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1 Panzerabwehrstützpunkt
milit. PÄSt.Универсальный русско-немецкий словарь > Panzerabwehrstützpunkt
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2 бастурма
ngastron. Pastı, rma -
3 археологическая площадка
археологическая площадка
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
archaeological site
Any location containing significant relics and artifacts of past culture. (Source: LANDY)
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Русско-немецкий словарь нормативно-технической терминологии > археологическая площадка
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4 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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5 импактор
импактор
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
impactor
Instrument which samples atmospheric suspensoids by impaction; such instruments consist of a housing which constrains the air flow past a sensitized sampling plate. (Source: MGH)
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Русско-немецкий словарь нормативно-технической терминологии > импактор
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6 ископаемое
ископаемое
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
fossil
Any remains, trace, or imprint of a plant or animal that has been preserved in the Earth's crust since some past geologic or prehistoric time. (Source: BJGEO)
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Русско-немецкий словарь нормативно-технической терминологии > ископаемое
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7 исчезающий вид
исчезающий вид
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
category of endangered species
Those of the planet's flora and fauna which are threatened with extinction. Hunting and poaching to fuel the trade in ivory, horn, skins, fur and feathers have long been a threat to already endangered species. Pollution, agricultural expansion, loss of wetlands, deforestation and other erosion of habitats have been added to the hazards. Human activity was responsible for most of the animals and plants known to have been lost in the past two centuries. (Source: WRIGHT)
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Русско-немецкий словарь нормативно-технической терминологии > исчезающий вид
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8 народная традиция
народная традиция
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
folk tradition
The common beliefs, practices, customs and other cultural elements of an ethnic or social group that are rooted in the past, but are persisting into the present due to means such as arts and crafts, songs and music, dance, foods, drama, storytelling and certain forms of oral communication. (Source: VFP)
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Русско-немецкий словарь нормативно-технической терминологии > народная традиция
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9 ответственность правительства
ответственность правительства
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
government liability
A public body's debt or other legal obligation arising out of transactions in the past which must be liquidated, renewed or refunded at some future date. (Source: EFP)
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Русско-немецкий словарь нормативно-технической терминологии > ответственность правительства
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10 разрушение озонового слоя
разрушение озонового слоя
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
ozone layer depletion
The fragile shield of ozone is been damaged by chemicals released on earth. The main chemicals that are depleting stratospheric ozone are chlorofluorocarbons which are used in refrigerators, aerosols, and as cleaners in many industries, and halons, which are used in fire extinguishers. The damage is caused when these chemicals release highly reactive forms of chlorine and bromine. Over the past 30 years ozone levels over parts of Antarctica have dropped by almost 40% during some months and a "hole" in ozone concentrations is clearly visible in satellite observations. (Source: WRIGHT)
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Русско-немецкий словарь нормативно-технической терминологии > разрушение озонового слоя
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11 семейное положение
семейное положение
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
marital status
The standing of an individual with regard to a legally recognized conjugal relationship, either in the present or past. (Source: RHW)
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Русско-немецкий словарь нормативно-технической терминологии > семейное положение
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12 смертельные болезни рыб
смертельные болезни рыб
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
fish kill
Fish diseases observed in the past three decades and which have been attributed to pollution include: haemorrhages; tumours; fin rot; deformed fins; and missing scales and tails. In industrialized countries, increasing numbers of fish are deemed inedible. Many small kills are not noticed or are not reported, and large kills are often not included because of insufficient information to determine whether the kills were caused by pollution or by natural factors. Low dissolved oxygen levels resulting from excessive sewage is one of the leading causes. The second most common cause is pesticides. (Source: WPR)
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Русско-немецкий словарь нормативно-технической терминологии > смертельные болезни рыб
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13 циркуляция морской воды
циркуляция морской воды
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
sea circulation
Large-scale horizontal water motion within an ocean. The way energy from the sun, stored in the sea, is transported around the world. The currents explain, for example, why the UK has ice-free ports in winter, while St. Petersburg, at the same latitude as the Shetland Islands, needs ice breakers. Evidence is growing that the world's ocean circulation was very different during the last ice age and has changed several times in the distant past, with dramatic effects on climate. The oceans are vital as storehouses, as they absorb more than half the sun's heat reaching the earth. This heat, which is primarily absorbed near the equator is carried around the world and released elsewhere, creating currents which last up to 1.000 years. As the Earth rotates and the wind acts upon the surface, currents carry warm tropical water to the cooler parts of the world. The strength and direction of the currents are affected by landmasses, bottlenecks through narrow straits, and even the shape of the sea-bed. When the warm water reaches polar regions its heat evaporates into the atmosphere, reducing its temperature and increasing its density. When sea-water freezes it leaves salt behind in the unfrozen water and this cold water sinks into the ocean and begins to flow back to the tropics. Eventually it is heated and begins the cycle all over again. (Source: MGH / WRIGHT)
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Русско-немецкий словарь нормативно-технической терминологии > циркуляция морской воды
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14 экологическая хронология
экологическая хронология
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
environmental history
A systematic and chronological account of past events and conditions relating to the ecosystem, its natural resources or, more generally, the external factors surrounding and affecting human life. (Source: TOE)
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Русско-немецкий словарь нормативно-технической терминологии > экологическая хронология
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15 экономическая география
экономическая география
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
economic geography
The geography of people making a living, dealing with the spatial patterns of production, distribution and consumption of goods and services. The development of economic geography over the past three decades has witnessed the substitution of analysis for description, leading to an identification of the factors and an understanding of the processes affecting the spatial differentiation of economic activities over the earth's surface. (Source: GOOD)
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Русско-немецкий словарь нормативно-технической терминологии > экономическая география
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