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22.35 0 _* H/ G' q0 U9 t3 z e2 g7 X
For constructions other than those of class III, handles, levers and knobs that are held or
- B+ R- |" ~% I- P# H: Sactuated in normal use shall not become live in the event of a failure of basic insulation.
) Z" E# @# x2 R! c9 QIf these handles, levers and knobs are of metal and if their shafts or fixings are likely to4 b d. w& A) v/ B: M7 w8 h
become live in the event of a failure of basic insulation, they shall be adequately covered by
$ x5 D1 Y @3 ]) v9 D' Minsulating material or their accessible parts shall be separated from their shafts or fixings by
1 p6 \, e* x0 n y. ]$ C1 E1 rsupplementary insulation. E$ T& [1 f/ j3 b+ K& v) e+ e
关于基本绝缘失效的情况,有些疑惑.+ q' M' p9 D+ P% ~$ s
举个例子来说,比如一个取暖器,控制面板有一个温控器(thermostat]) 旋钮,这个旋钮的shaft 是金属的,knob 是塑料的.假如这个旋钮很容易被施以轴向力,故能根据22.11被50N 的力拉开,那么这个产品肯定不符合安规了,因为这个温控器的金属轴是延伸至器具内部的,而基本绝缘的失效可能是某个内部导线破损而与金属轴接触,Knob如果可以被50N力拉开则不符合安规了. 但是如果不能拉开,则符合,因为就算内部基本绝缘失效,温控外部的塑料knob也能提供附加绝缘的要求. 不知道大家对于这条标准有什么看法? |
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