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28.2Electrical connections and connections providing earthing continuity shall be
! j, K& {% O" ^3 ~7 aconstructed so that contact pressure is not transmitted through insulating material that is
* N6 v6 t$ k; W; y+ S. Q' R; d" Vliable to shrink or to distort unless there is sufficient resiliency in the metallic parts to
( k7 d% w) {+ x* d! P3 R+ |compensate for any possible shrinkage or distortion of the insulating material.
- T0 l6 s% y& R3 U' F# RNOTE Ceramic material is not liable to shrink or to distort.
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! H4 s7 U7 l3 h7 E+ x- r6 U2 e用塑料来达到这个要求恐怕很难,标准里说陶瓷可以满足要求。 |
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