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1 уточнять сумму
Banks. Exchanges. Accounting. (Russian-English) > уточнять сумму
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2 длительный допустимый ток
(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-английский словарь нормативно-технической терминологии > длительный допустимый ток
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3 размер
size, gage, magnitude, measurement, quantity* * *разме́р м.1. (величина, выражаемая в метрах или единицах, кратных ему) dimensionвыде́рживать разме́ры загото́вки прок. — hold the billet to dimensionsвыде́рживать разме́ры с, напр. высо́кой то́чностью — hold dimensions to, e. g., a high degree of accuracyназнача́ть разме́ры — specify the dimensionsназнача́ть разме́ры ( в пропорции от другого размера) — proportionвысоту́ а́рки сле́дует назнача́ть в отноше́нии [пропо́рции] 1/ [m2]80 от её́ пролё́та — the rise of the arch should be proportioned to be 1/ 80 of the spanнаноси́ть разме́ры на чертё́ж — dimension a drawingустана́вливать разме́ры с указа́нием преде́лов — qualify the dimensions (of a part) with limits2. (безразмерная или условная величина; признак классификации по величине; номер обуви, одежды и т. п.) sizeбыть разме́ром с … — be the size of …блок разме́ром со спи́чечный коробо́к — a unit (which is) the size of a matchboxкрои́ть, ре́зать и т. п. по разме́ру — cut, etc. to sizeназнача́ть разме́р — specify the sizeне по разме́ру — off-sizeобраба́тывать (то́чно) по разме́ру — machine to sizeразме́р в свету́ — clear [inner] dimensionразме́р вы́борки стат. — sample sizeгабари́тный разме́р — overall dimensionгабари́тные разме́ры, напр. генера́тора составля́ют 180 e 180 1 17 мм — the generator is [measures] 180 180 17 mm overall, the dimensions of the generator are 180 180 17 mm overallразме́р едини́цы ( физической величины) — size of a unitразме́р зерна́ — grain sizeкрити́ческие разме́ры — critical sizeлине́йный разме́р — linear dimensionлине́йный, определя́ющий разме́р хим. — characteristic lengthмодуля́рный разме́р — modular dimensionмонта́жный разме́р — fixing dimensionномина́льный разме́р — nominal [basic] sizeразме́р па́мяти, отводи́мый (напр. набору данных) — the amount of storage allocated to a data setразме́р пе́чи — (furnace) sizeразме́р пиломатериа́ла, номина́льный — rated lumber sizeразме́р пиломатериа́ла, факти́ческий — actual lumber sizeразме́р под ключ — width across flatsразме́р попере́чного сече́ния — cross-sectional dimensionразме́р по полноте́ кож. — width sizeпреде́льный разме́р — limit of size, limitпреде́льный, наибо́льший разме́р — the maximum limit of a dimensionпреде́льный, наиме́ньший разме́р — the minimum limit of a dimensionпредпочти́тельный разме́р — preferred sizeприсоедини́тельный разме́р — mounting dimensionремо́нтный разме́р — repair sizeсвобо́дный разме́р — free [non-mating] dimensionсопряжё́нный разме́р — mating dimensionстанда́ртный разме́р — standard sizeустано́вочные разме́ры — mounting dimensionsразме́р части́ц — particle sizeразме́р шва — weld sizeразме́р яче́йки си́та — mesh dimension, screen size* * * -
4 означать
1) General subject: add up, amount, bespeak, betoken, connote, denote, imply, import, indicate, infer, mean, purport, represent, signify, spake, speak, spell, stand for, suggest (does the name suggest nothing to you? - разве это имя вам ничего не говорит?), designate, stand for (что-л.), be2) Colloquial: connotate4) Construction: matter5) Law: deem6) Diplomatic term: signal7) Business: amount to8) Makarov: implicate
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