-
1 maximum flow condition
3.5 режим максимального расхода (maximum flow condition): Присущие конструкции параметры, заданные изготовителем, которые определяют максимальный расход.
Примечание - К этим параметрам могут относиться минимальная длина шланга подачи сжатого воздуха, внутренний диаметр шланга и давление в линии нагнетания.
Англо-русский словарь нормативно-технической терминологии > maximum flow condition
-
2 condition
1) положение; ситуация2) условие || обусловливать, ставить условие3) состояние || приводить в определённое состояние4) кондиция || кондиционировать5) pl обстановка, условия; режим•on condition that — при условии, что
under conditions of a problem — матем. по условиям задачи
to satisfy a condition — мат. удовлетворять условию
-
3 condition
1) условие
2) ситуация
3) обусловленность
4) положение
5) режим
6) состояние
7) режимный
8) обстановка
– abnormal condition
– annihilator condition
– as ahe condition may demand
– as cast condition
– as-delivered condition
– as-deposited condition
– as-rolled condition
– as-welded condition
– boiling condition
– boundary condition
– busy condition
– chain condition
– Chapman-Jouguet condition
– cold-worked condition
– condition pulp
– condition water
– continuity condition
– cooking condition
– corner condition
– degraded condition
– dented condition
– design condition
– distinguishable condition
– equilibrium condition
– flame condition
– flow condition
– free condition
– high-altitude condition
– hold condition
– initial condition
– limiting condition
– maximality condition
– maximum condition
– minimality condition
– minimum condition
– necessary condition
– no-current condition
– no-signal condition
– non-tangency condition
– normality condition
– off-design condition
– open condition
– operable condition
– operating condition
– operation condition
– orthogonality condition
– race condition
– receive condition
– remove condition
– reset condition
– resonance condition
– satisfy condition
– service condition
– shutdown condition
– side condition
– sine condition
– small-signal condition
– steam condition
– sufficient condition
– temperature condition
– test condition
– transient condition
– transmit condition
– turn on condition
– under condition
– under the condition
– unsteady condition
– violate condition
– Von Neumann condition
ascending chain condition — условие обрыва возрастающих цепей, условие максимальности
descending chain condition — <math.> условие минимальности, условие обрыва убывающей цепочки
reduction to reference condition — приведение к заданным условиям
-
4 condition
1. условие2. состояние; положение; обстановка3. режимcondition for a nontrivial solutioncondition of optimality1-g condition20-deg angle-of-attack conditionaim conditionsairworthy conditionaltitude conditionapproach conditionsasymmetric wing sweep conditionsaustere conditionsbegin cruise conditionsbelow-stall conditionbest-range conditionsboundary conditionscaution conditionsceiling conditionsCFL conditionclimb conditioncontinuity conditionCourant-Friedrichs-Levi conditioncrossflow conditionscruise conditioncruise conditionsday conditionsdeep-stalled conditiondeparture conditionsDirichlet conditiondisplacement boundary conditionsdivergence conditiondivergent conditiondutch roll conditionelevator-free conditionengine-out conditionenvironmental conditionequilibrium conditionfailure conditionsfar-field boundary conditionfatigue conditionfinal conditionsflexural conditionsflight conditionflight conditionsflow conditionsflow tangency conditionflutter conditionsflutter onset conditionsflyaway conditionfoggy conditionsforce boundary conditionsfree-flight conditionfree-free boundary conditionsfreestream conditionfreestream conditionsfull-down conditionfull-scale conditionshigh conditionshigh-angle-of-attack conditionshigh-maneuver-lift conditionshigh-drag conditionhigh-g conditionshot conditionshover conditionhover-flight conditionicing conditionsinitial steady-flight conditionsinstrument conditionsinstrument meteorological conditionsKuhn-Tucker conditionsKutta conditionKutta-Zhukowsky conditionlanding conditionlanding conditionslaunch conditionslift conditionlift-equal-to-weight conditionlighting conditionslightning conditionslimit conditionload conditionsloading conditionslongitudinally trimmed conditionlow-angle-of-attack conditionslow-visibility conditionslow-light conditionslow-speed conditionsmaneuver conditionmaneuver entry conditionsmaneuvering conditionmaximum endurance conditionsmeteorological conditionsminimum drag conditionmission abort conditionsnear-field boundary conditionsNeumann boundary conditionneutral backside conditionno-slip conditionno-wind conditionsno-windshear conditionnonmaneuver conditionsnonpowered-lift conditionoff-design conditionsoff-nominal conditionsomega conditionoperating conditionoperational conditionoptimality conditionoscillatory conditionout-of-balance conditionout-of-trim conditionoverheat conditionoverload conditionsovertemperature conditionperiodicity conditionpost-stall conditionpostcrash conditionspowered-lift conditionpre-stall conditionpull-up conditionquasi-steady-state conditionRankine-Hugoniot conditionsresonant conditionrestraint conditionsrotating conditionsscaling conditionsea-level conditionsshock-on-lip conditionsimulator conditionssliding conditionslip conditionslow flight conditionsstalled conditionstalled conditionssteady-state conditionSTOL conditionsstraight-and-level conditionsstress conditionsubcritical conditionssupercritical conditionsupersonic conditionssupersonic leading-edge conditionsupport conditionssystem-off conditiontailwind conditionstakeoff conditionstask conditionstemperature jump conditionterminal conditiontip conditionstransient conditiontransonic conditiontranspiration conditiontransversality conditionTresca`s yield conditiontrim conditiontrimmed conditiontropical day conditionsunaugmented flutter conditionunstable conditionviewing conditionsvisibility conditionsvisual contact conditionswake conditionswashout conditionweather conditionswind conditionswind shear conditionswing-leveled conditionwing rock conditionwings-level conditionworking conditionszero-wind conditions -
5 regime
-
6 time
время; период; продолжительность || устанавливать время; распределять время; рассчитывать по времени; согласовывать во времени; синхронизироватьtime in use — время использования; время работы (напр. инструмента)
time on machine — время пребывания ( обрабатываемой детали) на станке
- acceleration timeto cut time — сокращать время (напр. обработки)
- access time
- activation time
- active maintenance time
- active repair time
- activity time
- actual in-cut time
- addition time
- additional time
- adjustable laser ramp-up time
- administrative time
- aggregate travel time
- air-cutting time
- arcing time of pole
- assembly time
- assessed mean time to failure
- ATC time
- attended running time
- attenuation time
- auxiliary time
- available machine time
- available machining time
- available time
- average access time
- average time
- base cycle time
- batch change time
- batch lead time
- batch run time
- block execution time
- block processing time
- bounce time
- braking time to standstill
- braking time
- break time
- breakdown time
- bridging time
- build time
- build-up time
- cam idle time
- cell production time
- changeover cut-to-cut time
- changeover time
- characteristic time
- charge time
- chip-cutting time
- chip-making time
- chip-to-chip toolchange time
- clock cycle time
- closing time
- combined travel/load time
- commissioning time
- component cycle time
- component inspection time
- component time
- computed machine time
- computing time
- control flow time
- control time
- conversion time
- correction time
- corrective maintenance time
- c-percentile storageability time
- c-percentile time to failure
- cumulative cutting time
- cure time
- current fall time
- current rise time
- cut time
- cutting time
- cut-to-cut time
- cycle time
- dead cycle time
- dead time
- debugging time
- delay time
- delivery time
- depalletizing time
- derivative action time
- derricking time
- detection time
- direct manufacture time
- disengaging time
- division time
- door-to-door time
- double-stroke time
- down time
- dry-cycle time
- dwell time
- effective cutting time
- effective dead time
- empty running time
- end-of-job time
- equispaced times
- equivalent running time for wear
- eroding time
- erosion time
- estimation time
- execution time
- exposure time
- fall time
- fast response time
- finishing time
- first-off machining time
- fitting time
- fixture lead time
- floor-to-floor time
- flow time
- forward recovery time
- frame time
- full brazing time
- full operating time
- full soldering time
- gate controlled turn-off delay time
- gate controlled turn-off fall time
- gate controlled turn-off time
- grinding time
- gripper-changing time
- head-changing time
- hobbing time
- holding time
- idle time
- index time
- indexing time
- innovation time
- in-process time
- integral action time
- interarrival time
- interoperation time
- interpolation delay time
- jaw-adjusting time
- job completion time
- job finish time
- laser interaction time
- laser shutter opening time
- laser weld tempering time
- laser-beam dwell time
- laser-beam interaction time
- lead time
- learning time
- loading time
- machine down time
- machine repair time
- machine run time
- machine slack time
- machine wait time
- machine-setting time
- machine-setup time
- machining floor-to-floor time
- machining time
- machining-cycle time
- maintenance down time
- maintenance time
- make time
- manual machining time
- manufacturing cycle time
- manufacturing lead time
- material to end product lead time
- maximum resetting time
- mean time between failures
- mean time to failure
- mean time to repair
- measuring run time
- metal-to-metal time
- minimum accelerating time
- minimum braking time
- move time
- moving time
- multiplication time
- NC machining time
- NC program debug time
- no-failure operating time
- noncut time
- noncutting time
- nonmachining time
- nonproductive machine time
- nonrequired time
- numerical processing time
- observed mean time to failure
- off-machine process time
- off-shift machine down time
- off-shift slack time
- opening time
- operate time
- operating spindle time
- operating time
- operation cycle time
- operation time
- operator's attention time
- operator's reaction time
- operator's time
- optimized contact time
- out-of-cut machine time
- out-of-cut time
- output cycle time
- overall cycle time
- overall lead time
- pallet change time
- pallet processing time
- pallet shuttle time
- parasitic time
- part turnaround time
- partial operating time
- part-waiting time
- payback time
- periodic time
- pickup time
- piece sequence time
- piece time
- planned loading time
- planning lead time
- planning time
- predicted mean time to failure
- preparatory time
- preset operating time before corrective adjustment
- preset operating time
- preset time
- probing time
- process response time
- process time
- processing time
- product development lead time
- product flow time
- product lead time
- production lead time
- production time per piece
- production time per unit
- production time
- productive time
- profiling time
- programming time
- prorated time
- protective power time
- pulse decay time
- pulse response time
- pulse rise time
- pulse time
- queue time
- queueing time
- rapid response time
- reading time
- readout time
- real time
- rechucking time
- recognition time
- recovery time
- release time
- releasing time
- remaining life time
- repair/down cost time
- required time
- reset time
- residence time of materials
- response time
- restoration time
- return time
- reverse recovery current fall time
- reverse recovery current rise time
- reverse recovery time
- rise time
- robot down time
- roughing time
- run time
- running time
- running-in time
- safety lead time
- sampling time
- scan time
- schedule time
- scheduled time
- sensing time
- series machining time
- service time of the tool
- servicing time
- servo update time
- setter time
- setting time
- settling time
- setup time
- ship time
- slack time
- soaking time
- software execution time
- specified no-failure operating time
- specified operating time
- specified time
- spindle cutting time
- spindle run time
- stabilization time
- stand time
- standard handling time
- standard piece time
- starting time
- start-up time
- station time
- station-to-station time
- step response time
- stopping time
- storage cycle time
- storage time
- storageability time
- switching time
- switch-over time
- system time
- table-indexing time
- tape-preparation time
- tape-turnaround time
- target build time
- target time
- teach time
- throughput time
- time of starting
- tool change time
- tool exchange time
- tool index time
- tool life time
- tool-cutting time
- tool-in-cut time
- tooling-response time
- tool-setup time
- tool-to-tool changing time
- total access time
- total changeover time
- total equivalent running time for strength
- total equivalent running time for wear
- total manufacturing cycle time
- total running time
- total sequence time
- to-the-minute time
- transfer time
- transient time
- transit time
- transition time
- traveling time
- turnaround time
- turn-off time
- turn-on time
- undetected failure time
- unit cycle time
- unit production time
- unit time
- up time
- update time
- updating time
- vehicle time per hour
- vehicle-use time
- waiting time
- wakeup time
- warm-up time
- wasted time
- work-change time
- work-cycle time
- work-in-process time
- wrench time
- zero ATC timeEnglish-Russian dictionary of mechanical engineering and automation > time
-
7 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
-
8 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)
-
9 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
-
10 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
-
11 test
1) замер2) испытание; испытания || испытывать; исследовать3) стат. критерий4) обнаружение; определение5) опробывание6) опыт; эксперимент7) признак8) проба || пробовать9) проверка || проверять10) тест || тестовый11) пробный•test for uniformity — мат. критерий равномерности
test for trend — мат. проверка на тренд
test for singularity — мат. критерий особенности
test for regression — мат. проверка на наличие регрессии
test for randomness — мат. критерий случайности
test for primality — мат. признак простоты (числа)
test for optimality — мат. критерий оптимальности
test for nonadditivity — мат. признак неаддитивности
test for minimum — мат. проверка на минимум
test for interaction — мат. критерий взаимодействия
test for exponentiality — мат. критерий экспоненциальности
test for ergodicity — мат. критерий эргодичности
test for divisibility — мат. признак делимости
test for definiteness — мат. критерий определённости
test for convergence — мат. критерий сходимости
test for concordance — мат. критерий согласия
test for casualty — мат. критерий обусловленности
- asymptotically efficient test - asymptotically minimax test - asymptotically most powerful rank test - asymptotically optimum test - asymptotically robust test - asymptotically unbiased test - double-tailed testto make test — стат. строить критерий (напр., для проверки значимости отклонений)
- fat test- general test for homogeneity- jet test- locally unbiased test - multiple comparison test - multiple ranking test - normal scores test - one-tailed test - probability ratio test - process normality test - single-tailed test - statistically valid test - test for goodness of fit - test for homogeneity of means - test for homogeneity of variances - test for nonsphericalness of disturbances - test for significant changes - test for uniform convergence - test hypothesis with experiment - uniformly asymptotically efficient test - uniformly best test - uniformly consistent test -
12 test
испытание; исследование; опыт, проба; проверка; обнаружение; определение; показатель пробы; характеристика продукта (результат пробы); II испытывать; подвергать испытанию; пробовать; исследовать; делать опыты- test bar- test bed- test by bending and unbending- test car- test conditions - test cubicle - test facilities - test fan - test figures - test for durability - test for ground - test for parallelism - test for short - test gauge - test glass - test hause - test lamp - test method - test miles per day - test mixer - test period - test pick - test pressure - test prod - test pulse - test results- test rig- test-room- test run- test to destruction - test tunnel - test unit - test vehicle - test work- air test- break down test - color test - crash test - exaggerated test - exhaustive test - exposure test - heavy duty test - hill climbing test- hot test- odd test- oil-immersion test - paint rub test - palm test - percentage test - percussion test - performance test - periodic test - physical test - pitting corrosion test - plasticity test - porosity test - pour test - pouring test - preliminaryt test - pressure test - production test - production typical test - programme test - proof test - protracted test - psychotechnic test - pull test - pulling test - punching test - qualification test - quality test - quantitative test - quick test - rebound hardness test - reception test - recovery test - red-heat test - repair test - repeated test - repeated bending stress test - repeated compression test - repeated direct stress test - repeated dynamic stress test - repeated impact test - repeated impact tension test - repeated stress test - repeated tensile stress test - repeated tension test - repeated torsion test - repetition test - replicated field test - resilience test - retardation test - reverse bend test - rig test - rigid test - road test - roll-over test - rolling acceleration test - rotating bar fatigue test - rotating beam fatigue test - rough test - rough-track test - routine test - running test - rupture test - safety test - scratch test - scratch oil test - screening test - scuffing test - separation test - service test - shake test - shock test - short-circuit test - short-time test - simulated test - single test - skid test - skid pad test - roadability test - slow-speed test - small-scale test - soil test - sonic test - standard distillation test - starting test - static test - static torsional test - steering test - step test - stiffness test - stop-and-go test - stop-start test - stopping and starting test - stroking test - structure test - tactical test - tensile and compression test - tensile fatigue test - test tensile impact test - tensile shock test - thermal test - tilting test - torque test - torsion test - torsion impact test - toughness test - towing test - transverse test - transverse bending test - trial test - triaxial compression test - twisting test - type test - ultrasonic test - understandability test - underwater test - vehicle drag test - vehicle road test - vibration test - vibratory test - visibility test - volatility test - warpage test - warranty test - water test - water-absorption test - water-resistance test - wear test - wearing test - weather-exposure test - weather-resistance test - weathering test - wheel test - whirling test - wind-tunnel test -
13 environment
окружающая среда; внешние [окружающие] условия; внешние факторы или воздействия; обстановка; условия эксплуатации (ЛА) ; см. тж. conditionMach-3 environment — условия полёта при числе М=3
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