SELV和PELV,FELV的区别
2012-06-05 21:45:19| 分类： 电气|字号 订阅
什么是SELV?
Safety ELV (SELV) circuit
electrical circuit with the following characteristics:
? the voltage does not exceed ELV;
? protective paration from circuits other than SELV or PELV;
? no provisions for earthing of the SELV circuit, or its accessible conductive parts;
? basic insulation of the SELV circuit from earth and from PELV circuits
安全特低电压 SELV(Safety Extra Low Voltage, 缩写 SELV) 。只作为不接地系统的安全特低电压。
什么是PELV?
protective ELV (PELV) circuit
electrical circuit with the following characteristics:
?
the voltage does not continuously exceed ELV under single fault as well as normal
conditions;
? protective paration from circuits other than PELV or SELV;
? provisions for earthing of the PELV circuit, or its accessible conductive parts, or both
保护特低电压PELV (Protective Extra Low Voltage, 缩 写 PELV) 。只作为保护接地系统的安全特低电压用防护。
什么是FELV?
功能特低电压 FELV (Functional Extra Low Voltage, 缩写 FELV) 。由于功能上的原因(非电击防护目的)，采用于特低电压，但不能满足或没有必要满足SELV和PELV的所有条件。FELV防护是在这种前提下，补充规定了某些直接接触电击和间接接触电击防护措施的一种防护。
