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22.35
, ~* z' T2 I2 w For constructions other than those of class III, handles, levers and knobs that are held or
S; B0 K4 o: R! p+ D; j6 T5 ?( o# Bactuated in normal use shall not become live in the event of a failure of basic insulation.9 ~: g$ K& Y% I Z( T* c/ o9 M
If these handles, levers and knobs are of metal and if their shafts or fixings are likely to }- x( X0 Z1 H, p4 v. C
become live in the event of a failure of basic insulation, they shall be adequately covered by
4 Z& f! W# e$ S3 Oinsulating material or their accessible parts shall be separated from their shafts or fixings by7 H4 Y* Q2 Q, x0 _, g9 x
supplementary insulation.9 u D8 ^+ a& G: _5 X
关于基本绝缘失效的情况,有些疑惑.
% }. Q9 ]8 G+ f; Y 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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