-
1 ablaufen
(unreg., trennb., -ge-)I v/i (ist)1. run ( oder flow) off; auch Badewasser: drain off; Flut: subside; ablaufen lassen (Wasser etc.) run off, drain off; (Geschirr etc.) drain, dry off; im Bad läuft das Wasser schlecht ab the bath(tub) isn’t draining properly; das läuft an ihm alles ab fig. it’s like water off a duck’s back2. (vonstatten gehen) go, pass off; planmäßig ablaufen go according to plan; reibungslos ablaufen go without a hitch; das Programm läuft automatisch ab the program runs automatically3. (ausgehen) turn out; für jemanden gut / schlecht ablaufen turn out well / badly for s.o.; wenn das nur gut abläuft! here’s hoping it’ll all work out alright ( oder OK)!; es lief nicht so ab wie erhofft it didn’t turn out (quite) as hoped4. (enden) Frist, Pass etc.: run out, expire; Amtszeit etc.: wind down; Vertrag: expire, be up; Wechsel: become due, mature6. Film: run; Tonband, CD: play; Faden: unreel, unwind; ablaufen lassen (Film) run, show; (Tonband etc.) play7. NAUT. (abdrehen) launchII v/t1. (hat) (Schuhe) wear out; (Absätze) wear down; sich (Dat) die Hacken ablaufen umg., fig. walk one’s legs off ( nach trying to find)2. (hat/ist) (Strecke) cover; suchend: scour; SPORT (Bahn) check out; alle Geschäfte ablaufen run (a)round all the shops (Am. stores); Rang 1* * *(abfließen) to drain away;(enden) to run out; to expire; to come to an end;(verlaufen) to go; to run down* * *ạb|lau|fen sep1. vtdie Beine or Hacken or Absätze or Schuhsohlen nach etw ablaufen (inf) — to walk one's legs off looking for sth
See:→ Horn2) aux sein or haben (= entlanglaufen) Strecke to go or walk over; (hin und zurück) to go or walk up and down; Stadt, Straßen, Geschäfte to comb, to scour (round)2. vi aux sein1) (=abfließen Flüssigkeit) to drain or run away or off; (= sich leeren Behälter) to drain (off), to empty (itself)aus der Badewanne ablaufen — to run or drain out of the bath
bei ablaufendem Wasser (Naut) — with an outgoing tide
an ihm läuft alles ab (fig) — he just shrugs everything off
2) (= vonstattengehen) to go offzuerst sah es sehr gefährlich aus, aber dann ist die Sache doch glimpflich abgelaufen — at first things looked pretty dangerous but it was all right in the end
3) (=sich abwickeln Seil, Kabel) to wind out, to unwind; (= sich abspulen Film, Tonband) to run; (Schallplatte) to playeinen Film ablaufen lassen — to run or show a film
ein Tonband ablaufen lassen — to run or play a tape
abgelaufen sein (Film etc) — to have finished, to have come to an end
4) (=ungültig werden Pass, Visum etc) to expire, to run out; (= enden Frist, Vertrag etc) to run out, to expire, to be updie Frist ist abgelaufen — the period has run out, the period is up
5) (=vergehen Zeitraum) to pass, to go by6) (SPORT = starten) to start* * *1) (to cease to exist, often because of lack of effort: His insurance policy had lapsed and was not renewed.) lapse2) ((of a limited period of time) to come to an end: His three weeks' leave expires tomorrow.) expire3) ((of a ticket, licence etc) to go out of date: My driving licence expired last month.) expire4) (to proceed, be done: The meeting went very well.) go5) ((of a clock, battery etc) to finish working: My watch has run down - it needs rewinding.) run down* * *ab|lau·fen1vi irreg Hilfsverb: sein1. (abfließen)das Badewasser \ablaufen lassen to let the bath water out, to empty the bath2. (sich leeren) to emptydas Wasser im Waschbecken läuft nicht ab the water won't drain out of the sink3. (trocken werden) to stand [to dry]nach dem Spülen lässt sie das Geschirr erst auf dem Trockengestell \ablaufen after washing up, she lets the dishes stand on the drainer4. (ungültig werden, auslaufen) to expire, to run out▪ abgelaufen expired5. (verstreichen, zu Ende gehen) to run outdas Ultimatum läuft nächste Woche ab the ultimatum will run out [or expire] [or end] next weekdas Verfallsdatum dieses Produkts ist abgelaufen this product has passed its sell-by date6. (vonstattengehen, verlaufen) to proceed, to run, to go [off]misch dich da nicht ein, die Sache könnte sonst ungut für dich \ablaufen! don't interfere — otherwise, it could bring you trouble!das Programm läuft ab wie geplant the programme ran as planned [or scheduleddas Kabel läuft von einer Rolle ab the reel pays out the cable▪ an jdm \ablaufen to wash over sban ihm läuft alles ab it's like water off a duck's back [with him]ab|lau·fen23. Hilfsverb: sein o haben (absuchen)ich habe den ganzen Marktplatz nach Avocados abgelaufen I've been all over the market looking for avocadossich dat die Beine [o Hacken] [o Schuhsohlen] nach etw dat \ablaufen (fam) to hunt high and low for sth* * *1.unregelmäßiges intransitives Verb; mit sein1) (abfließen) flow away; (herausfließen) run or flow out2) (herabfließen) run downvon/an etwas (Dat.) ablaufen — run off something
3) (verlaufen) pass or go offgut abgelaufen sein — have gone or passed off well
4) < alarm clock> run down; < parking meter> expire5) <period, contract, passport> expire6)2.ablaufen lassen — play < tape>; run < film> through
unregelmäßiges transitives Verb1) auch mit sein (entlanglaufen) walk all along; go over < area> on foot; (schnell) run all along2) (abnutzen) wear down* * *ablaufen (irr, trennb, -ge-)A. v/i (ist)im Bad läuft das Wasser schlecht ab the bath(tub) isn’t draining properly;das läuft an ihm alles ab fig it’s like water off a duck’s back2. (vonstatten gehen) go, pass off;planmäßig ablaufen go according to plan;reibungslos ablaufen go without a hitch;das Programm läuft automatisch ab the program runs automatically3. (ausgehen) turn out;für jemanden gut/schlecht ablaufen turn out well/badly for sb;wenn das nur gut abläuft! here’s hoping it’ll all work out alright ( oder OK)!;es lief nicht so ab wie erhofft it didn’t turn out (quite) as hoped4. (enden) Frist, Pass etc: run out, expire; Amtszeit etc: wind down; Vertrag: expire, be up; Wechsel: become due, mature5. Uhr: run down;Zeit ist abgelaufen fig your hour is come8. SCHIFF:B. v/tsich (dat)die Hacken ablaufen umg, fig walk one’s legs off (nach trying to find)* * *1.unregelmäßiges intransitives Verb; mit sein1) (abfließen) flow away; (herausfließen) run or flow out2) (herabfließen) run downvon/an etwas (Dat.) ablaufen — run off something
3) (verlaufen) pass or go offgut abgelaufen sein — have gone or passed off well
4) < alarm clock> run down; < parking meter> expire5) <period, contract, passport> expire6)2.ablaufen lassen — play < tape>; run < film> through
unregelmäßiges transitives Verb1) auch mit sein (entlanglaufen) walk all along; go over < area> on foot; (schnell) run all along2) (abnutzen) wear down* * *(Zeit) v.to elapse v. adj.rundown adj. v.to execute v.to pass v. -
2 werden
n; -s, kein Pl.; (Entwicklung) development, growth; (Entstehung) birth; (Fortschreiten) progress; im Werden sein be in the making* * *to arise; to get; to become; will; to grow* * *Wer|den ['veːɐdn]nt -s,no pl1) (= Entstehung) developmentim Wérden sein — to be in the making
die lebenden Sprachen sind immer im Wérden begriffen — living languages are in a state of continual development
* * *1) (to come or grow to be: Her coat has become badly torn; She has become even more beautiful.) become2) (to qualify or take a job as: She became a doctor.) become3) (to become: You're getting old.) get4) be5) ((of a photograph) to be developed: This photograph has come out very well.) come out6) (to become: These apples have gone bad.) go7) (to become: It's growing dark.) grow8) ((in certain phrases) to be or become: The river ran dry; My blood ran cold (= I was afraid).) run9) sour10) (to (cause to) change colour to: Her hair turned white; The shock turned his hair white.) turn11) (used to show willingness: I'll do that for you if you like; I won't do it!) will12) (used to state that something happens regularly, is quite normal etc: Accidents will happen.) will* * *Wer·den<-s>[ˈve:ɐ̯dn̩]nt kein pl (geh) developmentim \Werden sein to be in the making* * *1.unregelmäßiges intransitives Verb; mit sein; 2. PartEx:/Ex:1) become; getälter werden — get or grow old[er]
du bist aber groß/schlank geworden! — you've grown so tall/slim
wahnsinnig od. verrückt werden — go mad
rot werden — go or turn red
er ist 70 [Jahre alt] geworden — he has had his 70th birthday or has turned 70
heute soll es/wird es heiß werden — it's supposed to get/it's going to be hot today
mir wird übel/heiß/schwindelig — I feel sick/I'm getting hot/dizzy
Arzt/Vater werden — become a doctor/a father
Erster/Letzter werden — be or come first/last
eine werdende Mutter — a mother-to-be; an expectant mother
aus ihm ist nichts/etwas geworden — he hasn't got anywhere/has got somewhere in life
daraus wird nichts werden — nothing will come of it/that!
3) unperses wird [höchste] Zeit — it is [high] time
es wird Tag/Nacht/Herbst — day is dawning/night is falling/autumn is coming
4) (entstehen) come into existencees werde Licht — (bibl.) let there be light
5) (ugs.)sind die Fotos [was] geworden? — have the photos turned out [well]?
2.wirds bald? — (ugs.) hurry up!
Hilfsverb; 2. PartEx:/Ex:dir werd ich helfen! — (ugs.) I'll give you what for (sl.)
wir werden nächste Woche in Urlaub fahren — we are going on holiday next week; (als Ausdruck der Vermutung)
sie werden [wohl] im Garten sein — they are probably in the garden
er wird doch nicht [etwa] krank sein? — he wouldn't be ill, would he?
sie wird schon wissen, was sie tut — she must know what she's doing
er wurde gebeten/ist gebeten worden — he was asked
es wurde gelacht/gesungen/getanzt — there was laughter/singing/dancing
würden Sie bitte...? — would you please...?
* * *A. v/i (ist geworden)1. mit adj: get, become; Betonung auf dem Endzustand: oft go;müde/nass/reich etcwerden get tired/wet/rich etc;blind/kahl/verrückt/sauer/taub etcwerden go blind/bald/mad/sour/deaf etc;alt werden get ( oder grow) old;besser werden get better, improve;blass werden go ( oder turn) pale;wütend werden get angry ( oder mad);dick werden get fat, put on weight;gesund werden get well;kalt werden get cold (auch Essen etc);rot werden go red, blush;schlecht werden go bad ( oder off);schlimmer werden get worse;schwach werden get ( oder grow) weak;katholisch werden become a Catholic, turn Catholic2. (besonders etwas) become, be;was will er werden? what does he want to be?;er ist was/nichts geworden umg he made something of himself ( oder his life)/he never made anything of himself;er wird wie sein Vater (werden) he’s getting (to be) like his father;sie wird meine Frau she is going to be my wife;ich werde Vater/Großvater etc I’m going to be a father/grandfather etc;ich werde 30 I’m nearly 30;er wird heute 18 he’s 18 today;sie ist vorige Woche 50 geworden she was 50 last week;er ist Erster geworden he was ( oder came) first;3.Wirklichkeit werden become reality;zur Gewohnheit werden become a habit;zu einem reichen Mann/zu einem Star werden become a rich man/a star;die Vorräte werden immer weniger supplies are getting lower and lower;wie wird die Ernte werden? what kind of harvest are we going to have?;wie sind die Fotos geworden? how have the photos ( oder pictures) turned out?;die Fotos sind nichts geworden umg the photos ( oder pictures) were no good ( oder didn’t come out well); besonders wenn nichts erkennbar ist: the photos ( oder pictures) didn’t come out;der Wein/Kuchen etcist nichts geworden umg the wine/cake was no good;4. unpers:dunkel werden get (grow liter) dark;kalt werden get cold;warm werden get warm, warm up;es wird Winter winter is on its way;mir wird kalt I’m beginning to feel ( oder get) chilly;mir wird schlecht I feel sick;was soll nun werden? what are we going to do now?;ich weiß nicht, was werden soll I don’t know what to do;aus dem Geschäft ist nichts geworden nothing came of the deal;was ist aus ihm geworden? what’s become of him?;aus ihm ist nichts geworden he never got anywhere, he never made anything of himself;daraus wird nichts nothing will come of it, it won’t come to anything; als Verbot: you can forget (all) about that;es wird schon werden it’ll be all right;was nicht ist, kann noch werden umg things can change;B. v/aux (ist … worden)1. Futur:ich werde fahren I will ( oder I’ll) drive;sie wird gleich weinen she’s going to cry (any minute);es wird ihm doch nichts passiert sein? I hope nothing has happened to him;es wird schon so sein (wie du sagst) I’m sure you’re right;ich werde es (wohl) verloren haben I must have lost it2. Konditional:ich würde kommen, wenn … I would ( oder I’d) come if …3. passivisch:geliebt werden be loved;gebaut werden be built; gegenwärtig: be being built;es wird viel gebaut there’s a lot of building going on;es wurde getanzt they ( oder we) danced, there was dancing;es ist uns gesagt worden we’ve been told;jetzt wird aber geschlafen/gearbeitet! umg it’s time to sleep/to get down to work, it’s time you ( oder we) went to sleep/got down to work;jetzt wird nicht mehr geredet! umg no more talking now;heute wird nicht gestritten! umg today there are going to be no arguments!;und ward nicht mehr gesehn hum and was never seen again* * *1.unregelmäßiges intransitives Verb; mit sein; 2. PartEx:/Ex:1) become; getälter werden — get or grow old[er]
du bist aber groß/schlank geworden! — you've grown so tall/slim
wahnsinnig od. verrückt werden — go mad
rot werden — go or turn red
er ist 70 [Jahre alt] geworden — he has had his 70th birthday or has turned 70
heute soll es/wird es heiß werden — it's supposed to get/it's going to be hot today
mir wird übel/heiß/schwindelig — I feel sick/I'm getting hot/dizzy
Arzt/Vater werden — become a doctor/a father
Erster/Letzter werden — be or come first/last
eine werdende Mutter — a mother-to-be; an expectant mother
aus ihm ist nichts/etwas geworden — he hasn't got anywhere/has got somewhere in life
daraus wird nichts werden — nothing will come of it/that!
3) unperses wird [höchste] Zeit — it is [high] time
es wird Tag/Nacht/Herbst — day is dawning/night is falling/autumn is coming
4) (entstehen) come into existencees werde Licht — (bibl.) let there be light
5) (ugs.)sind die Fotos [was] geworden? — have the photos turned out [well]?
2.wirds bald? — (ugs.) hurry up!
Hilfsverb; 2. PartEx:/Ex:dir werd ich helfen! — (ugs.) I'll give you what for (sl.)
wir werden nächste Woche in Urlaub fahren — we are going on holiday next week; (als Ausdruck der Vermutung)
sie werden [wohl] im Garten sein — they are probably in the garden
er wird doch nicht [etwa] krank sein? — he wouldn't be ill, would he?
sie wird schon wissen, was sie tut — she must know what she's doing
er wurde gebeten/ist gebeten worden — he was asked
es wurde gelacht/gesungen/getanzt — there was laughter/singing/dancing
würden Sie bitte...? — would you please...?
* * *(Zukunft) aux.will aux. v.(§ p.,pp.: wurde, ist geworden)= to become v.(§ p.,p.p.: became, become)to grow v.(§ p.,p.p.: grew, grown) -
3 Werden
n; -s, kein Pl.; (Entwicklung) development, growth; (Entstehung) birth; (Fortschreiten) progress; im Werden sein be in the making* * *to arise; to get; to become; will; to grow* * *Wer|den ['veːɐdn]nt -s,no pl1) (= Entstehung) developmentim Wérden sein — to be in the making
die lebenden Sprachen sind immer im Wérden begriffen — living languages are in a state of continual development
* * *1) (to come or grow to be: Her coat has become badly torn; She has become even more beautiful.) become2) (to qualify or take a job as: She became a doctor.) become3) (to become: You're getting old.) get4) be5) ((of a photograph) to be developed: This photograph has come out very well.) come out6) (to become: These apples have gone bad.) go7) (to become: It's growing dark.) grow8) ((in certain phrases) to be or become: The river ran dry; My blood ran cold (= I was afraid).) run9) sour10) (to (cause to) change colour to: Her hair turned white; The shock turned his hair white.) turn11) (used to show willingness: I'll do that for you if you like; I won't do it!) will12) (used to state that something happens regularly, is quite normal etc: Accidents will happen.) will* * *Wer·den<-s>[ˈve:ɐ̯dn̩]nt kein pl (geh) developmentim \Werden sein to be in the making* * *1.unregelmäßiges intransitives Verb; mit sein; 2. PartEx:/Ex:1) become; getälter werden — get or grow old[er]
du bist aber groß/schlank geworden! — you've grown so tall/slim
wahnsinnig od. verrückt werden — go mad
rot werden — go or turn red
er ist 70 [Jahre alt] geworden — he has had his 70th birthday or has turned 70
heute soll es/wird es heiß werden — it's supposed to get/it's going to be hot today
mir wird übel/heiß/schwindelig — I feel sick/I'm getting hot/dizzy
Arzt/Vater werden — become a doctor/a father
Erster/Letzter werden — be or come first/last
eine werdende Mutter — a mother-to-be; an expectant mother
aus ihm ist nichts/etwas geworden — he hasn't got anywhere/has got somewhere in life
daraus wird nichts werden — nothing will come of it/that!
3) unperses wird [höchste] Zeit — it is [high] time
es wird Tag/Nacht/Herbst — day is dawning/night is falling/autumn is coming
4) (entstehen) come into existencees werde Licht — (bibl.) let there be light
5) (ugs.)sind die Fotos [was] geworden? — have the photos turned out [well]?
2.wirds bald? — (ugs.) hurry up!
Hilfsverb; 2. PartEx:/Ex:dir werd ich helfen! — (ugs.) I'll give you what for (sl.)
wir werden nächste Woche in Urlaub fahren — we are going on holiday next week; (als Ausdruck der Vermutung)
sie werden [wohl] im Garten sein — they are probably in the garden
er wird doch nicht [etwa] krank sein? — he wouldn't be ill, would he?
sie wird schon wissen, was sie tut — she must know what she's doing
er wurde gebeten/ist gebeten worden — he was asked
es wurde gelacht/gesungen/getanzt — there was laughter/singing/dancing
würden Sie bitte...? — would you please...?
* * *Werden n; -s, kein pl; (Entwicklung) development, growth; (Entstehung) birth; (Fortschreiten) progress;im Werden sein be in the making* * *1.unregelmäßiges intransitives Verb; mit sein; 2. PartEx:/Ex:1) become; getälter werden — get or grow old[er]
du bist aber groß/schlank geworden! — you've grown so tall/slim
wahnsinnig od. verrückt werden — go mad
rot werden — go or turn red
er ist 70 [Jahre alt] geworden — he has had his 70th birthday or has turned 70
heute soll es/wird es heiß werden — it's supposed to get/it's going to be hot today
mir wird übel/heiß/schwindelig — I feel sick/I'm getting hot/dizzy
Arzt/Vater werden — become a doctor/a father
Erster/Letzter werden — be or come first/last
eine werdende Mutter — a mother-to-be; an expectant mother
aus ihm ist nichts/etwas geworden — he hasn't got anywhere/has got somewhere in life
daraus wird nichts werden — nothing will come of it/that!
3) unperses wird [höchste] Zeit — it is [high] time
es wird Tag/Nacht/Herbst — day is dawning/night is falling/autumn is coming
4) (entstehen) come into existencees werde Licht — (bibl.) let there be light
5) (ugs.)sind die Fotos [was] geworden? — have the photos turned out [well]?
2.wirds bald? — (ugs.) hurry up!
Hilfsverb; 2. PartEx:/Ex:dir werd ich helfen! — (ugs.) I'll give you what for (sl.)
wir werden nächste Woche in Urlaub fahren — we are going on holiday next week; (als Ausdruck der Vermutung)
sie werden [wohl] im Garten sein — they are probably in the garden
er wird doch nicht [etwa] krank sein? — he wouldn't be ill, would he?
sie wird schon wissen, was sie tut — she must know what she's doing
er wurde gebeten/ist gebeten worden — he was asked
es wurde gelacht/gesungen/getanzt — there was laughter/singing/dancing
würden Sie bitte...? — would you please...?
* * *(Zukunft) aux.will aux. v.(§ p.,pp.: wurde, ist geworden)= to become v.(§ p.,p.p.: became, become)to grow v.(§ p.,p.p.: grew, grown) -
4 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
-
5 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
См. также в других словарях:
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