About: Ampacity     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatElectricPowerTransmissionSystems, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)
QRcode icon
http://dbpedia.demo.openlinksw.com/describe/?url=http%3A%2F%2Fdbpedia.org%2Fresource%2FAmpacity&invfp=IFP_OFF&sas=SAME_AS_OFF

Ampacity is a portmanteau for ampere capacity defined by National Electrical Codes, in some North American countries. Ampacity is defined as the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Also described as current-carrying capacity. Design of an electrical system will normally include consideration of the current-carrying capacity of all conductors of the system.

AttributesValues
rdf:type
rdfs:label
  • Nennstrom (de)
  • Ampacity (en)
  • Corriente máxima (es)
  • Courant permanent admissible (fr)
  • Prąd znamionowy (pl)
  • Märkström (sv)
  • 额定电流 (zh)
rdfs:comment
  • Der Nennstrom ist der in einem elektrischen Gerät fließende Strom, wenn das Gerät mit der Nennspannung versorgt wird und seine Nennleistung abgibt. (de)
  • La corriente máxima (también conocida como corriente admisible y, sobre todo en los países hispanoamericanos, como ampacidad, tomado del inglés ampacity) es la máxima intensidad de corriente que puede establecerse de manera constante por un conductor sin sobrepasar los límites de temperatura que afecten las características físicas y eléctricas del mismo. Esta corriente varía según las condiciones en que se encuentre el conductor, su sección, el material de su aislamiento y de la cantidad de conductores agrupados. (es)
  • Selon la Commission électrotechnique internationale, le courant (permanent) admissible est « la 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 ». (fr)
  • Prąd znamionowy – ustalony prąd pracy urządzenia elektrycznego, przy poziomie którego urządzenie to zachowuje się zgodnie z jego przeznaczeniem. Informacja o prądzie znamionowym zamieszczana jest na tabliczce znamionowej urządzenia oraz zamieszczana w instrukcji obsługi urządzenia. (pl)
  • Märkström är den största ström som en apparat eller komponent är avsedd att arbeta med under normala driftsförhållanden. På liknande sätt är märkspänning och märkeffekt för apparater och komponenter gränsvärden som normalt inte bör överskridas. (sv)
  • 额定电流是指导体可连续承载的最大电流,電流以安培为单位。导体的额定电流取决于自身在不损坏的情况下散热的能力。所有常见的导体对电流都有一定的阻力。电流流过導體時会导致电压下降和功率耗散,从而使导体发热。 (zh)
  • Ampacity is a portmanteau for ampere capacity defined by National Electrical Codes, in some North American countries. Ampacity is defined as the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Also described as current-carrying capacity. Design of an electrical system will normally include consideration of the current-carrying capacity of all conductors of the system. (en)
dcterms:subject
Wikipage page ID
Wikipage revision ID
Link from a Wikipage to another Wikipage
Link from a Wikipage to an external page
sameAs
dbp:wikiPageUsesTemplate
has abstract
  • Ampacity is a portmanteau for ampere capacity defined by National Electrical Codes, in some North American countries. Ampacity is defined as the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Also described as current-carrying capacity. The ampacity of a conductor depends on its ability to dissipate heat without damage to the conductor or its insulation. This is a function of the insulation temperature rating, the electrical resistance of the conductor material, the ambient temperature, and the ability of the insulated conductor to dissipate heat to the surrounds. All common electrical conductors have some resistance to the flow of electricity. Electric current flowing through them causes voltage drop and power dissipation, which heats conductors. Copper or aluminum can conduct a large amount of current without damage, but long before conductor damage, insulation would, typically, be damaged by the resultant heat. The ampacity for a conductor is based on physical and electrical properties of the material and construction of the conductor and of its insulation, ambient temperature, and environmental conditions adjacent to the conductor. Having a large overall surface area can dissipate heat well if the environment can absorb the heat. In electrical cables different conditions govern, and installation regulations normally specify that the most severe condition along the run will govern each cable conductor'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 cables in proximity. When multiple cables are in proximity, each contributes heat to the others and diminishes the amount of external cooling affecting the individual cable conductors. The overall ampacity of insulated cable conductors in a bundle of more than three cables must also be derated, whether in a raceway or cable. Usually the derating 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 °C, often with an ambient air temperature of 30 °C. In the United States, 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 a conductor generally needs to be decreased (derated) when conductors are in a grouping or cable, enclosed in conduit, or an enclosure restricting heat dissipation. e.g. The United States National Electrical Code, Table 310.15(B)(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 free air has 70 A rating. Ampacity rating is normally for continuous current, and short periods of overcurrent occur without harm in most cabling systems. Electrical code rules will give ratings for wiring where short-term loads are present, for example, in a hoisting motor. For systems such as underground power transmission cables, evaluation of the short-term over-load capacity of the cable system requires a detailed analysis of the cable's thermal environment and an evaluation of the commercial value of the lost service life due to excess temperature rise. Design of an electrical system will normally include consideration of the current-carrying capacity of all conductors of the system. 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. (en)
  • Der Nennstrom ist der in einem elektrischen Gerät fließende Strom, wenn das Gerät mit der Nennspannung versorgt wird und seine Nennleistung abgibt. (de)
  • La corriente máxima (también conocida como corriente admisible y, sobre todo en los países hispanoamericanos, como ampacidad, tomado del inglés ampacity) es la máxima intensidad de corriente que puede establecerse de manera constante por un conductor sin sobrepasar los límites de temperatura que afecten las características físicas y eléctricas del mismo. Esta corriente varía según las condiciones en que se encuentre el conductor, su sección, el material de su aislamiento y de la cantidad de conductores agrupados. (es)
  • Selon la Commission électrotechnique internationale, le courant (permanent) admissible est « la 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 ». (fr)
  • Prąd znamionowy – ustalony prąd pracy urządzenia elektrycznego, przy poziomie którego urządzenie to zachowuje się zgodnie z jego przeznaczeniem. Informacja o prądzie znamionowym zamieszczana jest na tabliczce znamionowej urządzenia oraz zamieszczana w instrukcji obsługi urządzenia. (pl)
  • Märkström är den största ström som en apparat eller komponent är avsedd att arbeta med under normala driftsförhållanden. På liknande sätt är märkspänning och märkeffekt för apparater och komponenter gränsvärden som normalt inte bör överskridas. (sv)
  • 额定电流是指导体可连续承载的最大电流,電流以安培为单位。导体的额定电流取决于自身在不损坏的情况下散热的能力。所有常见的导体对电流都有一定的阻力。电流流过導體時会导致电压下降和功率耗散,从而使导体发热。 (zh)
gold:hypernym
prov:wasDerivedFrom
page length (characters) of wiki page
foaf:isPrimaryTopicOf
is Link from a Wikipage to another Wikipage of
Faceted Search & Find service v1.17_git139 as of Feb 29 2024


Alternative Linked Data Documents: ODE     Content Formats:   [cxml] [csv]     RDF   [text] [turtle] [ld+json] [rdf+json] [rdf+xml]     ODATA   [atom+xml] [odata+json]     Microdata   [microdata+json] [html]    About   
This material is Open Knowledge   W3C Semantic Web Technology [RDF Data] Valid XHTML + RDFa
OpenLink Virtuoso version 08.03.3330 as of Mar 19 2024, on Linux (x86_64-generic-linux-glibc212), Single-Server Edition (378 GB total memory, 60 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2024 OpenLink Software