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3.4.4
* E4 t% c' M6 U# J, l; p' Y# mprotective extra-low voltage circuit
7 i6 N3 N: j- `. S3 e6 t }earthed circuit operating at safety extra-low voltage which is separated from other circuits
: X0 j" J% a+ c% X) kby basic insulation and protective screening, double insulation or reinforced insulation
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NOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.
3 j& R/ ^; a0 u o! D. _NOTE 2 A protective extra-low voltage circuit is also known as a PELV circuit.
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5 ^1 y- M( m% G% P" r/ P3 iPELV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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