安规问题集锦：
1、标志不当：
a.fuse marking
b.power swITch symbol
c.protective earth symbol
d.PE wire color
2.安全说明：
a.Motltipower supply system
b.protective earth connection instruction
c.High touch current warning label
d.Hazardous voltage
3.绝缘距离：
a.10N force requirement for all parts
b.misunderstand bulk capacitor's insulation specifications
c.Ill assembly
d.misunderstand fan wire's insulation feature
e.transformer construction fail: margin tape width and turns of insulation tape
4.资料和元器件：
a.certificate out of validity
b.misuse component certificate: UL and European standards different
c.miss safety critical components in CDF: discharge resistors and bulk capacitor
d.misunderstand the requirements for safety critical components: not all safety critical components need certificate
e.misunderstand components
5.安规测试:
a.Hi-pot fail, especially after 48hours' humidity treatment
b.Touch current fail
c.Output overload fail: temp. exceeded safety limit
d.Component fault simulation: temp.on transformer and output voltage exceeded safety limit
6.设计更改和生产一致性:
a. Non-conformance between certification and production
b. Label format
7.PCB Layout图提供不对，只提供了器件装配图，没有走线图。
文章出自: 世科网
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