V2EX ampacity

Ampacity

Definition / 定义

载流量;允许电流(安培容量):指导线或电缆在规定条件下(如环境温度、敷设方式、绝缘等级等)能够连续安全承载而不过热的最大电流值。常用于电气设计与规范选线。

Examples / 例句

The electrician checked the ampacity before choosing the wire.
电工在选电线之前先核对了载流量。

Because the cables were bundled in a hot conduit, their ampacity had to be derated to prevent overheating and insulation damage.
由于电缆在高温管道内成束敷设,必须对载流量进行降额,以防过热并损伤绝缘层。

Pronunciation / 发音

/mpsti/

Etymology / 词源

ampacityampere(安培) + capacity(容量) 的合成词,意为“以安培计的容量/承载能力”。该词主要在 20 世纪的电气工程与电工规范语境中普及,用来更精确地指代导体“可承载电流的能力”。

Related Words / 相关词

Literary Works / 文学与典籍中的用例

  • *NFPA 70: National Electrical Code (NEC)*(《美国国家电气规范》)在导体选型与“ampacity/载流量”表格、降额条款中高频出现。
  • IEEE Std 835: IEEE Standard Power Cable Ampacity Tables(IEEE 电力电缆载流量表标准)专门围绕电缆 ampacity 的计算与表格。
  • Ugly’s Electrical References(《丑陋的电工参考手册》)以工程速查形式讲解 ampacity、线规与降额。
  • Electrical Wiring Residential(住宅电气布线教材类著作,多版本)在住宅回路设计与导线规格章节中使用 ampacity。
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