-
21 длительный допустимый ток
- courant permanent admissible, m
- 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
Русско-французский словарь нормативно-технической терминологии > длительный допустимый ток
-
22 клемма
1) General subject: terminal2) Aviation: terminal block3) Medicine: approximating forceps, approximating magazine, fastener4) Engineering: binder post, binding post, clamping arrangement, cleat, clip, connection terminal, lead terminal (контактный), post5) Chemistry: clamp6) Construction: connecting terminal, electric terminal, terminal clamp, wire clamp7) Railway term: connecting screw, connection screw, contact device, grip, wiring terminal9) Metallurgy: Electric panel rivet10) Telecommunications: contact terminal11) Astronautics: connector, pin, (контрольная) test jack12) Mechanic engineering: cleet13) Arms production: snap14) Sakhalin A: cable gland15) Electrochemistry: limb16) oil&gas: tulip17) Printed circuits: header -
23 монтажный стол
1) Engineering: bench, mounting table, wiring table2) Cinema: cutting table, editing device, editing machine, editing table, editor, splicing table3) Polygraphy: cutting bench, glass flat, illuminated table, layout board, layout table, light table, lineup table, paste-up table, register and line-up table, shining-up table4) TV: editing block, splicing block5) Cartography: film-numbering table6) Advertising: flat7) Automation: staging table8) Makarov: stripping table9) Electrical engineering: wire table -
24 противоместная схема
antisidetone device тлф., antisidetone circuit, sidetone suppression circuit, sidetone control, sidetone reduction wiringРусско-английский словарь по электронике > противоместная схема
-
25 противоместная схема
antisidetone device тлф., antisidetone circuit, sidetone suppression circuit, sidetone control, sidetone reduction wiringРусско-английский словарь по радиоэлектронике > противоместная схема
-
26 механизм подачи карт
1. card feedапертурная, просветная, микрофильмовая карта — aperture card
2. card feed deviceмонтажная карта; карта монтажных соединений — wiring card
подача карт; ввод карт; механизм подачи карт — card feed
Русско-английский большой базовый словарь > механизм подачи карт
-
27 контровка
locking device
(контровочная деталь и устройство)
приспособление против самоотворачивания болтов, винтов и гаек. — each bolt, screw, nut, pin, or other fastener whose loss could jeopardize the safe operation incorporate two separate locking devices.
- (операция) — locking
- (рабочей) лопатки, пластинчатая (деталь) — blade retaining plate
- (рабочей) лопатки, шпоночная (деталь) — blade retaining /locking/ key
- (рабочей) лопатки, штифтовая — blade retaining pin
- проволокой — safety wiring
- шплинтом проверять на наличие (отсутствие) к. — cotterpinning check for presence (absence) of locking devicesРусско-английский сборник авиационно-технических терминов > контровка
-
28 ток
current
движение элеронов по проводнику. измеряется в амперах и обозначается буквой i. — the movement of electrons through а conductor. measured in amperes,and ist symbol is i.
- (нагрузка) — load
- автостабилизации — autostabilization current
-, большой — high current
-, вихревой — eddy current(s)
also called foucault currents, inducted in body.
- включения (реле) — (relay) pickup current
- выключения (реле) — (relay) dropout /tripping/ current
- высокого напряжения (в оборудовании) — high-voltage current
- высокого напряжения (в системе зажигания) — high-tension (нт) current
- высокой частоты — high-frequency (hf) current
- датчиха момента акселерометра — torque current. a torque current being а measure of the restoring torque.
-, двухфазный — two-phase current
-, зарядный (аккумулятора) — (battery) charge current
monitor dc ammeter for normal charge current on battery.
-, малый (слабый) — low current
- нагрузки — load current
- нагрузки (разрядки) аккумулятора, элемента — (battery) drain. current supplied by a battery or cell.
-, обратный — reverse current
-, отпускания (реле) — dropout current
- отрыва (реле,прерывателя) — dropout current
-, переменный — alternating current (ас), (ac)
электрический ток, периодически изменяющийся по силе и направлению, т.е. достигающий макс. значения в одном направлении, затем падающий до нуля, и снова достигающий макс. значения, но в противоположном направлении. — а flow of electricity which reaches maximum in one direetion, decreases to zero, then reverses itself and reaches maximum in the opposite direction. the cycle is repeated continuously.
-, постоянный — direct current (do),(dc)
эл. ток, не изменяющийся ни по силе, ни по направлению. — an essentially constant-value current that flows in only one direction.
-, потребляемый — current drawn /consumed/
-, потребляемый (параметр в технических данных, таблице) — current, current requirements
-, потребляемый к-л. нагрузкой — current drawn /consumed, taken/ by а load
- потребляемый от источника питания — current drawn (consumed, taken from power source, power source drain
-, пусковой — starting current
-, рабочий — operating current
-, разрядный (акк.) — discharge current, drain
- расходуемый источником питания — power source drain
-, световой — light-inducted current
ток, возникающий в датчике под воздействием светового потока.
- срабатывания реле — relay operating current
- срабатывания реле (в отличие от тока отпускания) — relay pickup current
-, трехфазный — three-phase current
ток, поступающий по трем проводникам, каждый являющийся обратным проводом для двух других. — а current delivered through three wires - each wire serving as the return for the other two.
-, трогания — pickup current
ток, вызывающий срабатывание электромагнитных устройств. — the current at which a magnetically-operated device starts to operate.
- удержания (реле) — holding current
sufficient current in the relay winding to keep the relay energized.
- утечки — leakage current
-, электрический — electric current
магнитные поля, создаваемые электротоком. агрегат переменного (постаянного) тока (напр., генератор) — magnetic fields created by electric currents. ас (dc) unit, ас (dc) generator
измеритель тока (нагрузки) — loadmeter
под т. — energized
не отсоединять проводки, если цепь находится под током (напряжением) — do not disconnect wiring when the system is energized.
под током (напряжением) — alive
генератор под током, напряжением. — generator is alive.
включать т. — switch on current
при включении тока автостабилизации, якорь соленоида вызывает срабатывание клапана. — а solenoid, when the autostabilization current is switched on, pushes the central armature against a valve.
держать под т. — energize, keep energized
do not energize the solenoid for more than 10 sec.
работать на переменном (постоянном) т. — be ас (dc) powered
работать на переменном т. частотой... гц и напряжением...вольт — operate at а supply of... hz,... volts ас, be powered by... hz, volt ас
работать на постоянном т. напряжением... вольт — operate at а supply of... volts dc, be powered by... volt dcРусско-английский сборник авиационно-технических терминов > ток
-
29 фидер
feeder
участок сети, отходящий от распределительного ус-ва (шины) и питающий один или группу потребителей через один аппарат защиты (рис. 91). — a conductor connecting а distribution bus to one or group of circuits via а circuit protection device.
- антенны — antenna feeder
-, вспомогательный — feeder
- распределения нагрузок — load distribution feeder
система распределения нагрузок включает распределительные шины и соответствующие фидеры. — distribution system includes distribution busses and their associated feeders.
- сети освещения — lighting circuit feeder
-, удлинительный альбом фидерных схем (афс) — extension feeder wiring diagram manualРусско-английский сборник авиационно-технических терминов > фидер
-
30 ремонт
ремонт агрегатный — unit repair, repair by replacement of unitsремонт восстановительный — complete renovation, overhaulремонт заводской — factory overhaul, works overhaulремонт капитальный — major repair, (heavy) overhaulремонт конструкций и монтажа прибора... (заголовок) — repair of components and wiring of device...▪ Selection of the proper solder is the next step required for trouble-free repair.ремонт планово-предупредительный — preventive maintenance, planned maintenanceремонт профилактический — preventive maintenance, preventive repairремонт скоростной — high-speed repair, rapid repairремонт текущий — running repair, routine repair, routine maintenanceпроизводить (выполнять) ремонт — to perform repairs, to make repairs▪ In extreme cold even shop maintenance cannot be completed with normal speed, because the equipment must be allowed to thaw out and warm up before the mechanic can make satisfactory repairsРемонт типовых деталей, соединений и сборочных единиц — Repair of Standard Parts, Connections and UnitsПоставки машин и оборудования. Русско-английский словарь > ремонт
- 1
- 2
См. также в других словарях:
wiring — ► NOUN ▪ a system of wires providing electric circuits for a device or building … English terms dictionary
Wiring diagrams — A circuit diagram (also known as an electrical diagram, wiring diagram, elementary diagram, or electronic schematic) is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as… … Wikipedia
wiring — wir·ing || waɪərɪŋ n. connection or system of wires carrying electricity waɪə(r) n. metal strand, cord, line; string; barbed wire, wire fence; telegraph cable; telegram; telegraphic system; electronic listening device, wire tapping device… … English contemporary dictionary
wiring diagram — noun A schematic representation of the components of an electrical device showing how electrical wiring must be connected … Wiktionary
wiring diagram — noun a schematic drawing of the wiring of an electrical system • Hypernyms: ↑schematic, ↑schematic drawing * * * noun : a line drawing showing how the electrical connections of a device are made … Useful english dictionary
wiring — noun 1》 a system of wires providing electric circuits for a device or building. 2》 informal the connections of the nervous system or brain, especially as determining behaviour … English new terms dictionary
Electrical wiring (UK) — The modern UK standards and regulations for electrical wiring no longer differ substantially from those in other European countries. However, there are a number of noteworthy national peculiarities, habits and traditions associated with domestic… … Wikipedia
Network interface device — In telecommunications, a Network Interface Device (NID) is a device that serves as the demarcation point between the carrier s local loop and the customer s premises wiring. Generically, an NID may also be called a Network Interface Unit (NIU),… … Wikipedia
Residual-current device — A two pole residual current device A Residual Current Device is a generic term covering both RCCBs and RCBOs. A Residual Current Circuit Breaker (RCCB) is an electrical wiring device that disconnects a circuit whenever it detects that the… … Wikipedia
Electrical wiring (United States) — Electrical wiring in general refers to conductors used to carry electricity and their accessories. General aspects of electrical wiring as used to provide power in or to buildings and structures, commonly referred to as building wiring, are… … Wikipedia
Knob and tube wiring — (sometimes abbreviated K T) was an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s. [Terrell Croft and Wilford Summers (ed), American Electricans Handbook, Eleventh Edition … Wikipedia