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1 direct harm
1) Юридический термин: непосредственно причинённый вред, непосредственное причинение вреда -
2 direct harm
непосредственное причинение вреда; непосредственно причинённый вред -
3 harm
-
4 direct bodily harm
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5 direct bodily harm
непосредственное причинение телесного повреждения; непосредственно причинённое телесное повреждение* * * -
6 direct bodily harm
-
7 action
ˈækʃən сущ.
1) действие, поступок;
полит. акция, выступление to take prompt action ≈ принять срочные меры to prod, spur smb. into action ≈ побуждать кого-л. к действию She claimed she was anxious to avoid any action which might harm him. ≈ Она заявила, что очень хочет избежать любого действия, которое могло бы ему повредить. concerted action decisive action - direct action disciplinary action hasty action immediate action prompt action rash action remedial action sparing action united action vigorous action action painting Syn: act
2) действие;
работа( механизма и т. п.) ;
деятельность to be out of action ≈ не работать, быть выведенным из строя to go out of action ≈ выходить из строя to put into action ≈ приводить в действие to put out of action ≈ выводить из строя action of the heart ≈ деятельность сердца He's been out of action for 6 months with a serious knee injury. ≈ Он не работал в течение 6 месяцев из-за серьезной травмы колена. They were trapped after the lifts went out of action. ≈ Они попали в ловушку, после того как лифты вышли из строя. They have excelled in learning the lessons of business management theory, and putting them into action. ≈ Они превосходно усвоили теорию делопроизводства и успешно применили ее на практике.
3) воздействие, действие Her description of the nature and action of poisons is amazingly accurate. ≈ Ее описание природы и действия ядов на удивление точно.
4) обвинение, иск;
судебный процесс to bring, institute, take an action against smb. for smth. ≈ возбудить дело против кого-л. to dismiss an action ≈ прекратить иск He brought legal action against his neighbor. ≈ Он затеял процесс против своего соседа. The judge dismissed the action. ≈ Судья отклонил иск civil action
5) бой;
боевые действия in action ≈ в бою to be killed in action, to fall in action ≈ пасть в бою to break off action ≈ прекратить бой to go into action ≈ вступить в бой to take evasive action ≈ уклоняться, маневрировать 9 soldiers were killed and 15 wounded in action. ≈ В бою были убиты 9 и ранены 15 солдат. rearguard action action radius action spring action station
6) (the action) бурная деятельность;
центр активности, гуща событий a piece of the action, a slice of the action ≈ доля в какой-л. деятельности Hollywood is where the action is now. ≈ Центр активности сейчас - это Голливуд. Holiday spots have seen a dramatic revival and tourist chiefs are competing for a slice of the action. ≈ Интерес к местам отдыха резко возрос, и туристические лидеры соревнуются за получение своей доли прибыли. ∙ actions speak louder than words посл. ≈ не по словам судят, a по деламдействие;
- in * на ходу, действующий;
в действии;
- * at a distance( физическое) действие на расстоянии, дальнодействие;
- man of * человек дела, энергичный человек;
- to take * начинать действовать;
принимать меры;
- to bring into * приводить в действие;
- to put out of * вывести из строя;
- time has come for * настало время действовать;
- *! мотор! (команда начать съемку и т. п.) действие, работа;
деятельность;
- physical * физическая деятельность;
- * potential( физиологическое) потенциал действия;
- * of the bowels действие кишечника, стул действие, поступок;
- noble * благородный поступок;
- to be responsible for one's *s отвечать за свои действия;
- to judge smb. by his *s судить о ком-л. по его делам;
- all his *s show все его поведение говорит о акция;
выступление, действие;
- collective * коллективное действие;
- joint * совместные действия;
- overt * against smth., smb. открытое выступление против чего-л., кого-л.;
- crisis that demands * instead of debate кризисная ситуация, требующая действий, а не рассуждений воздействие, влияние;
- the * of a drug воздействие лекарства;
- * of wind upon a ship's sails принцип действия ветра на паруса действие, развертывание событий, основная сюжетная линия( в романе, пьесе и т. п.) ;
- double * две сюжетные линии;
- the development of the * развитие сюжета;
- unity of * единство действия (театроведение) физические действия, движения актера;
жесты (искусство) движение (юридическое) иск;
судебный процесс, судебное дело;
- amicable * "дружеское" судебное дело;
дело, возбужденное сторонами для получения судебного решения;
- to bring an * against smb., to take * against smb. возбудить против кого-л. судебное дело (военное) бой;
сражение;
боевые действия;
- *! к бою!;
- in * в бою;
в действии;
- * radius( военное) радиус действия;
радиус действия;
- * pendant боевой вымпел;
- * station боевой пост;
(морское) место по боевому расписанию;
- * stations! (морское) по местам!;
- * spring боевая пружина;
- to bring into * вводить в бой;
- to go into * вступать в бой;
- to come out of * выйти из боя;
выйти из строя;
- to be killed in * пасть в бою;
- he has seen * он побывал на передовой;
- through enemy * в результате действия противника (техническое) механизм (музыкальное) механика (инструмента) (военное) ударный механизм бурная деятельность в какой-л. области;
центр активности, гуща событий;
- to go where the * is направиться туда, где происходят основные события;
активно включиться в работу, в борьбу и т. п. (сленг) преступная деятельность;
спекуляция на черном рынке, торговля наркотиками и т. п.;
- a piece of the * доля в афере;
плата за соучастие азартная игра, игра на деньги;
- where can I find some *? где здесь можно сыграть на деньги? (церковное) служба, богослужения ( церковное) канон обедни (церковное) моменты богослужения с участием прихожан (математика) операция > *s speak louder than words не по словам судят, а по делам;
> suit the * to the word подкрепляйте слова делами( юридическое) (редкое) возбуждать уголовное делоabandon an ~ прекратить делоaction акция ~ бой;
in action в бою;
to be killed (или to fall) in action пасть в бою ~ влияние ~ воздействие ~ выступление ~ действие, воздействие ~ действие, поступок;
полит. акция, выступление;
overt action against открытое выступление против;
to take prompt action принять срочные меры ~ действие ~ действие механизма;
in action на ходу, действующий ~ деятельность;
action of the heart деятельность сердца;
to put out of action выводить из строя ~ иск ~ исковое требование ~ обвинение, иск;
судебный процесс;
to bring (или to enter, to lay) an action (against smb.) возбудить дело (против кого-л.) ~ pl поведение ~ поведение ~ поступок ~ работа ~ судебное дело, судебный процесс ~ судебное дело ~ судебное преследование ~ судебный процесс~ attr. боевой;
action spring боевая пружина;
action station боевой пост ~ attr.: ~ painting форма абстрактной живописи (разбрызгивание краски по холсту) ;
actions speak louder than words посл. = не по словам судят, а по делам ~ attr.: ~ radius радиус действия (самолета и т. п.)~ for breach of contract иск о нарушении договора~ for declaration исковое заявление~ for recovery of property иск о получении обратно собственности~ in conversion иск об обращении вверенного имущества в свою пользу~ in personam обязательственный иск~ in tort иск о возмещении вреда ~ in tort иск по гражданскому правонарушению~ of debt иск о взыскании долга~ of detinue иск о возвращении удерживаемого движимого имущества ~ of detinue иск о противоправном удержании чужого движимого имущества detinue: ~ юр. незаконный захват чужого имущества;
action of detinue иск о возвращении незаконно захваченного имущества~ on bill of exchange иск по переводному векселю ~ on bill of exchange иск по тратте~ attr.: ~ painting форма абстрактной живописи (разбрызгивание краски по холсту) ;
actions speak louder than words посл. = не по словам судят, а по делам~ attr.: ~ radius радиус действия (самолета и т. п.)~ attr. боевой;
action spring боевая пружина;
action station боевой пост~ attr. боевой;
action spring боевая пружина;
action station боевой пост~ to recover personalty иск о возвращении движимого имущества~ attr.: ~ painting форма абстрактной живописи (разбрызгивание краски по холсту) ;
actions speak louder than words посл. = не по словам судят, а по делам~ бой;
in action в бою;
to be killed (или to fall) in action пасть в бою~ обвинение, иск;
судебный процесс;
to bring (или to enter, to lay) an action (against smb.) возбудить дело (против кого-л.) bring an ~ возбуждать судебное дело bring an ~ выдвигать обвинение bring an ~ предъявлять иск bring: ~ возбуждать (дело) ;
to bring an action( against smb.) возбудить дело (против кого-л.) ;
to bring charges( against smb.) выдвигать обвинения (против кого-л.)community ~ совместное действие;
общественное действиеconsequent ~ последствия поступкаcontrol ~ регулирующее воздействие control ~ вчт. управляющее действиеcriminal ~ преступное деяние criminal: ~ преступный;
криминальный, уголовный;
criminal law уголовное право;
criminal action уголовное делоdeclaratory ~ (шотл.) деклараторный искdefault ~ судебное дело о неплатеже default ~ судебное дело об отказе от уплаты долгаdisciplinary ~ дисциплинарные мерыemergency ~ действия в чрезвычайных обстоятельствахfictiious ~ фиктивный искfrivolous ~ необоснованное действиеillegal ~ противозаконное действие~ бой;
in action в бою;
to be killed (или to fall) in action пасть в бою ~ действие механизма;
in action на ходу, действующийincidental ~ побочное действиеinnovative ~ новаторское действиеinput ~ вчт. входное воздействиеinstitution of an ~ учереждение активной терапииinvalidation ~ иск о признании недействительнымjoint ~ совместный искkeyboard ~s вчт. манипуляции на клавиатуреlegal ~ правовое действие legal ~ судебное дело legal ~ судебный иск legal ~ судебный процессlibel ~ дело по обвинению в клеветеmass ~ массовая акцияon-off ~ вчт. действие по принципу "включено-выключено"~ действие, поступок;
полит. акция, выступление;
overt action against открытое выступление против;
to take prompt action принять срочные мерыpending ~ дело, находящееся в процессе рассмотренияplan of ~ план действий plan: ~ of action план действийpolice ~ действие по поддержанию порядкаpossessory ~ посессорный искpreventive ~ превентивное действие~ деятельность;
action of the heart деятельность сердца;
to put out of action выводить из строяrent ~ иск о задолженности по арендной платеsingle-mode ~ одномодный режимsingle-pulse ~ моноимпульсный режимsupportive ~ действие для поддержки курсаtake ~ возбуждать судебное дело take ~ действовать take ~ принимать меры take: ~ action действовать;
принимать меры~ действие, поступок;
полит. акция, выступление;
overt action against открытое выступление против;
to take prompt action принять срочные мерыvexatious ~ недобросовестно возбужденное судебное делоwithdraw an ~ отзывать иск -
8 answer
ˈɑ:nsə
1. сущ.
1) ответ to give, offer, provide an answer ≈ дать ответ blunt, curt answer ≈ грубый ответ civil answer ≈ вежливый ответ diplomatic answer ≈ дипломатичный ответ direct answer ≈ прямой ответ equivocal answer ≈ двусмысленный ответ evasive, vague answer ≈ уклончивый, туманный ответ glib answer ≈ бойкий ответ ready answer ≈ готовый ответ straight answer ≈ прямой ответ wise answer ≈ мудрый ответ witty answer ≈ остроумный ответ negative answer ≈ отрицательный ответ positive answer ≈ положительный ответ right answer ≈ правильный ответ wrong answer ≈ ошибочный ответ dusty answer ≈ неудовлетворительный ответ in answer to know all the answers Syn: riposte, reply, response Ant: question
2) возражение, противоречие Syn: objection, rejoinder, retort
3) ответное действие His only answer was to walk out. ≈ Его единственным ответом был демонстративный уход.
4) решение (вопроса, задачи и т. п.)
5) юр. возражение ответчика Syn: defense, plea
6) соответствие, замена Television's answer to the news magazines. ≈ Телевидение - это замена информационным журналам.
2. гл.
1) отвечать;
откликаться, реагировать to answer politely (sharply, rudely, etc.) ≈ отвечать вежливо (резко, грубо и т. п.) to answer а question (smb.'s remark, etc.) ≈ отвечать на вопрос( чье-л. замечание и т. п.) to answer in the affirmative( in the negative) ≈ дать положительный (отрицательный) ответ He answered me nothing. ≈ Он мне ничего не ответил. to answer to the medical treatment ≈ поддаваться лечению answer the door answer the phone answer a call answer to the name answer the helm
2) подходить, соответствовать, удовлетворять (часто to) to answer the description ≈ соответствовать описанию to answer а demand( smb. 's wishes, etc.) ≈ отвечать/соответствовать потребности( желаниям и т. п.) The man answers to the description of the wanted murderer. ≈ Этот человек совпадает по описанию с разыскиваемым убийцей. to answer expectations ≈ не обмануть( чьих-л.) надежд, ожиданий
3) ручаться;
быть ответственным, нести ответственность( for - за кого-л.) I can't answer for his honesty. ≈ Я не могу поручиться за его честность. to answer for the consequences ≈ отвечать за последствия
4) нести ответственность( to - перед кем-л.) Who will answer to me for this? ≈ Кто мне за это ответит? Syn: account
2.
2)
5) удаваться;
иметь успех The experiment has not answered at all. ≈ Опыт не удался.
6) служить (в качестве или взамен чего-л.), заменять( что-л.) A piece of paper on the table answered for a table-cloth. ≈ Вместо скатерти на столе лежал лист бумаги. Syn: satisfy ∙ answer back answer for be answered for answer upответ;
возражение - favourable * положительный ответ;
- in * to smth. в ответ на что-л;
возражая на что-л.;
- an * in the affirmative положительный ответ;
- to give an * отвечать;
- to have an * получать ответ;
- to vouchsafe no * не удостоить ответом;
- to teach foreign languages through questions and *s преподавать иностранные языки вопросно-ответным методом ответное действие, реакция - the * was a volley of fire в ответ раздался залп;
- his only * was to walk out вместо ответа он вышел из комнаты решение;
ответ, объяснение - to find the * to smth. решить проблему чего-л., справиться с чем-л., победить что-л.;
- prohibition might not be the * запрещение спиртных напитков еще не решение проблемы;
- the system is not necessarily the * for these states данная система может оказаться неподходящей для этих стран решение - the * to 3 x 17 is 51 3 х 17 равно 51;
- * to a chess problem решение шахматной задачи ответ, разгадка равноценная, достойная замена - this fictional spy is a French * to James Bond шпион в этом французском романе вполне достоин своего коллеги Джеймса Бонда;
- he has the reputation of being the American * to Caruso у него репутация американского Карузо (юридическое) письменное объяснение ответчика по делу( музыкальное) ответ > he knows all the *s он за словом в карман не полезет;
> a soft * turns away wrath( библеизм) кроткий ответ отвращает гнев;
повинную голову меч не сечет;
> the *'s a lemon (сленг) дудки!, номер не пройдет!;
> * to the maiden's prayer( сленг) красавец-мужчина;
популярный киноактер отвечать - to * questions отвечать на вопросы;
- to * a charge возражать на обвинение;
- to * smb. отвечать кому-л., - not to * a word не вымолвить в ответ ни слова;
откликаться, реагировать;
- to * a call откликаться на зов;
ответить по телефону;
- to * the bell отворить дверь;
- to * to a name of откликаться на имя;
- to * blows with blows отвечать ударом на удар;
- to * to a treatment поддаваться лечению;
- to * the whip повиноваться удару хлыста;
- to * the helm (морское) слушаться руля;
- when I call you, you should * at once когда я тебя зову, ты должен сразу откликнуться соответствовать, отвечать, удовлетворять - to * the description соответствовать описанию;
- to * hopes оправдывать надежды удаваться, иметь успех - the plan has not *ed план не удался исполнять - to * orders исполнять приказания;
- to * obligations выполнять обязательства удовлетворять - to * claims удовлетворять жалобы;
- to * debts уплачивать долги отвечать, ручаться, нести ответственность - to * for smb. ручаться за кого-л.;
- to * smb.'s honesty ручаться за чью-л. честность;
- to * for one's wrong-doings отвечать за свои проступки отвечать, нести ответственность перед кем-л. - you'll have to * to me if any harm comes to this child если с ребенком что-нибудь случится, вы мне за него ответите заменять;
служить - on the picnic a newspaper *ed for a tablecloth на пикнике газета заменяла нам скатертьanswer ответ;
in answer to в ответ на;
to know all the answers иметь на все готовый ответ;
быстро реагировать;
to have a ready answer иметь готовый ответ ~ быть ответственным ~ возражать (to - на обвинение) ~ возражение, возражать ~ возражение ~ юр. возражение ответчика ~ исполнять, удовлетворять;
to answer the helm мор. слушаться руля ~ объяснение ~ ответ, отвечать ~ ответ ~ ответное действие ~ отвечать, откликаться ~ отвечать ~ письменные объяснения ответчика по делу ~ реагировать (to) ~ реагировать ~ реакция ~ мат. решение (задачи) ~ решение (вопроса и т. п.) ~ решение ~ ручаться (for - за кого-л.) ;
быть ответственным;
to answer for the consequences отвечать за последствия ~ служить (в качестве или взамен чего-л.) ;
a piece of paper on the table answered for a table-cloth вместо скатерти на столе лежал лист бумаги ~ соответствовать;
подходить;
to answer the description (purpose) соответствовать описанию (цели) ~ соответствовать ~ удаваться;
иметь успех;
the experiment has not answered at all опыт не удался~ a call откликнуться на зов;
~ a call ответить по телефону~ back дерзить~ ручаться (for - за кого-л.) ;
быть ответственным;
to answer for the consequences отвечать за последствия~ in the negative отрицательный ответ~ соответствовать;
подходить;
to answer the description (purpose) соответствовать описанию (цели) description: to answer (to) the ~ соответствовать описанию;
совпадать с приметами~ the door (или the bell) открыть дверь (на звонок, на стук и т. п.) door: to answer the ~ открыть дверь (на стук или звонок) ;
behind closed doors за закрытыми дверями, тайно~ исполнять, удовлетворять;
to answer the helm мор. слушаться руля helm: ~ рулевое колесо;
штурвал, румпель;
the man at the helm рулевой;
кормчий;
to answer the helm слушаться руля~ the phone подойти к телефону~ удаваться;
иметь успех;
the experiment has not answered at all опыт не удалсяanswer ответ;
in answer to в ответ на;
to know all the answers иметь на все готовый ответ;
быстро реагировать;
to have a ready answer иметь готовый ответanswer ответ;
in answer to в ответ на;
to know all the answers иметь на все готовый ответ;
быстро реагировать;
to have a ready answer иметь готовый ответanswer ответ;
in answer to в ответ на;
to know all the answers иметь на все готовый ответ;
быстро реагировать;
to have a ready answer иметь готовый ответ~ служить (в качестве или взамен чего-л.) ;
a piece of paper on the table answered for a table-cloth вместо скатерти на столе лежал лист бумаги -
9 action
['ækʃ(ə)n]сущ.1) действие, поступок; акция, выступлениеimmediate / prompt / vigorous — незамедлительные действия
concerted / united action — согласованные действия, объединённое выступление
hasty / rash action — опрометчивый поступок
to prod, spur smb. into action — побуждать кого-л. к действию
- direct actionShe claimed she was anxious to avoid any action which might harm him. — Она заявила, что очень хочет избежать любого действия, которое могло бы ему повредить.
- disciplinary action
- remedial action
- sparing actionSyn:2) действие; работа ( механизма); деятельностьto be out of action — не работать, быть выведенным из строя
He's been out of action for 6 months with a serious knee injury. — Он не работал в течение 6 месяцев из-за серьёзной травмы колена.
They were trapped after the lifts went out of action. — Они попали в ловушку, после того как лифты вышли из строя.
They have excelled in learning the lessons of business management theory, and putting them into action. — Они превосходно усвоили теорию делопроизводства и успешно применили её на практике.
3) воздействие, действие4) юр. обвинение, иск; судебный процессto bring / institute / take an action against smb. for smth. — возбудить дело против кого-л. о чём-л.
He brought legal action against his neighbor. — Он затеял процесс против своего соседа.
The judge dismissed the action. — Судья отклонил иск
5) бой; боевые действияto fall / be killed in action — пасть в бою
- probing actionto take evasive action — уклоняться, маневрировать
- action radius
- action spring
- action station6) ( the action) бурная деятельность; центр активности, гуща событийa piece of the action, a slice of the action — доля в какой-л. деятельности
Hollywood is where the action is now. — Центр активности сейчас в Голливуде.
Holiday spots have seen a dramatic revival and tourist chiefs are competing for a slice of the action. — Интерес к местам отдыха резко возрос, и туристические лидеры соревнуются за получение своей доли прибыли.
••Actions speak louder than words. — посл. Не по словам судят, а по делам.
-
10 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
-
11 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
-
12 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
Немецко-русский словарь нормативно-технической терминологии > Dauerstrombelastbarkeit, f
-
13 Strombelastbarkeit, 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
Немецко-русский словарь нормативно-технической терминологии > Strombelastbarkeit, f
-
14 continuous current-carrying capacity
длительная пропускная способность по току
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
(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
Англо-русский словарь нормативно-технической терминологии > continuous current-carrying capacity
-
15 ampacity (US)
(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
Англо-русский словарь нормативно-технической терминологии > ampacity (US)
-
16 continuous current
(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
непрерывный ток
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999]Тематики
- электротехника, основные понятия
EN
Англо-русский словарь нормативно-технической терминологии > continuous current
-
17 current-carrying capacity
(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
предельно допустимый ток
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
прочность печатной платы к токовой нагрузке
Свойство печатной платы сохранять электрические и механические характеристики после воздействия максимально допустимой токовой нагрузки на печатный проводник или металлизированное отверстие печатной платы.
[ ГОСТ Р 53386-2009]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > current-carrying capacity
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