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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.% x* @. n' C1 C' I( d0 O( } A
对比过10A,30A,35A，感觉不到电阻变化很大。
) z n6 M! f5 D! U1 }$ z/ SUL10827 K2 U6 y. C" p2 [( R! V
29 Resistance of Grounding Test
( a, ?: ^/ ^/ O- ?* A29.1 The resistance between the point of connection of the equipment-grounding means at or within the4 @9 e! p4 H! q% a
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
3 s# o; r# h6 x- B. o) l$ I29.2 Compliance with the requirement in 29.1 is to be determined by:
' s3 I% r' j Q8 t4 d2 aa) A resistance-measuring instrument; or
$ W2 p; J& J( F9 ub) Passing an alternating current of at least 30 amperes from a power supply of not more than
" m2 I6 y6 [' ^% ~6 h3 M12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
* S, Y3 R5 m2 @and then measuring the resulting drop in potential between the two points. The resistance in) @$ Z' H" K+ Z' [
ohms is to be determined by dividing the drop in potential in volts by the current in amperes7 E8 Z) G. l1 c7 R: s* U
passing between the two points. |
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发表于 2009-12-23 16:06
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