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25.20 The insulated conductors of the supply cord for type Y attachment and type Z" V, {) m4 w6 r& g S
attachment shall be additionally insulated from accessible metal parts by basic insulation9 L1 K, ?- y9 c
for class 0 appliances, class 0I appliances and class I appliances, and by supplementary/ M( K9 V; T4 v3 c' U7 l
insulation for class II appliances. This insulation may be provided by the sheath of the x" H7 q# `! w: q+ r6 E2 ]' a. F( g2 {- J
supply cord or by other means.
) h! O3 o5 _2 \" k3 m( _! ]5 pCompliance is checked by inspection and by the relevant tests.$ v5 I4 X+ U* u, J% k1 m5 q
各位师兄,我对这点一直很疑惑,大家能发表下自己的理解吗?我的理解是如下:! X6 V& P. Y% S5 |
随便举个例子(烤箱),电源线进去不是有一段剥掉外表皮的一截线吗?那个就应该是insulated conductors of the supply cord,不知道我理解的对吗?如果是这样的话,那剥掉外皮的那段就不能碰到接地金属外壳了(class I), 而需要再加一层基本绝缘才能符合上面所说?请问大家我理解的对吗?1 @( ~% f. \3 ~* z- S3 }
如果是这样的话,我又有个疑惑:既然剥掉外皮的电源线不能接触接地的外壳,那我们一般所指的internal wire怎么就可以直接接触带接地的外壳呢?% `4 j, ?; j! S/ M/ ]
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