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29.1 Clearances shall not be less than the values specified in Table 16, taking into1 c9 a1 ], g6 J" X; W
account the rated impulse voltage for the overvoltage categories of Table 15, unless, for
- X+ H7 P) O, hbasic insulation and functional insulation, they comply with the impulse voltage test of! F H3 j9 T# L0 y4 p( @
Clause 14. However, if the construction is such that the distances could be affected by wear,
) @) ~. F. _$ K* e2 qby distortion, by movement of the parts or during assembly, the clearances for rated impulse+ _* j. M$ A& W, p' ^; n/ o B
voltages of 1 500 V and above are increased by 0,5 mm and the impulse voltage test is not
6 f+ R6 F2 u/ e1 X9 a/ g& h* bapplicable.3 z- y1 N+ h# W3 @
The impulse voltage test is not applicable when the microenvironment is pollution degree 3 or* z, }/ B3 t I6 s K- X6 i
for basic insulation of class 0 appliances and class 0I appliances.", r1 Y/ i( i |2 G. U& Z8 p( f {
2 P3 Z0 g* O2 Z) P14章对功能绝缘和基本绝缘适用,电气间隙过不了,一般认证机构不会去做14章的。直接就failed了" B* M7 c1 |0 a
( g( j: I$ F$ \. {+ Z
污染等级, 一般暴露在外面, 有电机。 的部位一般判3类
* U0 F0 n0 k! e c T" |有一定的密封, 一般不会有灰尘进去就可以判2类。" A8 T: t. s& y( Z3 _# m& T
1类一般很少判, 除非象继电器一样完全密封的才看作1类。 |
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