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接地阻抗测试Resistance of Grounding Test电流已经更改从25A到30A，是第六版次，其它都没变，电压设置为12V，电阻不能超过0.1ohm.
; E1 f/ I4 s0 p1 f# j# S对比过10A,30A,35A，感觉不到电阻变化很大。
u# e+ U% N/ F n2 hUL1082
8 J+ G- _0 `. u+ K$ W9 M29 Resistance of Grounding Test. m- T& J" |$ V/ Z# @% H- P
29.1 The resistance between the point of connection of the equipment-grounding means at or within the
7 I K! t3 k/ H m c( Qappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.% z6 G+ K7 x5 R
29.2 Compliance with the requirement in 29.1 is to be determined by:8 k) x# W3 \1 w) Q( @, m, [
a) A resistance-measuring instrument; or0 O- j! F1 [: z0 P8 K' g. h5 r
b) Passing an alternating current of at least 30 amperes from a power supply of not more than/ c0 R* m1 V; g, i# d& j( [% ?0 h
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,3 ]6 A: R& {2 F
and then measuring the resulting drop in potential between the two points. The resistance in4 L8 q; N' ?3 z, ~
ohms is to be determined by dividing the drop in potential in volts by the current in amperes, s% C: I) `' G! x& k
passing between the two points. |
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发表于 2009-12-23 16:06
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