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1 длительный допустимый ток
- courant permanent admissible, m
- 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:- 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-французский словарь нормативно-технической терминологии > длительный допустимый ток
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2 seating
seating ['si:tɪŋ]noun (UNCOUNT)∎ the seating isn't very comfortable les sièges ne sont pas très confortables(b) (sitting accommodation) places fpl (assises);∎ there's additional seating at the back il y a des places (assises) supplémentaires au fond;∎ there's seating for three hundred in the hall il y a trois cents places dans la salle;∎ there's seating for eight round this table on peut asseoir huit personnes autour de cette table∎ who's in charge of the seating? qui est chargé de placer les gens?►► seating accommodation nombre m de places assises;∎ the hall has seating accommodation for eight hundred people la salle a une capacité de huit cents places (assises);seating arrangements le placement ou la disposition des gens;seating capacity nombre m de places assises;∎ the theatre has a seating capacity of five hundred il y a cinq cents places dans le théâtre; -
3 strike
strike [straɪk]grève ⇒ 1 (a) raid ⇒ 1 (b) attaque ⇒ 1 (b) escadre ⇒ 1 (c) découverte ⇒ 1 (d) sonnerie ⇒ 1 (e) frapper ⇒ 3 (a), 3 (c)-(e), 3 (n), 4 (a) toucher ⇒ 3 (a) atteindre ⇒ 3 (a) heurter ⇒ 3 (b) sonner ⇒ 3 (f), 4 (d) jouer ⇒ 3 (g) conclure ⇒ 3 (h) rendre ⇒ 3 (j) découvrir ⇒ 3 (l) attaquer ⇒ 3 (q), 4 (b) faire grève ⇒ 4 (c)1 noun∎ to go on strike se mettre en ou faire grève;∎ to be (out) on strike être en grève;∎ to threaten strike action menacer de faire ou de se mettre en grève;∎ the Italian air strike la grève des transports aériens en Italie;∎ railway strike grève f des chemins de fer;∎ teachers' strike grève f des enseignants;∎ coal or miners' strike grève f des mineurs;∎ postal or post office strike grève f des postes;∎ rent strike grève f des loyers∎ to carry out air strikes against or on enemy bases lancer des raids aériens contre des bases ennemies;∎ retaliatory strike raid m de représailles; (nuclear) deuxième frappe f∎ a gold strike la découverte d'un gisement d'or;∎ the recent oil strikes in the North Sea la découverte récente de gisements de pétrole en mer du Nord;∎ it was a lucky strike c'était un coup de chance(e) (of clock → chime, mechanism) sonnerie f;∎ life was regulated by the strike of the church clock la vie était rythmée par la cloche de l'église∎ the strike of iron on iron le bruit du fer qui frappe le fer;∎ he adjusted the strike of the keys on the platen roll il a réglé la frappe des caractères contre le cylindre∎ figurative he has two strikes against him il est mal parti;∎ figurative being too young was another strike against her le fait d'être trop jeune constituait un handicap supplémentaire pour elle(h) (in bowling) honneur m double;∎ to get or to score a strike réussir un honneur double∎ at the strike of day à la pointe ou au point du jour(a) (committee, movement) de grève∎ she raised her hand to strike him elle leva la main pour le frapper;∎ he struck me with his fist il m'a donné un coup de poing;∎ the chairman struck the table with his gavel le président donna un coup de marteau sur la table;∎ she took the vase and struck him on or over the head elle saisit le vase et lui donna un coup sur la tête;∎ she struck him across the face elle lui a donné une gifle;∎ a light breeze struck the sails une légère brise gonfla les voiles;∎ the phenomenon occurs when warm air strikes cold ce phénomène se produit lorsque de l'air chaud entre en contact avec de l'air froid;∎ a wave struck the side of the boat une vague a heurté le côté du bateau;∎ the arrow struck the target la flèche a atteint la cible;∎ a hail of bullets struck the car la voiture a été mitraillée;∎ he was struck by a piece of shrapnel il a été touché par ou il a reçu un éclat de grenade;∎ to be struck by lightning être frappé par la foudre, être foudroyé;∎ he went for them striking blows left and right il s'est jeté sur eux, distribuant les coups de tous côtés;∎ who struck the first blow? qui a porté le premier coup?, qui a frappé le premier?;∎ he struck the tree a mighty blow with the axe il a donné un grand coup de hache dans l'arbre;∎ the trailer struck the post a glancing blow la remorque a percuté le poteau en passant;∎ figurative to strike a blow for democracy/women's rights (law, event) faire progresser la démocratie/les droits de la femme; (person, group) marquer des points en faveur de la démocratie/des droits des femmes(b) (bump into, collide with) heurter, cogner;∎ his foot struck the bar on his first jump son pied a heurté la barre lors de son premier saut;∎ she fell and struck her head on or against the kerb elle s'est cogné la tête contre le bord du trottoir en tombant;∎ the Volvo struck the bus head on la Volvo a heurté le bus de plein fouet;∎ Nautical we've struck ground! nous avons touché (le fond)!(c) (afflict → of drought, disease, worry, regret) frapper; (→ of storm, hurricane, disaster, wave of violence) s'abattre sur, frapper;∎ an earthquake struck the city un tremblement de terre a frappé la ville;∎ he was struck by a heart attack il a eu une crise cardiaque;∎ the pain struck her as she tried to get up la douleur l'a saisie au moment où elle essayait de se lever;∎ I was struck by or with doubts j'ai été pris de doute, le doute s'est emparé de moi(d) (occur to) frapper;∎ only later did it strike me as unusual ce n'est que plus tard que j'ai trouvé ça ou que cela m'a paru bizarre;∎ it suddenly struck him how little had changed il a soudain pris conscience du fait que peu de choses avaient changé;∎ did it never strike you that you weren't wanted there? ne vous est-il jamais venu à l'esprit que vous étiez de trop?;∎ a terrible thought struck her une idée affreuse lui vint à l'esprit;∎ it strikes me as useless/as the perfect gift ça me semble ou paraît inutile/être le cadeau idéal;∎ he strikes me as (being) sincere il me paraît sincère;∎ it doesn't strike me as being the best course of action il ne me semble pas que ce soit la meilleure voie à suivre∎ the first thing that struck me was his pallor la première chose qui m'a frappé, c'était sa pâleur;∎ what strikes you is the silence ce qui (vous) frappe, c'est le silence;∎ how did she strike you? quelle impression vous a-t-elle faite?, quel effet vous a-t-elle fait?;∎ how did Tokyo/the film strike you? comment avez-vous trouvé Tokyo/le film?;∎ we can eat here and meet them later, how does that strike you? on peut manger ici et les retrouver plus tard, qu'en penses-tu?;∎ I wasn't very struck British with or American by his colleague son collègue ne m'a pas fait une grande impression∎ the church clock struck five l'horloge de l'église a sonné cinq heures;∎ it was striking midnight as we left minuit sonnait quand nous partîmes(g) (play → note, chord) jouer;∎ she struck a few notes on the piano elle a joué quelques notes sur le piano;∎ when he struck the opening chords the audience applauded quand il a joué ou plaqué les premiers accords le public a applaudi;∎ his presence/his words struck a gloomy note sa présence a/ses paroles ont mis une note de tristesse;∎ the report strikes an optimistic note/a note of warning for the future le rapport est très optimiste/très alarmant pour l'avenir;∎ does it strike a chord? est-ce que cela te rappelle ou dit quelque chose?;∎ to strike a chord with the audience faire vibrer la foule;∎ her description of company life will strike a chord with many managers beaucoup de cadres se reconnaîtront dans sa description de la vie en entreprise(h) (arrive at, reach → deal, treaty, agreement) conclure;∎ to strike a bargain conclure un marché;∎ I'll strike a bargain with you je te propose un marché;∎ it's not easy to strike a balance between too much and too little freedom il n'est pas facile de trouver un équilibre ou de trouver le juste milieu entre trop et pas assez de liberté∎ to strike fear or terror into sb remplir qn d'effroi(j) (cause to become) rendre;∎ to strike sb blind/dumb rendre qn aveugle/muet;∎ the news struck us speechless with horror nous sommes restés muets d'horreur en apprenant la nouvelle;∎ I was struck dumb by the sheer cheek of the man! je suis resté muet devant le culot de cet homme!;∎ a stray bullet struck him dead il a été tué par une balle perdue;∎ she was struck dead by a heart attack elle a été foudroyée par une crise cardiaque;∎ God strike me dead if I lie! je jure que c'est la vérité!∎ he struck a match or a light il a frotté une allumette;∎ British familiar old-fashioned strike a light! nom de Dieu!∎ familiar British to strike it lucky, American to strike it rich (make material gain) trouver le filon; (be lucky) avoir de la veine(m) (adopt → attitude) adopter;∎ he struck an attitude of wounded righteousness il a pris un air de dignité offensée(n) (mint → coin, medal) frapper∎ to strike camp lever le camp;∎ Nautical to strike the flag or the colours amener les couleurs;∎ Theatre to strike the set démonter le décor∎ that remark must be struck or American stricken from the record cette remarque doit être retirée du procès-verbal∎ the union is striking four of the company's plants le syndicat a déclenché des grèves dans quatre des usines de la société;∎ students are striking their classes les étudiants font la grève des cours;∎ the dockers are striking ships carrying industrial waste les dockers refusent de s'occuper des cargos chargés de déchets industriels∎ to strike roots prendre racine;∎ the tree had struck deep roots into the ground l'arbre avait des racines très profondes∎ she struck at me with her umbrella elle essaya de me frapper avec son parapluie;∎ familiar to strike lucky avoir de la veine;∎ proverb strike while the iron is hot il faut battre le fer pendant qu'il est chaud(b) (attack → gen) attaquer; (→ snake) mordre; (→ wild animal) sauter ou bondir sur sa proie; (→ bird of prey) fondre ou s'abattre sur sa proie;∎ the bombers struck at dawn les bombardiers attaquèrent à l'aube;∎ the murderer has struck again l'assassin a encore frappé;∎ these are measures which strike at the root/heart of the problem voici des mesures qui attaquent le problème à la racine/qui s'attaquent au cœur du problème;∎ this latest incident strikes right at the heart of government policy ce dernier incident remet complètement en cause la politique gouvernementale∎ they're striking for more pay ils font grève pour obtenir une augmentation de salaire;∎ the nurses struck over the minister's decision to freeze wages les infirmières ont fait grève suite à la décision du ministre de bloquer les salaires∎ midnight had already struck minuit avait déjà sonné(e) (happen suddenly → illness, disaster, earthquake) survenir, se produire, arriver;∎ we were travelling quietly along when disaster struck nous roulions tranquillement lorsque la catastrophe s'est produite;∎ the first tremors struck at 3 a.m. les premières secousses sont survenues à 3 heures du matin(f) (travel, head)∎ to strike across country prendre à travers champs;∎ they then struck west ils sont ensuite partis vers l'ouest(i) (of cutting) prendre (racine)►► strike ballot = vote avant que les syndicats ne décident d'une grève;Insurance strike clause clause f pour cas de grève;strike force (nuclear capacity) force f de frappe; (of police, soldiers → squad) détachement m ou brigade f d'intervention; (→ larger force) force f d'intervention;strike fund = caisse de prévoyance permettant d'aider les grévistes;strike pay salaire m de gréviste (versé par le syndicat ou par un fonds de solidarité);Finance strike price (for share) prix m d'exercice∎ the government struck back at its critics le gouvernement a répondu à ceux qui le critiquaientfoudroyer, terrasser;∎ figurative struck down by disease terrassé par la maladie∎ to be struck off (doctor, solicitor) être radié(c) Typography tirer∎ (go) to strike off to the left prendre à gauche;∎ we struck off into the forest nous sommes entrés ou avons pénétré dans la forêt(a) (cross out) rayer, barrer(b) (in baseball) éliminer(a) (set up on one's own) s'établir à son compte∎ she struck out across the fields elle prit à travers champs;∎ figurative they decided to strike out into a new direction ils ont décidé de prendre une nouvelle direction∎ we struck out for the shore nous avons commencé à nager en direction de la côte(d) (aim a blow) frapper;∎ she struck out at him elle essaya de le frapper; figurative elle s'en est prise à lui;∎ they struck out in all directions with their truncheons ils distribuaient des coups de matraque à droite et à gauche(e) (in baseball) être éliminéBritish (cross out) rayer, barrer∎ to strike up a conversation with sb engager la conversation avec qn;∎ they immediately struck up a conversation ils sont immédiatement entrés en conversation;∎ to strike up an acquaintance/a friendship with sb lier connaissance/se lier d'amitié avec qn∎ the band struck up the national anthem l'orchestre commença à jouer l'hymne national ou entonna les premières mesures de l'hymne national(musician, orchestra) commencer à jouer; (music) commencer -
4 функция почвы
функция почвы
—
[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
soil function
The main soil function is participation in the material transformation and migrating processes occurring in the natural environment on which the functioning of ecosystems depends. The most active participants in the occurring processes are microorganisms and invertebrates, whose activity, different variety, complex structure, and abundance accurately reflect the soil type and its characteristics: so they are important indicators of ecological stability. The variety of soil organisms determine its self-regulatory and self-cleaning capacity. (Source: NERIS)
[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]Тематики
EN
DE
FR
Русско-французский словарь нормативно-технической терминологии > функция почвы
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