-
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 fil
c black fil [fil]c black1. masculine noun━━━━━━━━━━━━━━━━━✦ The l is pronounced.━━━━━━━━━━━━━━━━━a. ( = brin) [de coton, nylon] thread ; [de laine] yarn ; [de cuivre, acier] wire ; [de marionnette, haricot] string ; [d'araignée] silk ; [d'appareil électrique] cord• fil de trame/de chaîne weft/warp yarnb. ( = téléphone) j'ai ta mère au bout du fil I have your mother on the phone• donner or passer un coup de fil à qn to give sb a callc. ( = matière) linend. ( = tranchant) edgee. ( = cours) [de discours, pensée] thread• au fil des jours/des ans as the days/years go (or went) by2. compounds► fil conducteur [de récit] main theme* * *fil
1.
nom masculin1) ( brin) thread, cotton [U] GB2) ( fibre naturelle) yarn; ( fibre synthétique) filament3) (câble, corde) ( en fibre) string; ( métallique) wire; ( de pêche) line; Sport ( d'arrivée) tape4) Électrotechnique, Télécommunications ( ligne) wire; (de micro, combiné, d'appareil électrique) flex GB, cord US; ( de téléphone) leadsans fil — [micro, téléphone] cordless
coup de fil — (colloq) (phone) call
au bout du fil — (colloq) on the phone; inventer
5) ( lin) linen [U]6) (enchaînement de texte, conversation) thread7) Culinaire (de haricot, céleri) string8) ( d'araignée) thread9) ( de bois) grain10) ( tranchant) edge
2.
au fil de locution prépositiveau fil des kilomètres, le paysage change — the scenery changes as you travel along
aller au fil de l'eau — lit, fig to go with the flow
Phrasal Verbs:••* * *fil nm1) (= textile) threadne tenir qu'à un fil [vie, réussite] — to hang by a thread
2) (électrique) wire, [téléphone] wire3) (= déroulement, cours) [histoire] threadau fil de l'eau — with the stream, with the current
4) [couteau] (= tranchant) edgesur le fil [gagner, s'imposer] — by a hair's breadth
* * *A nm1 Cout thread, cotton ¢ GB; du fil et une aiguille a needle and thread; fil d'or/d'argent gold/silver thread; avoir des fils d'argent dans les cheveux fig to have silver strands in one's hair; ⇒ avril, coudre, retordre;2 ( fibre naturelle) yarn; (fibre artificielle, synthétique) filament; fil cordé/mercerisé/peigné corded/mercerized/combed yarn; fil de polyamide polyamide filament;4 Électrotech, Télécom ( ligne) wire; (de micro, d'appareil électrique) flex GB, cord US; ( de téléphone) lead; ( de combiné) flex GB, cord US; sans fil [micro, téléphone] cordless; coup de fil○ (phone) call; j'ai passé/reçu dix coups de fil I made/got ten phone calls; passe-moi un coup de fil○ give me a ring GB ou call; il y a eu des coups de fil○ toute la matinée the phone's been ringing all morning; au bout du fil○ on the phone; ⇒ coiffer, inventer, patte;5 ( lin) linen ¢;6 (enchaînement de texte, conversation) thread; perdre le fil to lose the thread; perdre le fil des événements to lose track of events; fil de la pensée train of thought;7 Culin (de haricot, céleri) string; haricots sans fils stringless beans; haricots pleins de fils stringy beans;8 ( d'araignée) thread;10 ( tranchant) edge;11 ( défaut dans la pierre) fissure.B au fil de loc prép au fil des ans/des siècles over the years/the centuries; une tendance qui s'est confirmée au fil des jours/mois a tendency which became established as the days/months went by; au fil des minutes qui ont suivi l'accident in the first few minutes following the accident; au fil de l'enquête/de la conversation/des réunions in the course of the investigation/of the conversation/of the meetings; au fil des kilomètres, le paysage change the scenery changes as you travel along; aller au fil de l'eau lit, fig to go with the flow.fil à âme Tex core yarn; fil d'Ariane Mythol Ariadne's thread; fig vital clue; fil à bâtir Cout tacking thread; fil chirurgical Méd surgical thread; fil conducteur Électrotech conductor; (de roman, intrigue) thread; ( d'enquête) lead; fil de contact Rail overhead cable; fil continu Tex filament yarn; fil à coudre Cout sewing thread; fil à couper le beurre Culin cheese wire; il n'a pas inventé le fil à couper le beurre fig he's not very bright; fil dentaire Dent dental floss; fil directeur guiding principle; fil discontinu Tex staple yarn; fil de discussion Ordinat thread; fil d'Écosse Tex lisle; fil électrique Électrotech electric wire; fil de fer wire; fil de fer barbelé barbed wire; fil à plomb plumb line; fil à repriser darning thread; fil de terre earth wire GB, ground wire US; fil à tricoter Cout knitting yarn; fil de la Vierge gossamer thread.ne tenir qu'à un fil to hang by a thread; être mince comme un fil to be as thin as a rake; être sur le fil du rasoir to be on a knife edge; ne plus avoir un fil de sec○ to be soaked to the skin○.[fil] nom masculin[brin - de coton, de soie] piece of thread ; [ - de laine] strandcachemire trois/quatre fils three-ply/four-ply cashmerefil à bâtir/à coudre basting/sewing threadfil de Nylon® nylon thread2. [lin] linen3. [filament - de haricot] stringharicots pleins de/sans fils stringy/stringless beansfil conducteur ou d'Arianea. [d'une enquête] (vital) leadb. [dans une histoire] main themedébrouiller ou démêler les fils d'une intrigue to unravel the threads ou strands of a plotavoir un fil à la patte to be tied down, to have one's hands tied5. [câble] wirefil de cuivre/d'acier copper/steel wirefil télégraphique/téléphonique telegraph/telephone wirea. [généralement] wire fenceb. [barbelé] barbed wire fencec'est un fil de fer, ce type! that guy's as thin as a rake!6. (familier) [téléphone]au bout du fil on the phone, on the line7. [tranchant] edge8. [sens - du bois, de la viande] graindans le sens contraire au fil, contre le fil against the grainperdre/reprendre le fil d'une histoire to lose/to pick up the thread of a story————————au fil de locution prépositionnelle1. [le long de]aller au fil de l'eau to go with the current ou stream2. [au fur et à mesure de]au fil des semaines as the weeks go by, with the passing weeksau fil de la discussion je m'aperçus que... as the discussion progressed I realized that...————————sans fil locution adjectivale[télégraphie, téléphonie] wireless (modificateur)[rasoir, téléphone] cordless
См. также в других словарях:
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Cable — Ca ble (k[=a] b l), n. [F. c[^a]ble, LL. capulum, caplum, a rope, fr. L. capere to take; cf. D., Dan., & G. kabel, from the French. See {Capable}.] 1. A large, strong rope or chain, of considerable length, used to retain a vessel at anchor, and… … The Collaborative International Dictionary of English
cable molding — Cable Ca ble (k[=a] b l), n. [F. c[^a]ble, LL. capulum, caplum, a rope, fr. L. capere to take; cf. D., Dan., & G. kabel, from the French. See {Capable}.] 1. A large, strong rope or chain, of considerable length, used to retain a vessel at anchor … The Collaborative International Dictionary of English