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1 длительный допустимый ток
- Strombelastbarkeit, f
- 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
Русско-немецкий словарь нормативно-технической терминологии > длительный допустимый ток
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2 остаточное количество воды
остаточное количество воды
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
residual amount of water
Amount of water left in a water course after it has fed a hydropower plant in order to maintain a satisfactory dry-weather-flow for allowing the survival of biotic communities. (Source: RRDA)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > остаточное количество воды
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3 влажность почвы
влажность почвы
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
soil moisture
1) Water stored in soils.
2) One of the most important elements involved in pedological processes and plant growth. There are three basic forms:
a) water adhering in thin films by molecular attraction to the surface of soil particles and not available for plants is termed hygroscopic water.
b) Water forming thicker films and occupying the smaller pore spaces is termed capillary water. Since it is held against the force of gravity it is permanently available for plant growth and it is this type of soil water which contains plant nutrients in solution.
c) Water in excess of hygroscopic and capillary water is termed gravitational water, which is of a transitory nature because it flows away under the influence of gravity. When the excess has drained away the amount of water retained in the soil is termed its field capacity, when some of its pore spaces are still free of water.
(Source: LANDY / DUNSTE)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > влажность почвы
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4 налог
налог
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]
налог
Обязательный, индивидуально безвозмездный платеж, взимаемый с организаций и физических лиц в форме отчуждения принадлежащих им на праве собственности, хозяйственного ведения или оперативного управления денежных средств в целях финансового обеспечения деятельности государства и (или) муниципальных образований. Совокупность налогов, сборов, пошлин и других платежей, взимаемых в установленном порядке, образует основу налоговой системы. См. также Налоги, Налоговая система.
[ http://slovar-lopatnikov.ru/]EN
tax
An amount of money demanded by a government for its support or for specific facilities or services, most frequently levied upon income, property or sales. (Source: RHW)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > налог
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5 обработка газа
обработка газа
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
treatment of gases
Gas is treated before it can be supplied to the marketplace. The extent to which gas needs to be processed will depend on its quality, the amount of associated impurities such as water, carbon dioxide and sulphur compounds, and the ultimate end-use for the gas. Common gaseous impurities found in natural gas are carbon dioxide and sulphur compounds. Both have an acidic reaction and are given the generic name 'acid gases'. These gases can be removed by a number of commercial processes, using either a physical or a chemical solvent. Physical solvent processes tend to be used where gas pressures are high and for gases with lower levels of propane and heavier hydrocarbons. (Source: SHELL)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > обработка газа
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6 допустимая суточная норма потребления
допустимая суточная норма потребления
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
acceptable daily intake
The measurement of the amount of any chemical substance that can be safely consumed by a human being in a day. Calculations are usually based on the maximum level of a substance that can be fed to animals without producing any harmful effects. This is divided by a "safety factor" to allow for the differences between animals and humans and to take account of the variation in human diets. (Source: WRIGHT)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > допустимая суточная норма потребления
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7 запасы газа
запасы газа
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
gas supply
The provision and storage of any fuel gas, or the amount of any fuel gas stored, for the use of a municipality, or other fuel gas user. (Source: ISEP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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DE
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Русско-немецкий словарь нормативно-технической терминологии > запасы газа
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8 запасы энергии
запасы энергии
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
energy storage
Amount of energy reserves; often refers to the stocks of non-renewable fuel, such as oil, which a nation, for example, possesses. (Source: PHC)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > запасы энергии
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9 местное теплоснабжение
местное теплоснабжение
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
local heat supply
The provision of heating fuel, coal or other heating source materials, or the amount of heating capacity, for the use of a specific local community. (Source: ISEP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > местное теплоснабжение
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10 обеспечение питьевой водой
обеспечение питьевой водой
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
drinking water supply
The provision and storage of potable water, or the amount of potable water stored, for the use of a municipality, or other potable water user. (Source: ISEP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > обеспечение питьевой водой
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11 обеспечение теплом
обеспечение теплом
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
heat supply
The provision of heating fuel, coal or other heating source materials, or the amount of heating capacity, for the use of a municipality, or other heat user. (Source: ISEP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > обеспечение теплом
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12 обслуживание долга (фин.-экон.)
обслуживание долга (фин.-экон.)
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
debt service
The fees or amount of money necessary to pay interest on an outstanding debt, the principal of maturing serial bonds, and the required contributions to an amortization or sinking fund for term bonds. (Source: EFP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > обслуживание долга (фин.-экон.)
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13 пролив Ваддензе
пролив Ваддензе
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
Wadden Sea
The Wadden sea is a shallow sea extending along the North Sea coasts of The Netherlands, Germany and Denmark. It is a highly dynamic ecosystem with tidal channels, sands, mud flats, salt marshes, beaches, dunes, river mouths and a transition zone to the North Sea, the offshore zone. Most parts of the Wadden Sea, in particular in The Netherlands and Lower Saxony, are sheltered by barrier islands and contain smaller or wider areas of intertidal flats. The present form of the Wadden Sea is the result of both natural forces and action by man. Twice a day, on average, 15 km3 of sea water enter the Wadden sea. With the water from the North Sea, large amount of sand and silt are imported which settle in places with little water movement. During low tides large parts of the Wadden Sea emerge. These so-called tidal flats cover about 2/3 of the tidal area and are one of its most characteristic features. Nowhere in the world can such a large unbroken stretch of tidal flats be found. They account for 60% of all tidal areas in Europe and North Africa. (Source: CWSS)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > пролив Ваддензе
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14 расходы на поездку
расходы на поездку
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
travel cost
Expenditure of money or the amount of money incurred for journeying or going from one place to another by some mode of transportation. (Source: ISEP / RHW)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > расходы на поездку
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15 снабжение энергией
снабжение энергией
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
energy supply
The provision and storage of energy (the capacity to do work or produce a change), or the amount of energy stored, for the use of a municipality, or other energy user. (Source: ISEP / FFD)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > снабжение энергией
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16 снижение расходов
снижение расходов
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
cost reduction
The lessening or lowering in the amount of money incurred or asked for in the exchange of goods and services. (Source: ISEP / EFP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > снижение расходов
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17 увеличение расходов
увеличение расходов
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
cost increase
The augmentation or rise in the amount of money incurred or asked for in the exchange of goods and services. (Source: ISEP / EFP)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
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Русско-немецкий словарь нормативно-технической терминологии > увеличение расходов
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