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before+long

  • 1 длительный допустимый ток

    1. courant permanent admissible, m
    2. courant admissible, m

     

    (длительный) допустимый ток
    Максимальное значение электрического тока, который может протекать длительно по проводнику, устройству или аппарату при определенных условиях без превышения определенного значения их температуры в установившемся режиме
    [ ГОСТ Р МЭК 60050-826-2009]

    Этот ток обозначают IZ
    [ ГОСТ Р 50571. 1-2009 ( МЭК 60364-1: 2005)]

    EN

    (continuous) current-carrying capacity
    ampacity (US)
    maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value
    [IEV number 826-11-13]

    ampacity
    The current in amperes that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
    [National Electrical Cod]

    FR

    courant (permanent) admissible, m
    valeur maximale du courant électrique qui peut parcourir en permanence, un conducteur, un dispositif ou un appareil, sans que sa température de régime permanent, dans des conditions données, soit supérieure à la valeur spécifiée
    [IEV number 826-11-13]

    Ampacity, the term is defined as the maximum amount of current a cable can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, is the RMS electric current which a device can continuously carry while remaining within its temperature rating. The ampacity of a cable depends on:

    • its insulation temperature rating;
    • conductor electrical properties for current;
    • frequency, in the case of alternating currents;
    • ability to dissipate heat, which depends on cable geometry and its surroundings;
    • ambient temperature.

    Electric wires have some resistance, and electric current flowing through them causes voltage drop and power dissipation, which heats the cable. Copper or aluminum can conduct a large amount of current before melting, but long before the conductors melt, their insulation would be damaged by the heat.

    The ampacity for a power cable is thus based on physical and electrical properties of the material & construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the cable. Having a large overall surface area may dissipate heat well if the environment can absorb the heat.

    In a long run of cable, different conditions govern, and installation regulations normally specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Derating is necessary for multiple circuits in close proximity. When multiple cables are near, each contributes heat to the others and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in a nation's wiring regulations.

    Depending on the type of insulating material, common maximum allowable temperatures at the surface of the conductor are 60, 75 and 90 degrees Celsius, often with an ambient air temperature of 30°C. In the U.S., 105°C is allowed with ambient of 40°C, for larger power cables, especially those operating at more than 2 kV. Likewise, specific insulations are rated 150, 200 or 250°C.

    The allowed current in cables generally needs to be decreased (derated) when the cable is covered with fireproofing material.

    For example, the United States National Electric Code, Table 310-16, specifies that up to three 8 AWG copper wires having a common insulating material (THWN) in a raceway, cable, or direct burial has an ampacity of 50 A when the ambient air is 30°C, the conductor surface temperature allowed to be 75°C. A single insulated conductor in air has 70 A rating.

    Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. The acceptable magnitude and duration of overcurrent is a more complex topic than ampacity.

    When designing an electrical system, one will normally need to know the current rating for the following:

    Some devices are limited by power rating, and when this power rating occurs below their current limit, it is not necessary to know the current limit to design a system. A common example of this is lightbulb holders.

    [http://en.wikipedia.org/wiki/Ampacity]

    Тематики

    • электротехника, основные понятия

    Синонимы

    EN

    DE

    • Dauerstrombelastbarkeit, f
    • Strombelastbarkeit, f

    FR

    • courant admissible, m
    • courant permanent admissible, m

    Русско-французский словарь нормативно-технической терминологии > длительный допустимый ток

  • 2 рекультивация земель после завершения разработок

    1. remise en état de sites miniers

     

    рекультивация земель после завершения разработок

    [ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]

    EN

    mining site restoration
    Mining is an intensive type of land use with potential for environmental impact over a limited area. When closure occurs, it should address both environmental and safety aspects. Mine reclamation is an ongoing program designed to restore to an acceptable state the physical, chemical and biological quality or potential of air, land and water regimes disturbed by mining. The objective of mine reclamation is to prevent or minimize adverse long-term environmental impacts, and create a self-sustaining ecosystem as near as practicable to what existed before the mining activity. (Source: NRCAN)
    [http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]

    Тематики

    EN

    DE

    FR

    Русско-французский словарь нормативно-технической терминологии > рекультивация земель после завершения разработок

См. также в других словарях:

  • before long — {adv. phr.} In a short time; without much delay; in a little while, soon. * /Class will be over before long./ * /We were tired of waiting and hoped the bus would come before long./ …   Dictionary of American idioms

  • before long — {adv. phr.} In a short time; without much delay; in a little while, soon. * /Class will be over before long./ * /We were tired of waiting and hoped the bus would come before long./ …   Dictionary of American idioms

  • before long — adverb in the near future (Freq. 1) the doctor will soon be here the book will appear shortly she will arrive presently we should have news before long • Syn: ↑soon, ↑shortly, ↑ …   Useful english dictionary

  • before\ long — adv. phr. In a short time; without much delay; in a little while, soon. Class will be over before long. We were tired of waiting and hoped the bus would come before long …   Словарь американских идиом

  • before long — we ll be in Kentucky before long Syn: soon, shortly, presently, in the near future, in a little while, by and by, in a minute, in a moment, in a second; informal anon, in a jiffy; dated directly; literary ere long …   Thesaurus of popular words

  • before long — soon. I think we ll be finished with this before long …   New idioms dictionary

  • before long — soon She joined the company in 1995, and before long she was promoted to sales manager …   English dictionary

  • before long — Synonyms and related words: after a time, after a while, afterward, afterwards, anon, betimes, by and by, by destiny, directly, ere long, fatally, hopefully, imminently, in a moment, in a while, in aftertime, in due course, in due time, in the… …   Moby Thesaurus

  • before long — adverb Date: 1619 in the near future ; soon …   New Collegiate Dictionary

  • before long — pretty soon, within a short period of time …   English contemporary dictionary

  • before long — idi soon …   From formal English to slang

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