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29.1 Clearances shall not be less than the values specified in Table 16, taking into0 S1 c V1 q' h" D/ J; G
account the rated impulse voltage for the overvoltage categories of Table 15, unless, for
/ O( S& Z: `7 ]9 \2 l% Ibasic insulation and functional insulation, they comply with the impulse voltage test of; f- A( p4 s9 ]) `4 b; n* K+ m# N
Clause 14. However, if the construction is such that the distances could be affected by wear,
+ J0 k0 N7 A L1 Aby distortion, by movement of the parts or during assembly, the clearances for rated impulse1 o+ V N+ Q9 v, W# d; O
voltages of 1 500 V and above are increased by 0,5 mm and the impulse voltage test is not4 ?1 z, v( r7 i" b4 { t1 t4 R
applicable.
& _0 w) N) X8 T( V2 r X$ ]The impulse voltage test is not applicable when the microenvironment is pollution degree 3 or6 a) C6 F3 a/ X6 ~+ s3 ?1 K
for basic insulation of class 0 appliances and class 0I appliances."
/ Y5 A6 g# T5 z, v d, n3 B4 ?3 w
$ { C; \4 [% H/ F/ X14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/ w4 E7 Y2 d; y* N* S: l% P" V
1 k4 I8 _* s: X2 `+ u
污染等级, 一般暴露在外面, 有电机。 的部位一般判3类
. c+ v( V$ g' M: z有一定的密封, 一般不会有灰尘进去就可以判2类。4 r2 D; M, O/ E6 Z1 P( h2 Q
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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