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1 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
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2 допустимый длительный ток кабеля (провода)
допустимый длительный ток кабеля (провода)
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[Интент]
допустимый длительный ток (проводника)
Максимальный электрический ток, который проводник способен проводить в продолжительном режиме без превышения его установившейся температурой определённого значения.
Допустимый длительный ток является одной из основных характеристик проводника. Он представляет собой максимальный электрический ток, который проводник может проводить длительно (неделями, месяцами, годами) не перегреваясь. Значение допустимого длительного тока зависит от сечения проводника, материалов из которых выполнены проводник и его изоляция, способов монтажа проводника в электроустановке здания. Допустимый длительный ток проводника фактически является его номинальным током. В электроустановках зданий выполняют защиту проводников от сверхтоков, протекание которых по проводникам сопровождается их перегревом.
[ http://www.volt-m.ru/glossary/letter/%C4/view/11/]EN
current carrying capacity
maximum current a cable circuit (one or several conductors) can support resulting in a specified increase of the surface temperature of the conductor beyond the ambient temperature, not exceeding the maximum allowed operating temperature of the cable
[IEC 61156-1, ed. 3.0 (2007-06< size="2">)]FR
courant maximal admissible
courant maximal qu’un circuit de câble (un ou plusieurs conducteurs) peut supporter avec une augmentation spécifiée de la température de surface du conducteur au delà de la température ambiante, et ne dépassant pas la température maximale de fonctionnement autorisée du câble
[IEC 61156-1, ed. 3.0 (2007-06< size="2">)]Номинальный ток устройств защиты от короткого замыкания может превышать допустимый длительный ток кабеля.
[ ГОСТ Р 50571. 5-94 ( МЭК 364-4-43-77)]Допустимые длительные токи для проводов и кабелей, проложенных в коробах, а также в лотках пучками, должны приниматься...
[ПУЭ]Тематики
- кабели, провода...
- электроустановки
EN
- ampere capacity
- current carrying capacity
- current carrying capacity of the cable
- current carrying capacity of the conductors
- current-carrying capacity of the cable
FR
Русско-французский словарь нормативно-технической терминологии > допустимый длительный ток кабеля (провода)
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3 water
* -
4 measure
measure ⇒ Length measurement, Surface area measurements, Capacity measurement, Volume measurement, Weight measurement, SizesA n1 ( unit) unité f de mesure ; weights and measures les poids mpl et mesures fpl ; a measure of length une unité de longueur ; liquid measure mesure f de capacité pour les liquides ; to make sth to measure faire qch sur mesure ; it's made to measure ( garment) c'est fait sur mesure, c'est du sur mesure ;2 (standard amount, container) mesure f ; a double measure of vodka une double mesure de vodka ; he gave me short measure, I got short measure il a triché sur la quantité ;3 ( device for measuring) instrument m de mesure ;4 fig (qualified amount, extent) some ou a certain measure of un/-e certain/-e ; a measure of respect/success/change un certain respect/succès/changement ; to receive only a small measure of support ne recevoir qu'un soutien limité ; a good ou wide measure of autonomy une grande autonomie ; in large measure dans une large mesure ; she despised them and envied them in equal measure elle les méprisait autant qu'elle les enviait ; to distribute praise and blame in equal measure faire autant de compliments que de critiques ; in full measure [feel, possess, fulfil, contribute] pleinement ; [repay] entièrement ; [suffer] profondément ;5 (way of estimating, indication) ( of price rises) mesure f ; (of success, anger, frustration etc) mesure f, indication f ; (of efficiency, performance) critère m ; to be the measure of donner la mesure de ; to give some measure of donner une idée de [delight, failure, talent, arrogance etc] ; to use sth as a measure of utiliser qch pour mesurer [effects, impact, success] ; this is a measure of how dangerous it is ceci montre à quel point c'est dangereux ; this is a measure of how seriously they are taking the situation ceci montre à quel point ils prennent la situation au sérieux ; that is a measure of how well the company is run cela mesure la qualité de la gestion de la société ;6 ( assessment) beyond measure [change, increase] énormément ; [anxious, beautiful, difficult] extrêmement ; it has improved beyond measure il y a eu d'énormes progrès ; to take the measure of sb jauger qn ; I have the measure of them je sais ce qu'ils valent ;7 (action, step) mesure f (against contre ; to do pour faire) ; to take measures prendre des mesures ; safety ou security measure mesure de sécurité ; measures aimed at doing des mesures destinées à faire ; to do sth as a precautionary/an economy measure faire qch par mesure de précaution/d'économie ; as a preventive measure à titre préventif ; as a temporary measure provisoirement ; the measure was defeated Pol Jur la mesure a été rejetée ;B vtr1 ( by standard system) [person, instrument] mesurer [length, rate, depth, person, waist] ; to measure sth in mesurer qch en [metres, inches] ; to get oneself measured for faire prendre ses mesures pour ; over a measured kilometre Sport sur un kilomètre (délimité par des balises) ; to measure sth into mesurer qch dans [container] ;2 ( have a measurement of) mesurer ; to measure four by five metres mesurer quatre mètres sur cinq ; a tremor measuring 5.2 on the Richter scale une secousse de 5,2 sur l'échelle de Richter ;3 ( assess) mesurer [performance, ability, success, popularity] ; they measure their progress by the number of ils mesurent leur progrès au nombre de ;C vi [person, instrument] mesurer.for good measure pour faire bonne mesure ; to do things by half-measures se contenter de demi-mesures ; there can be no half-measures il ne saurait être question de demi-mesures.■ measure off:▶ measure off [sth] mesurer [fabric, ribbon etc].■ measure out:▶ measure out [sth] mesurer [land, flour, liquid] ; doser [medicine] ; compter [drops].■ measure up:▶ measure up [person] avoir les qualités requises ; [product] être de qualité ; to measure up against sb être l'égal de qn ; to measure up to être à la hauteur de [expectations] ; soutenir la comparaison avec [achievement] ;▶ measure up [sth] mesurer [room etc]. -
5 влажность почвы
влажность почвы
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
soil moisture
1) Water stored in soils.
2) One of the most important elements involved in pedological processes and plant growth. There are three basic forms:
a) water adhering in thin films by molecular attraction to the surface of soil particles and not available for plants is termed hygroscopic water.
b) Water forming thicker films and occupying the smaller pore spaces is termed capillary water. Since it is held against the force of gravity it is permanently available for plant growth and it is this type of soil water which contains plant nutrients in solution.
c) Water in excess of hygroscopic and capillary water is termed gravitational water, which is of a transitory nature because it flows away under the influence of gravity. When the excess has drained away the amount of water retained in the soil is termed its field capacity, when some of its pore spaces are still free of water.
(Source: LANDY / DUNSTE)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > влажность почвы
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6 ландшафт земной поверхности после завершения горных работ
ландшафт земной поверхности после завершения горных работ
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
landscape after mining
The process of mining disfigures the surface of the land, and in the absence of reclamation leads to permanent scars. The process spoils the vital topsoil, disrupts drainage patterns, destroys the productive capacity of agricultural and forest land and impairs their aesthetic and social value. (Source: WPRa)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > ландшафт земной поверхности после завершения горных работ
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7 сведение лесов
сведение лесов
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
deforestation
The removal of forest and undergrowth to increase the surface of arable land or to use the timber for construction or industrial purposes. Forest and its undergrowth possess a very high water-retaining capacity, inhibiting runoff of rainwater. (Source: GILP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > сведение лесов
См. также в других словарях:
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