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1 длительный допустимый ток
(длительный) допустимый ток
Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
[ ГОСТ Р МЭК 60050-826-2009]
Этот ток обозначают IZ
[ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]EN
(continuous) current-carrying capacity
ampacity (US)
maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
[IEV number 826-11-13]
ampacity
The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[National Electrical Cod]FR
courant (permanent) admissible, m
valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
[IEV number 826-11-13]Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:
- its insulation temperature rating;
- conductor electrical properties for current;
- frequency, in the case of alternating currents;
- ability to dissipate heat, which depends on cable geometry and its surroundings;
- ambient temperature.
Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.
The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.
In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.
Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.
The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.
For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.
Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.
When designing an electrical system, one will normally need to know the current rating for the following:- Wires
- Printed Circuit Board traces, where included
- Fuses
- Circuit breakers
- All or nearly all components used
Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.
[http://en.wikipedia.org/wiki/Ampacity]
Тематики
- электротехника, основные понятия
Синонимы
EN
DE
- Dauerstrombelastbarkeit, f
- Strombelastbarkeit, f
FR
- courant admissible, m
- courant permanent admissible, m
Русско-английский словарь нормативно-технической терминологии > длительный допустимый ток
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2 злоба дня
1) General subject: Topic A, a nine days' wonder, a nine days' wonder, a nine-days wonder, nine days' wonder, topic of the day, a nine-day wonder (сокр. вариант пословицы 'a wonder lasts but nine days, and then the puppy's eyes are open'), hot news, latest news, current concern, present-day concern2) Makarov: main topic of the day, the main topic of the day -
3 актуальный вопрос
1) General subject: conversational question, live issue, pressing matter, pressing problem, pressing question, question of present interest, question of the hour, the question of the hour, topical matter, topical problem, topical question, urgent issue, urgent matter, urgent problem, topical issue (АД), topic of interest, highlight2) Mathematics: vital question3) Law: urgent question4) Politics: pressing theme, pressing topic, lightening-rod issue, immediate issue, important issue, pressing issue, relevant issue, topical issue5) Jargon: the question of the day6) Advertising: relevant question7) Business: current question8) Makarov: burning question -
4 вопрос
1) questionзабросать кого-л. вопросами — to assail / to bombard / to deluge / to hammer / to shower smb. with questions; to fire / to fling / to hurl questions at smb.; (каверзными) to heckle
задать вопрос — to ask / to put a questien
предлагать / просить задавать вопросы — to invite questions
засыпать вопросами — to bombard / to deluge (smb.) with questions, to heap questions (upon smb.)
обменяться мнениями по широкому кругу вопросов — to exchange views / opinions ona wide range of questions
ответить вопросом на вопрос — to counter with another question, to parry a question
осаждать вопросами — to ply smb. with questions
подсказывать вопросы дружественно настроенным журналистам (чтобы задавать их на пресс-конференции) — to plant questions with friendly journalists
предложить кому-л. вопрос — to put a question to smb.
сформулировать вопрос — to formulate / to frame a question
уйти / уклониться от вопроса — to evade / to skirt a question, to shy away from a question
вопрос сводится к следующему... — the question resolves itself into this...
неожиданный вопрос — unexpected / off-the-wall question
прямой / категорический вопрос — point-blank / straight / direct question
вопрос, допускающий разное толкование / разные ответы — open-ended question
вынести вопрос на обсуждение / рассмотрение — to submit a question for discussion / consideration
вопрос следует вынести на обсуждение — the matter requires discussion / ventilation
время, отведённое на вопросы и ответы — question and answer period
форма чьего-л. вопроса — the way one is framing bis question
2) (проблема) question, problem, issue; (дело) point, matterбиться над вопросом — to wrestle with a question / a problem
внести ясность в вопрос — to clear / to clarify / to brighten / to elucidate a question
вступить с кем-л. в спор по какому-л. вопросу — to take issue with smb. on smth.
выяснять вопрос — to clear up / to sort out a matter / a question, to clarify a point / an issue
добраться до существа / сути вопроса — to go to the heart of a question
договориться по основным вопросам — to agree on / upon fundamentals
заниматься каким-л. вопросом — to deal with a matter / a problem
запутать вопрос — to confuse an issue; to entangle a question / an issue; to involve a question in difficulty
затрагивать вопрос — to broach / to touch upon a question
излагать вопрос — to state a question / an issue; to set forth an issue
изучать какой-л. вопрос — to go into / to study a question, to explore a problem, to see into a matter
всесторонне изучить вопрос — to study a question from every side / from all sides
исключать вопрос — to discard / to exclude a question
не иметь отношения к вопросу — to have nothing to do with a question, to be foreign to a question
обдумывать вопрос — to think over a question / a matter, to meditate / to contemplate a problem
обратиться к кому-л. по данному вопросу — to approach smb. on the matter
обсуждать вопрос — to discuss / to dispute a question / a matter, to debate an issue / a matter / a point
обходить вопрос — pass over / to side-step a question / an issue
оставить вопрос открытым — to leave the question / the matter open, to keep / to leave the matter in abeyance
остановиться на вопросе — to dwell (up)on a question, to take up a point
отделить вопрос от чего-л. — to separate a question from smth.
отклониться / отойти от вопроса — to depart / to deviate / to digress from the question
поднимать / ставить вопрос — to bring up / to open / to raise a question, to broach an issue / a subject
поставить вопрос на обсуждение — to introduce a question for debate / for discussion
поставить перед кем-л. вопрос — to put a point before smb.
представить / рассмотреть вопрос в истинном свете — to place a question in its true perspective
представлять кому-л. вопрос на обсуждение / рассмотрение — to submit a question to smb. for consideration
прекратить обсуждение вопроса — to dismiss an issue / a problem
приступить к обсуждению / рассмотрению вопроса — to enter into an examination / upon ventilation of a question / an issue
проанализировать вопрос — to analyse an issue / a problem
продолжать обсуждение какого-л. вопроса — to pursue a point
осветить какой-л. вопрос — to elucidate a question / a matter; to throw light at a question; to shed light on a problem
просветить кого-л. в каком-л. вопросе — to enlighten smb. on a subject
разобраться в каком-л. вопросе до конца — to sift a question to the bottom
разработать вопрос — to elaborate a point, to work out a problem
разрешить вопрос — to solve / to resolve a problem
пытаться разрешить вопрос — to grapple with a question / a problem
распространяться по какому-л. вопросу разг. — to enlarge upon a point / a theme
рассматривать вопрос — to consider / to examine a question / an issue / a problem
растолковать кому-л. вопрос — to drive home a point to smb.
расходиться во мнениях по какому-л. вопросу — to split on a question / an issue
решать вопрос — to handle a problem / a matter, to tackle / to resolve an issue
сводить вопрос к чему-л. — to boil down a problem to smth.
вопрос сводится к следующему — the question boils down / reduces itself to the following
сосредоточиться на вопросе — to focus on a question / a problem
столкнуться с вопросом — to confront with / to face (with) a question / a problem
считать вопрос решённым — to regard / to consider the matter as closed
уводить обсуждение от существа вопроса — to sidetrack an issue / a problem
уклоняться от обсуждения вопроса — to side-step / to duck an issue; to skirt a question
усложнять вопрос — to complicate a question / a problem
уходить от решения вопроса — to dodge a problem / an issue
вопрос надо поставить иначе / вновь — the question needs to be restated
актуальный вопрос — topical / pressing / vital question, matter of current / topical interest
больной / наболевший вопрос — sore point / subject
(очень) важный вопрос — (very) important question / matter; question of (great / crucial) importance, overriding issue, substantial point
внешнеполитический вопрос — question / issue of foreign policy
основные внешнеполитические вопросы — major / crucial issue of foreign policy
внутренний вопрос (страны и т.п.) — internal problem
второстепенный вопрос — minor question / issue, side issue
главный вопрос — crucial / pivotal question, main / major issue / problem / question / point
гуманитарные вопросы — humanitarian matters / concerns
деликатный вопрос — delicate question / problem / matter
жгучий вопрос — burning question, hot issue
животрепещущий / жизненно важный вопрос — vital issue / question; issue / question of vital importance
запутанный вопрос — knotty / intricate question, tricky problem / question
злободневный вопрос — burning / pressing question, burning topic of the day, hot issue
коренные вопросы — fundamental questions / problems
насущный вопрос — question of vital importance, urgent / vital question, vital / bread-and-butter issue
находящийся на рассмотрении вопрос — pending question, question under consideration
национальный вопрос — national / nationalities question, problem of nationalities
неотложный вопрос — pressing / urgent question / matter; issue at hand
неразрешённый вопрос — unsolved problem, outstanding issue / problem / question, unresolved / unsolved / open question
неразрешимый / нерешённый вопрос — insol-vable / unresolvable question
основной вопрос — fundamental / leading / primal question, basic / key / main issue, key / main problem / question
первоочередной вопрос — overriding issue / problem, top-priority issue, matter of priority
правовой / юридический вопрос — legal issue
принципиальный вопрос — matter / question of principle
процедурный вопрос — procedural matter, point of order
существенный / связанный с существом дела вопрос (в отличие от процедурного) — substantive issue / question, matter of substance
сложный вопрос — complicated question / matter; knotty / thomy problem; complex issue / question
согласованный вопрос (обсуждения, переговоров и т.п.) — agreed subject
спорный / дискуссионный вопрос — controversial / vexed question; contentious issue; moot / debating point; point at issue; debatable / disputable / question / point
выступать за решение спорных вопросов путём переговоров — to advocate the settlement of disputable / controversial issues by negotiations
стоящий перед кем-л. вопрос — problem facing smb.
щекотливый вопрос — delicate / sensitive issue; ticklish problem
вопросы, входящие во внутреннюю компетенцию государства — matters which are within the domestic jurisdiction of a state
вопрос, касающийся определения (какого-л. вида оружия и т.п.) — definition question
вопрос, не заслуживающий внимания — matter of small weight
вопрос, не относящийся к теме / делу — question remote from the subject
вопросы, относящиеся к данному делу — questions pertinent to the matter in hand
вопрос первоочерёдной / первостепенной важности — matter of the highest / of urgent priority
вопрос, по которому спорящие стороны сходятся во мнениях — common ground
вопрос, по которому существуют разногласия — area of disagreement
вопрос по существу — point of substance; pertinent question
перейти к вопросу по существу — to come. to the merits / substance of the matter
вопрос, представляющий взаимный интерес — question / matter of mutual interest / concern, issue of common concern / interest
вопрос, решение которого зашло в тупик — deadlocked issue
вопросы, требующие обсуждения (особ. публичного) — questions calling for ventilation
вопрос, уводящий в сторону от главной темы — red herring
вопрос, чреватый серьёзными последствиями — far-reaching question
круг вопросов, решаемых президентом — executive discretion амер.
перечень вопросов, подлежащих рассмотрению в первую очередь — priority list of topics
выступать / говорить по существу вопроса — to speak to the question / point
широкий круг вопросов — wide range of questions / problems
широкий круг вопросов, охватываемый проектом резолюции — broad scope of a draft resolution
3) (пункт) itemвключить вопрос в повестку дня — to include an item in the agenda / in the order of the day
вопрос (повестки дня), переданный на рассмотрение комитета — item allocated / referred to the Committee
вопрос, рекомендуемый для включения в повестку дня — item recommended for inclusion
очерёдность / порядок вопросов — order of priority
4)поставить что-л. под вопрос — to call smth. in question; to question the necessity / validity of smth.
под (большим) вопросом — subject to doubt; problematic
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