товара для покрытия порчи или недостачи, а также расходов на маркетинг товара; см. brokerage allowance;* * *. . Словарь экономических терминов .* * *см. discount-----освобождаемая от налога сумма, которая вычитывается из налогооблагаемого дохода перед калькуляцией суммы налога -
6 by any cause, for any reason
Страхование: по любой причине (… non-appearance for any reason of the patient …… in case the property is damaged or destroyed by any cause.)Универсальный англо-русский словарь > by any cause, for any reason
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7 party
n1) участник2) юр. сторона
- accommodation party
- accredited party
- adverse party
- beneficiary party
- charter party
- claiming party
- complaining party
- conflicting parties
- contending parties
- contesting parties
- contracting parties
- cooperating parties
- credited party
- counter party
- damaged party
- defaulting party
- defeated party
- disputing parties
- dissatisfied party
- front party
- guilty party
- infringing party
- injured party
- interested party
- invoiced party
- negotiating parties
- opposing party
- opposite party
- prevailing party
- rescue party
- responsible party
- straw party
- third party
- unrelated parties
- working party
- party at fault
- parties in dispute
- party on a bill
- party to an agreement
- party to a bill
- party to a case
- party to a contract
- parties to negotiations
- parties to proceedings
- party to a suit
- party concerned
- party involved -
8 device
приспособление; механизм; устройство; установка; прибор; аппарат (см. также apparatus, instrument, mechanism); элемент; компонент; метод; методика; процедура; способ; план; проект; схема; эмблема; амер. значок- device capacity - device class - device complexity - device control character - device control register - device control unit - device coordinates - device cycle - device directory - device docking - device driver - device error message - device executive - device for all-range centrifugal regulator correction - device ID - device independent - device integration - device operating failures - device queue - device resolution - device stability - device status condition - device under test - activation device - alarm device - anticrash device - AND device - anti-dazzling device - anticollision device - anticreep device - antidive device - antijamming device - antijoy ride device - antipumping device - antiroll device - antirotation device - assembly feed device - automatic arm locking device - automatic tracking device - bit rotation device - breakaway device - breakaway safety device - breakout device - bridge device - bridging device - built-in diagnostic device - bucket-tipping device - casing-rotating device - catch device - catching device - center-locating device - central control device - chain-stretching device - chain-type leveling device - levelling device - changeover device - character display device - charging device - checking device - chip control device - chip flushing device - choice device - chuck jaw-changing device - chuck jaw-forming device - chuck location device - chucking device - circular milling device - clearance device - clearing device - clever device - clutch antirotation device - clutch-operating device - code device - coded automatic reader device - cold-start device - compensating device - complete device - compliance device - compliant device - computer access device - conditioning device - constant hydrostatic head device - constant tension device - constant torque device - contact device - contact sealing device - continuously variable adjustment device - control device - control-monitor device - control device controlling device - controlled device - controlled handling device - controlling device - conveying-loading device - coolant transfer device - copying device - correcting device - crane device - cross rail clamping device - current-collecting device - custom's device - cutoff device - cut-out device - cutter angle testing device - cutter-checking device - cutter-trueing device - damping device - data storage device - data-setting device - deburring device - deep hole tapping device - defective device - delta-connected device - density device - depth-measuring device - differential device - differential speed reduction device - digital measuring device - dimension monitoring device - directed beam display device - discrete output device - disengaging device - disk-type leveling device - display device - distance-measuring device - diverting device - dividing device - dragging device - dressing device - drilling device - drive device - driven device - driving roller device - duplicating device - edging device - educational device - electric control device - electromechanical locking device in case of rope failure - electronic storage device - emergency cutoff device - emergency-knockoff device - emergency release device - emergency stop device - emission control device - emptying device - end device device - end-finishing device - end-machining device - end-of-arm tooling safety device - energy storage device - error-detection device - error-sensing device - escapement device - estimation device - etching device - executive device - expandable holding device - external diagnostic device - external read-in device - fail-active device - fail-passive device - fail-safe device - failure-detection device - failure-indicating device - failure-sensing device - fastening device - fault-isolation device - fault-locating device - feed control device - feeding device - fifth-wheel device - finger-type leveling device - finger-type levelling device - fixed length stroke device - fixing device - fixturing device - flaw-detecting device - flotation device - flow control device - flow-diverting device - fluid logic device - four-arm device - fuel-metering device - fuel run-out warning device - functional switching device - galvanic device - gas discharge device - gas-partitioning device - go-no-go device - grabbing device - graphic input device - gravitational separating device - gravity device - gripping device - guard device - guide device - Hall device - Hall-effect device - handling device - hard-wired command-and-control device - hauling device - height-measuring device - height setting-and-measuring device - helical milling device - high-pressure cleaning device - hoisting device - hold-down device - hold-off device - holding device - holding down device - hole-locating device - homing device - honing device - hooking device - hopper-type loading device - hydraulic releasing device - hydraulic retaining device - hydraulically actuated retaining device - ignition device - in-line device - in-process gaging device - in-process storage device - indexing device - indicating device - indicator device - inertial energy-storage device - information-processing device - input device - input-output device - inspection device - insulation monitoring device - interference detection device - interlock device - interlocking device - isolating device - jarring device - jaw shift device - jet device - joint device - knock-off device - labour-saving device - latching device - laying device - lift device - lift device with insulating arm - lifting device - limiting device - linear measuring device - load-handling device - load safety device - load-unload device - loading device - loading-unloading device - locating device - locking device - long lateral device - long normal device - low-frequency galvanic device - lubricating device - M-code device - machine retaining device - machine-dedicated device - machining device - magnetic holding device - magnetic medium input device - magnetic release device - magnetic testing device - magnetizing device - make-and-break device - manual input device - marking device - master device - master locating device - matching device - material-handling device - materials-handling device - measuring device - mechanical switching device - mechanical system diagnostic device - mending device - metering device - metrology room device - microautomatic device - microfocused device - micrometric displacement device - microspacing device - minimum-current release device - miter-cutting device - mixing device - monitoring device - monostable device - motion translation device - movement position device - muffling device - multichannel analyzer device - multidigit display device - multipallet automatic pallet-changing device - multipart clamping device - multiple switching device - multipoint measuring device - night viewing device - noise-attenuating device - noise-eliminating device - nondeteriorating device - nonsynchronous loading device - normal device - normal logging device - numerical control device - nut-locking device - off-line device - offloading device - offtake device - oiling device - oleodynamic device - on-line device - operating device - operation-performing device - optical reading device - optical scanning device - optoelectronic device - OR device - orienting device - origin-shift device - output device - oval turning device - overcurrent release device - overload-detecting device - overload device - overload prevention device - overload-protection device - overload release device - overload safety device - override-idle economy device - pallet load-unload device - pallet locating-and-clamping device - pallet shuttle device - pallet transfer device - pallet transport device - part handling-and-storage device - part-marking device - part present device - part presentation device - part probing device - partitioning device - pen-equipped device - peripheral recording device - permanent insulation monitoring device - personal protective device - photoelectric device - photoelectric semiconductor device - photosensitive device - pick device - pick-and-place device - pickup device - pipe collapsing device - pipe-cutting device - pipe hoisting device - pipe makeup and breakout automatic device - pipe-shearing device - pipe stabber device - pit level device - plotting device - plug-in device - plugging device - pointer device - pointer-type device - pointing device - poligon-cutting device - polyphase device - polyphase electrical device - porosity-estimating device - porosity-sensitive device - position control device - positioning device - power-assisted clamping device - power chucking device - preselector device - presence sensing device - pressure abnormal fall detecting device - pressure-difference device - pressure fall preventing device - pressure-sensing device - primary device - printing device - probe control device - probe-changing device - probing device - process-monitoring device - profiling device - program transfer device - programmable device - programmable wheel trueing device - projection optical device - propulsion device - propulsive device - protecting device - protective device - puller device - pulling device - pushing device - radial stretching device - radius planing device - radius trueing device - rail-clamping device - rail-setting device - ratchet device - ratcheting device - reading device - readout device - ready-not-ready device - reclosing device - recognition device - recording device - redundancy device - redundant device - regulating device - regulator device - relay device - releasing device - relief device - relieving device - remote maintenance device - repairable device - resetting device - resistivity measuring device - resolver position measuring device - rest device - restraint device - retaining device - retrieval device - return spring device - reverse-current release device - reverse-thrust device - reversing device - right-angle orientating device - robot device - robot-like device - robot load-unload device - robot part-handling device - robotic device - robotic inspection device - robotic loading device - rocking device - roll feed device - rotary machining device - rotary power-torque device - rotating device - sand-spraying device - safety device - safety alarm device - safety control device - safety interlock device - safety locking device - safety slipping device - sampling device - scanning device - scraping device - screening device - screw copying device - screw locking device - sealing device - search device - searching device - securing device - seed-feeding device - sowing device - seed-sowing device - self-balancing device - self-diagnosis device - self-gripping device - self-healing device - self-leveling device - self-levelling device - self-reacting device - self-repair device - semiautomatic device - semiconductor device - semiconductor display device - semiconductor power device - semiconductor switching device - sending device - sensing device - sensing-switching device - sensor device - separation device - serial device - setting device - shaker device - shearing device - short normal device - short-time memory device - shut-down device - shut-off device - shuting-off device - sighting device - signal device - signaling device - single-lever locking device - single-phase device - single-phase electrical device - single-pole switching device - sizing device - skew-compensating device - slitter device - slowing-down device - smart device - smart power device - snap-action switching device - sonic device - sound emitting device - special machine retaining device - speed reduction device - speed-limit device - speed-limiting device - speed-sensing device - spindle-keylock device - spindle-keylocking device - spinning device - spiral milling device - split clamping device - spooling device - spraying device - spreading device - spring balancing device - squelch device - stall warning device - star-connected device - starting device - static switching device - steadying device - steering device - stirring device - stocking device - stop device - stopper-rod device - stopping device - storage device - stretching device - strip-off device - stroke device - surface-mounted device - swing arm device - swirling device - switch device - switching device - switch-type sensing device - switching-off device - table-tilting device - tactile sensing device - take-up device - taper-turning device - tapping device - tea-leaf harvesting device - picking device - telechiric device - telemetering device - tensioner device - tensioning device - testing device - thermal release device - thermoelectric device - three-axis sensing device - three-dimensional sensing device - three-linear axis device - thrust-vectoring device - tightening device - tilting device - time-cycling device - time-delay device - tipping device - tool-changing device - tool-checking device - tool feed control device - tool-guiding device - tool life control device - tool-loading device - tool-pregaging device - tool-presetting device - tool-setting device - tool storage device - toolholder-changing device - toolholding device - torque release device - tracing device - transfer device - trip-free mechanical switching device - tripping device - trouble-location device - trouble-shooting device - trueing device - trunnion device - tube end finishing device - tube-cutting device - tube-trimming device - turnaround device - turnover device - twin-pallet rotating device - two-axis sensing device - ultrasonic proximity device - universal machine retaining device - upsetting device - unwinding device - variable gain device - variable speed device - vector-measuring device - visible light emission device - warning device - washing device - water suction device - waveguide protection device - wear-sensing device - weighting device - wheel-trueing device - withdrawing device - work recognition device - work rest device - work-staging device - work transfer device - workhandling device - workholding device - workpiece holddown device - workpiece-sensing device - workpiece support device - worm-type leveling device - zero-resetting device - zero-setting device -
9 courant admissible, m
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Франко-русский словарь нормативно-технической терминологии > courant admissible, m
-
10 courant permanent admissible, m
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Франко-русский словарь нормативно-технической терминологии > courant permanent admissible, m
-
11 Dauerstrombelastbarkeit, f
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Немецко-русский словарь нормативно-технической терминологии > Dauerstrombelastbarkeit, f
-
12 Strombelastbarkeit, f
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Немецко-русский словарь нормативно-технической терминологии > Strombelastbarkeit, f
-
13 continuous current-carrying capacity
длительная пропускная способность по току
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Англо-русский словарь нормативно-технической терминологии > continuous current-carrying capacity
-
14 ampacity (US)
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Англо-русский словарь нормативно-технической терминологии > ampacity (US)
-
15 continuous current
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
непрерывный ток
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999]Тематики
- электротехника, основные понятия
EN
Англо-русский словарь нормативно-технической терминологии > continuous current
-
16 current-carrying capacity
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
предельно допустимый ток
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
прочность печатной платы к токовой нагрузке
Свойство печатной платы сохранять электрические и механические характеристики после воздействия максимально допустимой токовой нагрузки на печатный проводник или металлизированное отверстие печатной платы.
[ ГОСТ Р 53386-2009]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > current-carrying capacity
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