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1 multiple-conductor, heat-and flame-resistant, armored cable
Engineering: MHFAУниверсальный русско-английский словарь > multiple-conductor, heat-and flame-resistant, armored cable
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2 multiple-conductor, shielded, pressure resistant cable
Engineering: MCSPУниверсальный русско-английский словарь > multiple-conductor, shielded, pressure resistant cable
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3 многожильный кабель
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4 многожильный кабель
многожильный кабель
многожильный провод
многожильный шнур
Кабель (провод, шнур), в котором число жил более трех.
[ ГОСТ 15845-80]EN
multicore cable
cable having more than one core
Note – The French term «câble multipolaire» is more specifically used to designate the cable constituting the phases of a multiphase system (example: three-core cable).
[EV ref 461-06-04]
multiconductor cable
cable having more than one conductor, some of which may be uninsulated
[IEV ref 461-06-03]FR
câble multiconducteur
câble multipolaire
câble comprenant plus d'un conducteur isolé
Note – Le terme câble multipolaire est plus particulièrement utilisé pour désigner le câble constituant les phases d'un système polyphasé (exemple: câble tripolaire).
[EV ref 461-06-04]
câble multiconducteur
câble multipolaire
câble comprenant plus d'une âme, dont éventuellement certaines non isolées
[IEV ref 461-06-03]Core - (токопроводящая) жила;
Insulator - изоляция жилы;
Protective Sheath - оболочка кабеля.Недопустимые, нерекомендуемые
Примечание(1) Мнение автора карточкиТематики
- кабели, провода...
EN
- bundled cable
- multi-pole cable
- multiconductor cable
- multicore cable
- multiple cable
- multiple-conductor cable
- multiple-core cable
- multistrand cable
- N-conductor cable
- polycore cable
DE
- mehradriges Kabel, n
- Mehrleiterkabel, n
FR
Русско-французский словарь нормативно-технической терминологии > многожильный кабель
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5 многожильный кабель
multiple-conductor cable, multiconductor cable, multicore cable, multiple cableРусско-английский научно-технический словарь Масловского > многожильный кабель
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6 кабель
cable
(многожильный провод)
- аэродромного питания — external power cable, ехт pwr cable
- высокого напряжения — high-voltage cable
- высокого напряжения (снетемы зажигания) — high-tension cable, нт cable
-, коаксиальный — coaxial cable
-, многожильный — multiple-conductor cable
-, отрывной (бортового питания ракеты) — umbilical cable
- питания — power cable
- подключения контрольно-проверочной аппаратуры — checkout.cable
-, приблочный — unit cable
- (цепи) пуска (ракетного вооружения) — firing cableРусско-английский сборник авиационно-технических терминов > кабель
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7 многожильный кабель
1) Aviation: multi-wire cable, multiple conductor cable2) Engineering: bundle conductor, bundled conductor, polycore cable, stranded conductor (скрученный), snake cable3) Construction: bunched cable, multiple cable4) Railway term: cable conductor5) Automobile industry: multicore cable6) Telecommunications: many-conductor cable, multi-core cable, wire harness7) Electronics: bundled cable, multifilamentary conductor, multiple-conductor cable, multistrand cable8) Information technology: multipair cable10) Geophysics: multi-cable11) Cables: multicore cable (с несколькими изолированными жилами)12) Oil processing plants: multicable13) Aluminium industry: bundled conductor (из алюминия), bundled conductor cable (из алюминия), bundled multicore cable (из алюминия), bundled polycore cable (из алюминия), multicore cable (из алюминия), polycore cable (из алюминия)14) Electrical engineering: N-conductor cableУниверсальный русско-английский словарь > многожильный кабель
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8 многожильный кабель
- polycore cable
- N-conductor cable
- multistrand cable
- multiple-core cable
- multiple-conductor cable
- multiple cable
- multicore cable
- multiconductor cable
- multi-pole cable
- bundled cable
многожильный кабель
многожильный провод
многожильный шнур
Кабель (провод, шнур), в котором число жил более трех.
[ ГОСТ 15845-80]EN
multicore cable
cable having more than one core
Note – The French term «câble multipolaire» is more specifically used to designate the cable constituting the phases of a multiphase system (example: three-core cable).
[EV ref 461-06-04]
multiconductor cable
cable having more than one conductor, some of which may be uninsulated
[IEV ref 461-06-03]FR
câble multiconducteur
câble multipolaire
câble comprenant plus d'un conducteur isolé
Note – Le terme câble multipolaire est plus particulièrement utilisé pour désigner le câble constituant les phases d'un système polyphasé (exemple: câble tripolaire).
[EV ref 461-06-04]
câble multiconducteur
câble multipolaire
câble comprenant plus d'une âme, dont éventuellement certaines non isolées
[IEV ref 461-06-03]Core - (токопроводящая) жила;
Insulator - изоляция жилы;
Protective Sheath - оболочка кабеля.Недопустимые, нерекомендуемые
Примечание(1) Мнение автора карточкиТематики
- кабели, провода...
EN
- bundled cable
- multi-pole cable
- multiconductor cable
- multicore cable
- multiple cable
- multiple-conductor cable
- multiple-core cable
- multistrand cable
- N-conductor cable
- polycore cable
DE
- mehradriges Kabel, n
- Mehrleiterkabel, n
FR
Русско-английский словарь нормативно-технической терминологии > многожильный кабель
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9 многожильный кабель
- Mehrleiterkabel, n
- mehradriges Kabel, n
многожильный кабель
многожильный провод
многожильный шнур
Кабель (провод, шнур), в котором число жил более трех.
[ ГОСТ 15845-80]EN
multicore cable
cable having more than one core
Note – The French term «câble multipolaire» is more specifically used to designate the cable constituting the phases of a multiphase system (example: three-core cable).
[EV ref 461-06-04]
multiconductor cable
cable having more than one conductor, some of which may be uninsulated
[IEV ref 461-06-03]FR
câble multiconducteur
câble multipolaire
câble comprenant plus d'un conducteur isolé
Note – Le terme câble multipolaire est plus particulièrement utilisé pour désigner le câble constituant les phases d'un système polyphasé (exemple: câble tripolaire).
[EV ref 461-06-04]
câble multiconducteur
câble multipolaire
câble comprenant plus d'une âme, dont éventuellement certaines non isolées
[IEV ref 461-06-03]Core - (токопроводящая) жила;
Insulator - изоляция жилы;
Protective Sheath - оболочка кабеля.Недопустимые, нерекомендуемые
Примечание(1) Мнение автора карточкиТематики
- кабели, провода...
EN
- bundled cable
- multi-pole cable
- multiconductor cable
- multicore cable
- multiple cable
- multiple-conductor cable
- multiple-core cable
- multistrand cable
- N-conductor cable
- polycore cable
DE
- mehradriges Kabel, n
- Mehrleiterkabel, n
FR
Русско-немецкий словарь нормативно-технической терминологии > многожильный кабель
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10 кабель
cord assembly, cable, conductor* * *ка́бель м.
cableзаде́лывать [подсоединя́ть] ка́бель (напр. в разъём, в наконечник и т. п.) — terminate a cable in (e. g., connector, lug, etc.)нама́тывать ка́бель на бараба́н — coil a cable on a drumка́бель натя́гивается ве́тром — a cable is tugged by the windпередава́ть по ка́белю — send [signal, transmit] over [through] a cableпрокла́дывать ка́бель — install a cableпрокла́дывать ка́бель в земле́ — bury a cable (underground), install a cable in groundпрокла́дывать ка́бель на лотка́х в транше́е — lay a cable in troughs in an open trenchпрокла́дывать ка́бель на опо́рах — raise a cable to polesпрокла́дывать ка́бель на пове́рхности земли́ — lay a cable on the groundпрокла́дывать не́сколько ка́белей в одно́м кана́ле — run several cables togetherпрокла́дывать ка́бель под водо́й — lay [install] a cable in water [underwater]прокла́дывать ка́бель че́рез во́дную прегра́ду — lay a cable for water crossingпрота́скивать ка́бель ( в кабельную канализацию) — draw in a cable (into a conduit or duct)протя́гивать ка́бель в кана́л — pull a cable into a ductразде́лывать ка́бель — dress [prepare, fan out] a cableраска́тывать ка́бель — lay [reel] out a cableсра́щивать ка́бель — splice a cableка́бель «трёт» (задевает о стенки, заедает) — the cable (rope) chafesброниро́ванный ка́бель — armoured cableвзрывно́й ка́бель — shot-firing [blasting] cableка́бель в металли́ческой оболо́чке — metal-sheathed cableвозду́шный ка́бель — aerial [overhead] cableка́бель в пластма́ссовой оболо́чке — plastic-sheathed cableка́бель высо́кого напряже́ния — high-tension [high-voltage] cableгазонапо́лненный ка́бель — gas-filled cableгазонапо́лненный ка́бель под давле́нием — high-pressure gas-filled cableги́бкий ка́бель — flexible cable; ( в щёточном механизме электромашины) flexible lead, pig-tailпереда́ча то́ка от щё́тки к па́льцу осуществля́ется ги́бким ка́белем — a flexible lead [pig-tail] is provided from the brush to the fingerгородско́й телефо́нный ка́бель — exchange cableдвухжи́льный ка́бель — брит. double-core cable; амер. double-conductor cableдвухпа́рный ка́бель — double-D cableка́бель для вну́тренней устано́вки — indoor cableка́бель для нару́жной устано́вки — external [outdoor] cableка́бель звё́здной скру́тки — spiral-quad cable; брит. star-quad cableкарота́жный ка́бель — borehole [logging] cableкоаксиа́льный ка́бель — coaxial cableконтро́льный ка́бель — ( в электроприборах) control cable; ( на линиях электропередачи) pilot cableкороносто́йкий ка́бель — corona-proof cableкрарупизи́рованный ка́бель — continuously loaded [Krarup] cableкру́глый ка́бель — round cableле́нточный ка́бель — ribbon cableлифтово́й ка́бель — брит. lift cable; амер. elevator cableмагистра́льный ка́бель тлф. — trunk [toll, long-distance] cableмаслонапо́лненный ка́бель — oil-filled cableмеждугоро́дный ка́бель — trunk [toll, long-distance] cableмежстанцио́нный ка́бель — interoffice cableмногожи́льный ка́бель — брит. multicore cable; амер. multiple-conductor cableка́бель на опо́рах — aerial [overhead] cableодножи́льный ка́бель — брит. single-core cable; амер. single-conductor cableосвети́тельный ка́бель — lighting cableосвинцо́ванный ка́бель — lead-covered cableособоги́бкий ка́бель — flexible trailing cableка́бель па́рной скру́тки — paired [nonquadded] cableпло́ский ка́бель — flat cableпневмати́ческий ка́бель — pneumatic long lineподвесно́й ка́бель — aerial [overhead] cableподво́дный ка́бель — subaqueous [underwater] cableподзе́мный ка́бель — ( проложенный прямо в траншее) buried cable; ( проложенный в кабельной канализации) underground cableпупинизи́рованный ка́бель — coil-loaded cableрадиочасто́тный ка́бель — radio-frequency [r.f.] cableразмагни́чивающий ка́бель — degaussing cableка́бель с бума́жной изоля́цией — paper-insulated cableсва́рочный ка́бель — welding cableка́бель сверхвысо́кого напряже́ния — extra-high-voltage cableсверхпроводя́щий ка́бель — superconducting cableсветово́й ка́бель — light-conducting [light-transmitting] cableка́бель с возду́шно-бума́жной изоля́цией — air-space [dry-core] cableка́бель свя́зи — communication cableка́бель силово́го вво́да — service cableсилово́й ка́бель — power cableсимметри́чный ка́бель — balanced cableка́бель систе́мы поса́дки, веду́щий ав. — leader cableслабото́чный ка́бель — communication cableка́бель с ла́ковой изоля́цией — varnished cableка́бель с ма́лыми поте́рями — low-loss cableка́бель с ма́сляным охлажде́нием — oil-cooled cableка́бель с на́триевой жи́лой — sodium cableка́бель с неоргани́ческой изоля́цией — mineral-insulated cableка́бель с несу́щим тро́сом — self-supporting cableка́бель с пластма́ссовой изоля́цией — plastic-insulated cableка́бель с поясно́й изоля́цией — belted cableка́бель с рези́новой изоля́цией — rubber-insulated cableстанцио́нный ка́бель тлф. — office [inside] cableступе́нчатый ка́бель — graded cableка́бель с хлопчатобума́жной изоля́цией — cotton-covered cableка́бель с центра́льным кана́лом — annular cableка́бель с эма́левой изоля́цией — enameled(-wire) cableтелевизио́нный ка́бель — (tele)vision [TV] cableтелевизио́нный, ка́мерный ка́бель — TV camera cableка́бель управле́ния — control cableка́бель це́пи зажига́ния дви́гателя ракет. — ignition cableка́бель це́пи пу́ска ракет. — firing cableчетвё́рочный ка́бель — quadded cableша́хтный ка́бель — shaft cableшла́нговый ка́бель — flexible trailing cableэкрани́рованный ка́бель — screened [shielded] cable -
11 кабель
м. cableкабель «трёт» — the cable chafes
гибкий кабель — flexible cable; flexible lead
передача тока от щётки к пальцу осуществляется гибким кабелем — a flexible lead is provided from the brush to the finger
двухжильный кабель — double-core cable; double-conductor cable
кабель звёздной скрутки — spiral-quad cable; star-quad cable
контрольный кабель — control cable; pilot cable
лифтовой кабель — lift cable; elevator cable
многожильный кабель — multicore cable; multiple-conductor cable
одножильный кабель — single-core cable; single-conductor cable
подземный кабель — buried cable; underground cable
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12 многожильный кабель
bundled cable, multiple-conductor cable, bundle conductor, multifilamentary conductor, stranded conductorРусско-английский словарь по электронике > многожильный кабель
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13 многожильный кабель
multifilamentary conductor, stranded conductor, bundled cable, multiple-conductor cable, bundle conductorРусско-английский словарь по радиоэлектронике > многожильный кабель
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14 многожильный
многожильный кабель — multicore cable; multiple-conductor cable
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15 многожильный провод
1) Engineering: bundle conductor, bundled conductor, cable wire, composite conductor, litz wire, litzendraht wire, multifilament wire, multistranded conductor, multiwire conductor, strand wire, stranded cable, stranded wire2) Railway term: litzendraht3) Metallurgy: split conductor (из изолированных жил)4) Telecommunications: split conductor5) Electronics: multifilamentary conductor, strand, stranded conductor6) Oil: cable7) Drilling: multicore cable, multiple-core cable8) Cables: twisted conductor, twisted wireУниверсальный русско-английский словарь > многожильный провод
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16 многожильный экранированный кабель, устойчивый к высокому давлению
Engineering: multiple-conductor, shielded, pressure resistant cableУниверсальный русско-английский словарь > многожильный экранированный кабель, устойчивый к высокому давлению
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17 многожильный, теплоустойчивый огнеупорный армированный кабель
Engineering: multiple-conductor, heat-and flame-resistant, armored cableУниверсальный русско-английский словарь > многожильный, теплоустойчивый огнеупорный армированный кабель
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18 длительный допустимый ток
- Strombelastbarkeit, f
- Dauerstrombelastbarkeit, f
(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-немецкий словарь нормативно-технической терминологии > длительный допустимый ток
-
19 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
-
20 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
- 1
- 2
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