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Safety ELV (SELV) circuit7 s* u0 ^/ L" ~. M
electrical circuit with the following characteristics:, B6 @ ~0 b$ f, N6 B, u& C
• the voltage does not exceed ELV;
9 ^, n- m2 i! ]: J) c- E• protective separation from circuits other than SELV or PELV;
; b4 f6 b; ]0 w/ _: e• no provisions for earthing of the SELV circuit, or its accessible conductive parts;, m8 t) ]; U7 P; {& e8 j! g
• basic insulation of the SELV circuit from earth and from PELV circuits) e8 q( W9 {) I8 Q
protective ELV (PELV) circuit6 i9 z: X; v% ~, T; d# ?8 r& G
electrical circuit with the following characteristics:& o* b) _4 J% e. d( H) H. a
• the voltage does not continuously exceed ELV under single fault as well as normal
5 h1 H X9 l% l* Z4 W6 N4 Mconditions;* i; i* N& a" U: f' B; W
• protective separation from circuits other than PELV or SELV;7 l5 [( ~0 Q% z; `3 |, k
• provisions for earthing of the PELV circuit, or its accessible conductive parts, or both4 c, ^* B) g1 |! `% y
请问PELV与SELV有和区别?SLEV的第三句话(no provisions for earthing of the SELV circuit, or its accessible conductive parts;)是什么意思?
: c) n' ?4 Q( i6 W/ A! ePELV和SELV哪个是安全可接触的?另外SELV和PELV与DVCA电压的关系?
( q$ k2 {: p5 ]! [! X" N6 b: TDVCA电压等级是可以直接接触的,那如果是DVCA的电压为SELV的电路为什么要跟地做基本绝缘? |
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