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3.4.4
& ^4 r( J- |2 Dprotective extra-low voltage circuit
9 C( g" Z( T& U3 qearthed circuit operating at safety extra-low voltage which is separated from other circuits
! f* L2 h, p C2 R2 A; Mby basic insulation and protective screening, double insulation or reinforced insulation/ {. F* U' G/ v w9 Y; C
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NOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.
7 ?: i9 y" B: s$ a5 c( O4 KNOTE 2 A protective extra-low voltage circuit is also known as a PELV circuit.
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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. |
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