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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.8 L% @) {+ y. m
对比过10A,30A,35A，感觉不到电阻变化很大。
8 k6 u" X% n& z5 aUL10821 N- N9 O5 s+ W; n, e
29 Resistance of Grounding Test
5 e3 d! `$ q5 ~7 ~/ |29.1 The resistance between the point of connection of the equipment-grounding means at or within the+ s7 D/ R5 W2 m( w9 ?) o) z
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
% T, K' l. y4 N! [0 u29.2 Compliance with the requirement in 29.1 is to be determined by:* o0 n6 V$ f: r# \" z. w
a) A resistance-measuring instrument; or) `0 a7 i5 H3 o( E. Q
b) Passing an alternating current of at least 30 amperes from a power supply of not more than
& e; e3 x) z' j3 p12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
' b6 i$ E/ x6 j/ J( g+ ?& cand then measuring the resulting drop in potential between the two points. The resistance in
2 v U# t$ H6 o: |ohms is to be determined by dividing the drop in potential in volts by the current in amperes
8 P% S7 V2 t% g6 }7 vpassing between the two points. |
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发表于 2009-12-23 16:06
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