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各位高手,请教Abnormal heating test 问题

各位高手,请问60335-1中的19章的subclause 19.5非正常测试的目的何在?
19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances
incorporating tubular sheathed or embedded heating elements. However, controls are not
short-circuited but one end of the element is connected to the sheath of the heating element.
This test is repeated with the polarity of the supply to the appliance reversed and with the
other end of the element connected to the sheath.
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lane2
LV.1
2
2006-02-19 18:04
这个试验是考虑到tubular sheathed or embedded heating elements(管状外壳发热元件)中的带电发热丝和金属外壳之间的绝缘层失效时非正常情况.
PS:因为通常绝缘层是石英填充的,由于工艺上的原因,很容易造成绝缘的失效.
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alvis.tan
LV.3
3
2006-02-19 18:24
@lane2
这个试验是考虑到tubularsheathedorembeddedheatingelements(管状外壳发热元件)中的带电发热丝和金属外壳之间的绝缘层失效时非正常情况.PS:因为通常绝缘层是石英填充的,由于工艺上的原因,很容易造成绝缘的失效.
thanks
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