-
1 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
-
2 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
-
3 clair
clair, e1 [klεʀ]1. adjectivea. ( = lumineux) brightc. ( = limpide) [eau, son] cleard. ( = peu consistant) [sauce, soupe] thine. [exposé, pensée, position] clear• je n'y vais pas, c'est clair et net ! I'm not going, that's for sure!f. ( = évident) clear2. adverb3. masculine noun► au clair• mettre les choses au clair avec qn to get things straight with sb► en clair ( = c'est-à-dire) to put it plainly ; ( = non codé) [message] in clear ; [émission] unscrambled4. compounds* * *
1.
claire klɛʀ adjectifavoir les yeux clairs — ( bleus) to have pale blue-grey GB ou blue-gray US eyes
2) ( lumineux) [logement, pièce] light3) Météorologie [nuit, temps] clearpar temps clair — ( de jour) on a clear day
4) ( limpide) clearà l'eau claire — [rincer] in clear water
5) ( intelligible) [texte, idées] clear6) ( sans équivoque) [message, décision] clear7) ( pas touffu) [forêt, blé] sparse
2.
voir clair — lit to see well
j'aimerais y voir clair dans cette histoire — fig I'd like to get to the bottom of this story
parler clair — fig to speak clearly
3.
nom masculin1) ( clarté) lighten clair — Télévision unscrambled; Armée, Informatique in clear; ( pour parler clairement) to put it clearly
mettre ses idées au clair — fig to get one's ideas straight
2) ( couleur) light colours [BrE] (pl)•Phrasal Verbs:••* * *klɛʀ clair, -e1. adj1) (opposé à foncé) light2) (opposé à sombre) (chambre) light, brightC'est une pièce très claire. — It's a very light room.
3) (eau, son) clear4) (explication, raisons) clear, (personne qui informe ou explique) clearSoyez plus clair. — Can you be a bit clearer?
2. advy voir clair (= comprendre) — to see
3. nmmettre au clair [notes] — to tidy up
tirer qch au clair — to clear sth up, to clarify sth
le plus clair de... — the greater part of...
* * *A adj1 ( pâle) [couleur, teinte] light; [teint] ( rosé) fair; ( frais) fresh; du tissu gris très clair very light grey GB ou gray US material; avoir les yeux clairs ( bleus) to have pale blue ou grey GB ou gray US eyes;3 Météo ( pas couvert) [journée, nuit, ciel, temps] clear; par temps clair ( de jour) on a clear day; ( de nuit) on a clear night;5 ( intelligible) [texte, personne, idées, langue] clear; en termes plus clairs in clearer terms; je n'ai pas les idées claires aujourd'hui I'm not thinking very clearly today;6 ( sans équivoque) [message, décision, situation] clear; suis-je clair? do I make myself clear?; il faut que les choses soient (bien) claires let's get things straight; pour moi, c'est clair, il est jaloux it's clear to me that he's jealous; il a été très clair sur ce point he was very clear on this point; c'est clair et net, c'est clair net et précis it's absolutely clear; il n'est pas clair dans cette histoire○ his role in this affair is not clear; il est/semble clair que it is/seems clear that; pour moi il est clair qu'il ment/que ça ne sert à rien it's clear to me that he's lying/that it's useless; passer le plus clair de son temps or de sa vie to spend most of one's time (à faire doing; dans in); dépenser le plus clair de son argent en bêtises to spend most of one 's money on rubbish;8 ( usé) [vêtement, tissu] worn through, thin;9 ( pas touffu) [forêt, blé] sparse.B adv il faisait clair it was already light; il fait clair très tôt it gets light very early; il fait clair très tard it stays light very late; voir clair lit to see well; avec mes lunettes je or j'y vois clair lit with my glasses I can see well ou properly; il ne or n'y voit pas clair lit his eyesight is not very good; j'aimerais y voir clair dans cette histoire fig I'd like to get to the bottom of this story; parler clair fig to speak clearly.C nm1 ( clarté) light; en clair TV unscrambled; Mil, Ordinat in clear; ( pour parler clairement) to put it clearly; en clair cela veut dire qu'il refuse to put it clearly it means that he refuses; mettre ses idées au clair fig to get one's ideas straight; tirer une histoire or une affaire au clair to get to the bottom of things;2 ( couleur) light coloursGB (pl);3 Art les ombres et les clairs d'un tableau the light and shadow of a painting.clair de lune moonlight; se promener au clair de lune to go for a walk in the moonlight.c'est clair comme le jour or de l'eau de roche it's clear as daylight, it's crystal clear.[ciel] clearune claire journée de juin a fine ou bright day in June2. [limpide - eau, son] cleara. [frais] clear complexionb. [pâle] fair ou light complexion3. [peu épais - sauce] thin[rare] sparse4. [couleur] lightporter des vêtements clairs to wear light ou light-coloured clothesvert/rose clair light green/pink5. [précis - compte-rendu] clearpourriez-vous être plus clair? could you make yourself more clear?, could you elucidate?se faire une idée claire de to form a clear ou precise picture ofil n'a rien compris, c'est clair et net he clearly hasn't understood a thingc'est clair comme le jour ou comme de l'eau de roche ou comme deux et deux font quatre it's crystal clear7. BIOLOGIE [œuf] unfertilized————————nom masculin1. [couleur] light colour2. ASTRONOMIE3. (locution)passer le plus clair de son temps à faire quelque chose to spend most ou the best part of one's time doing something————————adverbevoir clair: on n'y voit plus très clair à cette heure-ci the light's not very good at this time of the dayy voir clair [dans une situation] to see things clearlyy voir clair dans le jeu de quelqu'un to see right through somebody, to see through somebody's little game————————au clair locution adverbialeil faut tirer cette affaire au clair this matter must be cleared up, we must get to the bottom of this————————en clair locution adverbiale1. [sans code]‘en clair jusqu'à 20h’ ‘can be watched by non-subscribers until 8 o'clock’2. [en d'autres termes] to put it plainly————————claire nom féminin1. [bassin] oyster bed2. [huître] fattened oyster
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