-
1 cable code
English-German dictionary of Electrical Engineering and Electronics > cable code
-
2 cable code
<el> ■ Kabelkode m -
3 three-condition cable code
n TELECOM trivalenter Kabelcode mDictionary English-German Informatics > three-condition cable code
-
4 two-condition cable code
n COMP bivalenter Kabelcode mDictionary English-German Informatics > two-condition cable code
-
5 cable morse code
cable morse code Seekabelmorsecode m (Dreielementecode)English-German dictionary of Electrical Engineering and Electronics > cable morse code
-
6 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
-
7 overhead
1.['] adverb über mir/ihm/uns usw.2.['] adjective1)overhead wires — Hochleitung, die
overhead cable — Luftkabel, das
overhead projector — Overheadprojektor, der
2)3.overhead expenses/charges/costs — (Commerc.) Gemeinkosten Pl.
['] nounoverheads, (Amer.) overhead — (Commerc.) Gemeinkosten Pl.
* * *[əuvə'hed]adverb, adjective* * *over·headI. n[ˈəʊvəhed, AM ˈoʊvɚ-]1. (running costs of business)▪ \overheads pl BRIT, AUS▪ \overhead AM laufende Geschäftskosten, allgemeine Unkosten; (not chargeable to a particular product) indirekte KostenII. adj[ˈəʊvəhed, AM ˈoʊvɚ-]attr, inv1. (above head level) Hoch-\overhead cable Freileitung f, Luftkabel nt; (between towns) Überlandleitung f; (with high voltage) Hochspannungsleitung f2. (of running costs of business) laufend\overhead costs [or expenses] laufende Geschäftskosten, allgemeine Unkosten; (not chargeable to a particular product) indirekte Kosten\overhead shot Aufnahme f von oben4. SPORT Überkopf-III. adv[ˌəʊvəˈhed, AM ˌoʊvɚˈ-]in der Lufta plane circled \overhead ein Flugzeug kreiste über uns* * *I ["əʊvə'hed]1. advoben; (= in the sky position) am Himmel, in der Lufta plane flew overhead — ein Flugzeug flog über uns etc (acc) (hinweg)
2. adj['əʊvəhed]II ['əʊvəhed] (COMM)overhead railway (Brit) — Hochbahn f
1. adj2. n (US)See:= academic.ru/89708/overheads">overheads* * *A adv [ˌ-ˈhed]1. (dr)oben:the stars overhead die Sterne droben;“works overhead” „Vorsicht, Dacharbeiten!“B adj [ˈ-hed]overhead projector Overhead-, Tageslichtprojektor m;overhead transparency Folie f2. AUTOoverhead-valve engine oben gesteuerter Motorb) overhead camshaft oben liegende Nockenwelle4. SPORT Überkopf…:overhead stroke → C 2;C s [ˈ-hed]1. WIRTSCH Br meist pl Gemeinkosten pl* * *1.['] adverb über mir/ihm/uns usw.2.hear a sound overhead — ein Geräusch über sich (Dat.) hören
['] adjective1)overhead wires — Hochleitung, die
overhead cable — Luftkabel, das
overhead projector — Overheadprojektor, der
2)3.overhead expenses/charges/costs — (Commerc.) Gemeinkosten Pl.
['] nounoverheads, (Amer.) overhead — (Commerc.) Gemeinkosten Pl.
См. также в других словарях:
Code — redirects here. CODE may also refer to Cultural Olympiad Digital Edition. Decoded redirects here. For the television show, see Brad Meltzer s Decoded. For code (computer programming), see source code. For other uses, see Code (disambiguation).… … Wikipedia
Cable railings — or wire rope railings are safety rails that use horizontal or vertical cables in place of spindles, glass, mesh etc for infill. UsesThis type of railing is favored in areas where view of the landscape or ocean would be impaired by other types of… … Wikipedia
Code Correcteur — Un code correcteur est une technique de codage basée sur la redondance. Elle est destinée à corriger les erreurs de transmission d une information (plus souvent appelée message) sur une voie de communication peu fiable. La théorie des codes… … Wikipédia en Français
Cable, Ohio — Cable is an unincorporated community in central Wayne Township, Champaign County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 43009. [ [http://www.zipinfo.com/cgi local/zipsrch.exe?cnty=cnty… … Wikipedia
Code Private Hotel — (Abidjan,Кот д' Ивуар) Категория отеля: 3 звездочный отель Адрес: 01 BP 420 Ab … Каталог отелей
Code, California — Code is a former settlement in Kern County, California.[1] It was located on the Southern Pacific Railroad 4 miles (6.4 km) south southeast of Terese.[1] References ^ a b Durham, David L. (1998). California s Geographic Names: A Gazetteer of … Wikipedia
câblé — câblé, e adj. À la mode, dans le vent, bléca, branché, chébran, codé … Dictionnaire du Français argotique et populaire
codé — codé, e adj. À la mode, dans le vent ; branché ; chébran ; câblé … Dictionnaire du Français argotique et populaire
Cable ethernet — Ethernet Connecteur RJ45 pour Ethernet Pile de protocoles … Wikipédia en Français
Cable tray — A cable tray system, according to the US National Electrical Code, is a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways. Cable trays are used… … Wikipedia
Code Z — Le code Z (de même que le code Q) est un ensemble de codes utilisés pour les communications radio en morse ou en radiotélétype. En réalité, il existe différentes sortes de codes Z : la société Cable Wireless a développé des codes Z pour les… … Wikipédia en Français