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3.4.4
) H# n8 w' }3 y& Z3 hprotective extra-low voltage circuit
. @+ c; T) P3 N6 e. c/ J$ Tearthed circuit operating at safety extra-low voltage which is separated from other circuits% [6 z2 f! {5 H" e3 u. T1 ^
by basic insulation and protective screening, double insulation or reinforced insulation% A8 s" n6 M! r* l I" |8 ~: r
' H+ T* t$ ]# wNOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.# i9 g* g! _) ]
NOTE 2 A protective extra-low voltage circuit is also known as a PELV circuit.
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" F3 u0 o( r# ] E- ~1 i9 {! H/ BPELV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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