when+in+need

to go home — идти домой

to go three miles in an hour — проходить три мили в час

What time will you go to the store today? — Когда ты пойдёшь сегодня в магазин?

Where did Peter go? — Куда пошёл Питер?

We are going too fast. — Мы идём слишком быстро.

Who goes? Stand, or I fire. — Стой, кто идёт? Стрелять буду.

The baby went behind his mother to play a hiding game. — Малыш решил поиграть в прятки и спрятался за маму.

Go ahead, what are you waiting for? — Идите вперёд, чего вы ждёте?

I'll go ahead and warn the others to expect you later. — Я пойду вперёд и предупрежу остальных, что вы подойдёте позже.

My brother quickly passing him, went ahead, and won the match easily. — Мой брат быстро обогнал его, вышел вперёд и легко выиграл матч.

As the roads were so icy, the cars were going along very slowly and carefully. — Так как дороги были покрыты льдом, машины продвигались очень медленно и осторожно.

Can I go along with you? — Могу я сопровождать вас?

Shall we go back there for our holiday next year? — В наш следующий отпуск мы поедем туда же?

The deer has gone beyond the trees; I can't shoot at it from this distance. — Олень зашёл за деревья; я не могу попасть в него с этого расстояния.

You've missed the bus, it just went by. — Ты опоздал на автобус, он только что проехал.

My bus just went by the stop empty! — Мой автобус пустым проскочил остановку!

Let's go forward to the front of the hall. — Давай продвинемся к началу зала.

I have to go in now, my mother's calling me for tea. — Мне надо идти, мама зовёт меня пить чай.

The car went into a tree and was severely damaged. — Машина влетела в дерево и была сильно повреждена.

The police examined the cars and then allowed them to go on. — Полицейские осмотрели машины, а потом пропустили их.

I don't think you should go out with that bad cold. — Я думаю, с такой простудой тебе лучше сидеть дома.

It's dangerous here, with bullets going over our heads all the time. — Здесь опасно, пули так и свистят над головами.

I fear that you cannot go over to the cottage. — Боюсь, что ты не сможешь сходить в этот коттедж.

I spent a day or two on going round and seeing the other colleges. — Я провёл день или два, обходя другие колледжи.

This material is so stiff that even my thickest needle won't go through. — Этот материал настолько плотный, что даже моя самая большая игла не может проткнуть его.

Don't leave me alone, let me go with you! — Не бросай меня, позволь мне пойти с тобой!

The piano won't go through this narrow entrance. — Фортепиано не пройдёт сквозь этот узкий вход.

There is no such thing as a level street in the city: those which do not go up, go down. — В городе нет такого понятия как ровная улица: те, которые не идут вверх, спускаются вниз.

to go abroad — поехать за границу

to go by train — ехать поездом

to go by plane — лететь самолётом

to go pilgrimage — совершать паломничество

to go on travels, to go on a journey, to go on a voyage — отправиться в путешествие

He wants me to go on a cruise with him. — Он хочет, чтобы я отправился с ним в круиз.

Please go now, I'm getting tired. — Теперь, пожалуйста, уходи, я устал.

I have to go at 5.30. — Я должен уйти в 5.30.

There was no answer to my knock, so I went away. — На мой стук никто не ответил, так что я ушёл.

Why did the painter leave his family and go off to live on a tropical island? — Почему художник бросил свою семью и уехал жить на остров в тропиках?

At the end of this scene, the murderer goes off, hearing the police arrive. — В конце сцены убийца уходит, заслышав приближение полиции.

to go to the doctor's — пойти к врачу

to go to prison — попасть в тюрьму

to go for a swim — пойти поплавать

to go to sleep — ложиться спать

to go to bed — идти, отправляться, ложиться спать

to go to press — идти в печать, печататься

to go to grass — пастись

Would you go for some milk for me? — Не сходишь за молоком для меня?

You'd better go for the police. — Ты лучше сбегай за полицией.

Are you going out to the post? — Ты собираешься выйти на почту?

to go hunting — ходить на охоту

The bus goes right to the centre of town. — Автобус ходит прямо до центра города.

The ship goes between the two islands. — Корабль курсирует между двумя островами.

to go above one's ground — идти, высоко поднимая ноги

to go even — передвигаться спокойным ровным шагом

to go the wrong way — идти не тем путём

the man who goes straight in spite of temptation — человек, который идёт не сбиваясь с пути, несмотря на соблазны

She will never go my way, nor, I fear, shall I ever go hers. — Она никогда не будет действовать так, как я, и, боюсь, я никогда не буду действовать так, как она.

to go to school — ходить в школу

When I was young, we went to church every Sunday. — Когда я был маленьким, мы каждое воскресенье ходили в церковь.

Does this road go to the city? — Эта дорога идёт в город?

The boundary here goes parallel with the river. — Граница идёт здесь вдоль реки.

This door goes outside. — Эта дверь выходит наружу.

The annual dinner never goes better than when he is in the chair. — Ежегодный обед проходит лучше всего, когда он председательствует.

How did things go at the office today? — Как сегодня шли дела в офисе?

The game went so strangely that I couldn't possibly tell. — Игра шла так странно, что и не рассказать.

The election went against him. — Выборы кончились для него неудачно.

How did the voting go? — Как прошло голосование?

How did the game go? — Как закончилась игра?

What has gone of...? — Что стало, что произошло с...?

What's gone with that boy? — Что произошло с этим парнем?

Nobody in Porlock ever knew what has gone with him. — Никто в Порлоке так и не узнал, что с ним стало.

The battery in this watch is going. — Батарейка в часах садится.

Sometimes the eyesight goes forever. — Иногда зрение теряют навсегда.

I could feel my brain going. — Я чувствовал, что мой ум перестаёт работать.

You see that your father is going very fast. — Вы видите, что ваш отец очень быстро сдаёт.

The platform went. — Трибуна обрушилась.

About half past three the foremast went in three places. — Около половины четвёртого фок-мачта треснула в трёх местах.

The dike might go any minute. — Дамбу может прорвать в любую минуту.

My old sweater had started to go at the elbows. — Мой старый свитер начал протираться на локтях.

The crop is good, but the potato is going everywhere. — Урожай зерновых хорош, а картофель начинает повсюду гнить.

to go to one's own place — умереть, скончаться

to go to a better world — перейти в лучший мир

to go to one's account — свести счёты с жизнью

Your brother's gone - died half-an-hour ago. — Ваш брат покинул этот мир - скончался полчаса назад.

Hope he hasn't gone down; he deserved to live. — Надеюсь, что он не умер; он заслужил того, чтобы жить.

The doctors told me that he might go off any day. — Доктора сказали мне, что он может скончаться со дня на день.

I hope that when I go out I shall leave a better world behind me. — Надеюсь, что мир станет лучше, когда меня не будет.

The space is too small, the bookcase won't go in. — Здесь слишком мало места, книжный шкаф сюда не войдёт.

Elzevirs go readily into the pocket. — Средневековые книги-эльзевиры легко входят в карман.

The thread is too thick to go into the needle. — Эта нитка слишком толста, чтобы пролезть в игольное ушко.

Three goes into fifteen five times. — Три содержится в пятнадцати пять раз.

All the good we can find about him will go into a very few words. — Всё хорошее, что мы в нём можем найти, можно выразить в нескольких словах.

This furniture would go well in any room. — Эта мебель подойдёт для любой комнаты.

I don't think these colours really go, do you? — Я не думаю, что эти цвета подходят, а ты как думаешь?

Oranges go surprisingly well with duck. — Апельсины отлично подходят к утке.

That green hat doesn't go with the blue dress. — Эта зелёная шляпа не идёт к синему платью.

Where is this blanket to go? — Куда положить это одеяло?

This box goes on the third shelf from the top. — Эта коробка стоит на третьей полке сверху.

This book goes here. — Эта книга стоит здесь (здесь её место).

He's short, as jockeys go. — Он довольно низкого роста, даже для жокея.

"How goes it, Joe?" - "Pretty well, as times go." — "Как дела, Джо?" - "По нынешним временам вполне сносно".

I'd like this letter to go first class. — Я хотел бы отправить это письмо первым классом.

This week's gone so fast - I can't believe it's Friday already. — Эта неделя прошла так быстро, не могу поверить, что уже пятница.

Time goes so fast when you're having fun. — Когда нам весело, время бежит.

Summer is going. — Лето проходит.

One week and half of another is already gone. — Уже прошло полторы недели.

Where did all their money go? — На что пошли все их деньги?

Whatever money he got it all went on paying his debt. — Сколько бы денег он ни получил, всё уходило на выплату долга.

Your money went towards a new computer for the school. — Ваши деньги пошли на новый компьютер для школы.

Not more than a quarter of your income should go in rent. — На арендную плату должно уходить не более четверти дохода.

We were worried because the food was completely gone and the water was going fast. — Мы беспокоились, так как еда уже кончилась, а вода подходила к концу.

The cake went fast. — Пирог был тут же съеден.

All its independence was gone. — Вся его независимость исчезла.

One of the results of using those drugs is that the will entirely goes. — Одно из последствий приёма этих лекарств - полная потеря воли.

This feeling gradually goes off. — Это чувство постепенно исчезает.

They can fire me, but I won't go quietly. — Они могут меня уволить, но я не уйду тихо.

to go cluck — кудахтать

to go bang — бахнуть, хлопнуть

to go crash / smash — грохнуть, треснуть

to go tang — зазвенеть

to go whirr — зажужжать

Clatter, clatter, went the horses' hoofs. — Цок, цок, цокали лошадиные копыта.

Something seemed to go snap within me. — Что-то внутри меня щёлкнуло.

Crack went the mast. — Раздался треск мачты.

Patter, patter, goes the rain. — Кап, кап, стучит дождь.

The clock on the mantelpiece went eight. — Часы на камине пробили восемь.

as the story goes — как говорят

Now the story goes that the young Smith is in London. — Говорят, что юный Смит сейчас в Лондоне.

How does that old saying go? — Как говорится в этой старой поговорке? Как это говорится?

My only order was, "Clear the road - and be damn quick about it." What I said went. — Я отдал приказ: "Очистить дорогу - и, чёрт возьми, немедленно!" Это тут же было выполнено.

He makes so much money that whatever he says, goes. — У него столько денег, что всё, что он ни скажет, тут же выполняется.

Around here, anything goes. — Здесь всё разрешено.

Anything goes if it's done by someone you're fond of. — Всё сойдёт, если это всё сделано тем, кого ты любишь.

She went about her work in a cold, impassive way. — Холодно, бесстрастно она приступила к своей работе.

How do you go about building a boat? — Как ты собираешься начать строить лодку?

Is the machine going now? — Машина в порядке?

The church clock has not gone for twenty years. — Часы на церкви не ходили двадцать лет.

All systems go. — Всё работает нормально.

She felt her heart go in a most unusual manner. — Она почувствовала, что сердце у неё очень странно бьётся.

to go cheap — продаваться по дешёвой цене

to go for nothing (something) — ничего не стоить (кое-что стоить)

to go for little — стоить немного

to go for a song — идти за бесценок, ничего не стоить

There were perfectly good coats going at $23! —Там продавали вполне приличные куртки всего за 23 доллара.

Going at four pounds fifteen, if there is no advance. — Если больше нет предложений, то продаётся за четыре фунта пятнадцать шиллингов.

This goes for 1 shilling. — Это стоит 1 шиллинг.

The house went for very little. — Дом был продан за бесценок.

Lewis consented to go as high as twenty-five thousand crowns. — Льюис согласился на такую большую сумму как двадцать пять тысяч крон.

I'll go fifty dollars for a ticket. — Я позволю себе купить билет за пятьдесят долларов.

to go somewhere — сходить в одно место

Half the guards went after the escaped prisoners, but they got away free. — На поиски беглецов отправилась половина гарнизона, но они всё равно сумели скрыться.

Jim intends to go after the big prize. — Джим намерен выиграть большой приз.

I think we should go after increased production this year. — Думаю, в этом году нам надо стремиться увеличить производство.

to go against the grain, go against the hair — вызывать внутренний протест, быть не по нутру

I wouldn't advise you to go against the director. — Не советую тебе перечить директору.

It goes against my nature to get up early in the morning. — Рано вставать по утрам противно моей натуре.

One of his many law-suits seemed likely to go against him. — Он, судя по всему, проигрывал один из своих многочисленных судебных процессов.

If the election goes against the government, who will lead the country? — Если на выборах проголосуют против правительства, кто же возглавит страну?

Our dog went at the postman again this morning. — Наша собака опять сегодня набросилась на почтальона.

Selina went at her again for further information. — Селина снова набросилась на неё, требуя дополнительной информации.

The students are really going at their studies now that the examinations are near. — Экзамены близко, так что студенты в самом деле взялись за учёбу.

When you go before the judge, you must speak the exact truth. — Когда ты выступаешь в суде, ты должен говорить чистую правду.

Your suggestion goes before the board of directors next week. — Совет директоров рассмотрит ваше предложение на следующей неделе.

to go behind the stereotypes — не ограничиваться стереотипами

The little girl was given a bar of chocolate as her payment for going between her sister and her sister's boyfriend. — Младшая сестра получила шоколадку за то, что была посыльной между своей старшей сестрой и её парнем.

The money that I won went beyond my fondest hopes. — Сумма, которую я выиграл, превосходила все мои ожидания.

Be careful not to go beyond your rights. — Будь осторожен, не превышай своих прав.

I was interested to hear the speaker, but his speech went beyond me. — Мне было интересно послушать докладчика, но его речь была выше моего понимания.

I don't think this class will be able to go beyond lesson six. — Не думаю, что этот класс сможет продвинуться дальше шестого урока.

to go by / under the name of — быть известным под именем

to go by a false name — скрываться под чужим именем

Our friend William often goes by Billy. — Нашего друга Вильяма часто называют Билли.

He went under the name of Baker, to avoid discovery by the police. — Скрываясь от полиции, он жил под именем Бейкера.

You can't go by what he says, he's very untrustworthy. — Не стоит судить о ситуации по его словам, ему нельзя верить.

You make a mistake if you go by appearances. — Ты ошибаешься, если судишь о людях по внешнему виду.

I go by the barometer. — Я пользуюсь барометром.

Our chairman always goes by the rules. — Наш председатель всегда действует по правилам.

I think we should go for increased production this year. — Думаю, в этом году нам надо стремиться увеличить производительность.

The people will never go for that guff. — Людям не понравится эта пустая болтовня.

Do you go for tall men? — Тебе нравятся высокие мужчины?

She doesn't go for whiskers. — Ей не нравятся бакенбарды.

The black cow immediately went for him. — Чёрная корова немедленно кинулась на него.

The speaker went for the profiteers. — Оратор обрушился на спекулянтов.

I'm well made all right. I could go for a model if I wanted. — У меня отличная фигура. Я могла бы стать манекенщицей, если бы захотела.

He goes for a lawyer, but I don't think he ever studied or practised law. — Говорят, он адвокат, но мне кажется, что он никогда не изучал юриспруденцию и не работал в этой области.

that goes for me — это относится ко мне; это мое дело

He wanted to go into Parliament. — Он хотел стать членом парламента.

He went eagerly into the compact. — Он охотно принял участие в сделке.

The Times has gone into open opposition to the Government on all points except foreign policy. — “Таймс” встал в открытую оппозицию к правительству по всем вопросам, кроме внешней политики.

the man who went into ecstasies at discovering that Cape Breton was an island — человек, который впал в экстаз, обнаружив, что мыс Бретон является островом

I nearly went into hysterics. — Я был на грани истерики.

He went keenly into dairying. — Он активно занялся производством молочных продуктов.

He went into practice for himself. — Он самостоятельно занялся практикой.

Hicks naturally went into law. — Хикс, естественно, занялся правом.

to go into long dresses, trousers, etc. — носить длинные платья, брюки

She shocked Mrs. Spark by refusing to go into full mourning. — Она шокировала миссис Спарк, отказываясь носить полный траур.

We cannot of course go into the history of these wars. — Естественно, мы не можем во всех подробностях рассмотреть историю этих войн.

I simply don't feel anything for him any more. In fact, I've gone off him. — Я просто не испытываю больше к нему никаких чувств. По существу, я его разлюбила.

The schoolboy goes over his lesson, before going up before the master. — Ученик повторяет свой урок, прежде чем отвечать учителю.

He went over the explanation two or three times. — Он повторил объяснение два или три раза.

We went over the house thoroughly before buying it. — Мы тщательно осмотрели дом, прежде чем купить его.

I've asked the garage people to go over my car thoroughly. — Я попросил людей в сервисе тщательно осмотреть машину.

Harry and I have been going over old letters. — Гарри и я просматривали старые письма.

We must go over the account books together. — Нам надо вместе проглядеть бухгалтерские книги.

It would take far too long to go through all the propositions. — Изучение всех предложений займёт слишком много времени.

All that men go through may be absolutely the best for them. — Все испытания, которым подвергается человек, могут оказаться для него благом.

The disease went through the whole city. — Болезнь распространилась по всему городу.

The girls were "going through" a drunken sailor. — Девицы обшаривали пьяного моряка.

He goes through three pairs of socks a week! — Он изнашивает до дыр три пары носков в неделю!

Why does not this artist go to nature? — Почему этот художник не обратится к природе?

She need not go to others for her bons mots. — Ей нет нужды искать у других остроумные словечки.

The house went to the elder son. — Дом достался старшему сыну.

The money I had saved went to the doctors. — Деньги, которые я скопил, пошли на докторов.

The dukedom went to his brother. — Титул герцога перешёл к его брату.

And the Oscar goes to… — Итак, «Оскар» достаётся…

These are the bones which go to form the head and trunk. — Это кости, которые формируют череп и скелет.

Whole gardens of roses go to one drop of the attar. — Для того, чтобы получить одну каплю розового масла, нужны целые сады роз.

This only goes to prove the point. — Это только доказывает утверждение.

Sixteen ounces go to the pound. — Шестнадцать унций составляют один фунт.

How many go to a crew with you, captain? — Из скольких человек состоит ваша команда, капитан?

Don't go to any trouble. — Не беспокойтесь.

Few publishers go to the trouble of giving the number of copies for an edition. — Немногие издатели берут на себя труд указать количество экземпляров издания.

The tenant went to very needless expense. — Арендатор пошёл на абсолютно ненужные расходы.

This word goes under G. — Это слово помещено под G.

Do you always go with the chairman? — Ты всегда заодно с председателем?

My sympathies went strongly with the lady. — Все мои симпатии были полностью на стороне леди.

Criminality habitually went with dirtiness. — Преступность и грязь обычно шли бок о бок.

The Court declared the deed a nullity on the ground that the mind of the mortgagee did not go with the deed she signed. — Суд признал документ недействительным на том основании, что кредитор по закладной не понимала содержания документа, который она подписала.

The "young ladies" he had "gone with" and "had feelin's about" were now staid matrons. — "Молодые леди", с которыми он "дружил" и к которым он "питал чувства", стали солидными матронами.

You see, this gave me something to go upon. — Видишь ли, это дало мне хоть что-то, с чего я могу начать.

I cannot bear to see things botched or gone upon with ignorance. — Я не могу видеть, как берутся за дела либо халтурно, либо ничего в них не понимая.

to go grey — седеть

to go missing — пропасть

He went dead about three months ago. — Он умер около трех месяцев назад.

She went pale. — Она побледнела.

He went bankrupt. — Он обанкротился.

to go mad — сойти с ума

to go sick — захворать

We both love going barefoot on the beach. — Мы оба любим ходить босиком по пляжу.

Most of their work seems to have gone unnoticed. — Кажется, большая часть их работы осталась незамеченной.

The powers could not allow such an act of terrorism to go unpunished. — Власти не могут допустить, чтобы террористический акт прошёл безнаказанно.

It seems as if it were going to rain. — Такое впечатление, что сейчас пойдёт дождь.

Lambs are to be sold to those who are going to keep them. — Ягнята должны быть проданы тем, кто собирается их выращивать.

The fool has gone and got married. — Этот дурак взял и женился.

He might go and hang himself for all they cared. — Он может повеситься, им на это абсолютно наплевать.

Oh, go and pick up pizza, for heaven's sake! — Ради бога, пойди купи, наконец, пиццу.

it goes without saying — само собой разумеется

to go against the grain — быть не по нутру

to go back a long way — давно знать друг друга, быть давними знакомыми

to go up in smoke — улетучиться

to go one's way — идти своим путём

to go from one's word — нарушить слово

to go right through — идти напролом

to go short — испытывать недостаток в чём-л.; находиться в стеснённых обстоятельствах

to go the way of nature / all the earth / all flesh / all living — скончаться, разделить участь всех смертных

to let oneself go — дать волю себе, своим чувствам

Go to Jericho / Bath / Hong Kong / Putney / Halifax! — Иди к чёрту! Убирайся!

He has been on the go since morning. — Он с утра на ногах.

The job requires a man with a lot of go. — Для этой работы требуется очень энергичный человек.

Physically, he is a wonderful man - very wiry, and full of energy and go. — Физически он превосходен - крепкий, полный энергии и напористости.

Believe me, it's all go with these tycoons, mate. — Поверь мне, приятель, это все деятельность этих заправил.

queer go, rum go — странное дело, странный поворот событий

And leave us to old Brown! that will be a nice go! — И оставь нас старику Брауну! это будет приятным сюрпризом!

to have a go at — попытаться

Let me have a go at fixing it. — Дай я попробую починить это.

Cost me five dollars the other day to see the tamest kind of a go. There wasn't a knockdown in ten rounds. — На днях я потратил пять долларов, чтобы увидеть самое мирное состязание. За десять раундов не было ни одного нокдауна.

bad go of snow-blindness — тяжёлый приступ снежной слепоты

go of fever — приступ лихорадки

all the go, quite the go — последний крик моды

first go — первым делом, сразу же

at a go — сразу

(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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• courant permanent admissible, m

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

• continuous 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

DE

• Dauerstrombelastbarkeit, f
• Strombelastbarkeit, f

FR

• courant admissible, m
• 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

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

• 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 I_Z
[ 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

• длительно допустимый ток
• допустимый ток

EN

• ampacity (US)
• continuous current
• continuous current-carrying capacity
• current-carrying capacity

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

• current capacity
• current-carrying capacity

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

• платы печатные

EN

• current-carrying capacity