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3.4.4
) t% w4 C6 [- S4 L# N8 Eprotective extra-low voltage circuit
; l7 Q/ Q6 h& ~1 _earthed circuit operating at safety extra-low voltage which is separated from other circuits* B3 W, A. ^% r
by basic insulation and protective screening, double insulation or reinforced insulation6 ?2 s; C u' i' a0 x$ W2 I
- K/ |+ }3 Q3 l0 c5 r
NOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.' @) v. W5 g. k4 q
NOTE 2 A protective extra-low voltage circuit is also known as a PELV circuit.8 e# m6 M0 @3 ?6 N* {( P
) Y3 w/ d* K2 H+ l7 F6 W k- cPELV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. |
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