|
3.4.4' a7 A8 O" t, @- Z# H6 s# m
protective extra-low voltage circuit
9 y: P. L# l& k4 yearthed circuit operating at safety extra-low voltage which is separated from other circuits
; C, F# {* c3 s$ j5 `8 U6 z4 l6 p8 Eby basic insulation and protective screening, double insulation or reinforced insulation
! g! f& M& m2 T+ |8 Y. G+ C0 }/ r; I% ~* W
NOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.) g& P% j9 [( G$ q$ P, b$ d# T; l) d4 Z
NOTE 2 A protective extra-low voltage circuit is also known as a PELV circuit.. u; ], E7 ] A: r) |
( b( u' {- z2 d6 A# o8 i: Y
PELV电路与其它电路用基本绝缘和保护性屏障, 或双重/加强绝缘隔离开, 其中屏障应接地,以弥补基本绝缘的不足. |
|