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/ f% c, }$ s2 }28.2Electrical connections and connections providing earthing continuity shall be1 c# z0 f F$ B7 u
constructed so that contact pressure is not transmitted through insulating material that is
9 _, n8 R; M* {6 z/ B* _) b& bliable to shrink or to distort unless there is sufficient resiliency in the metallic parts to" _+ e/ o9 ?# l6 d% {% F
compensate for any possible shrinkage or distortion of the insulating material.
* q( W7 x" x7 HNOTE Ceramic material is not liable to shrink or to distort.$ k- z$ s- z' P) u4 A) M6 a
w" b7 P0 y5 H3 T3 ?# x2 S) B/ b
0 J T3 D* M/ v. x/ S7 s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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