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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.2 ^1 f- I! O) A# H7 T
对比过10A,30A,35A,感觉不到电阻变化很大。
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! K* b# {& b4 Y# f29 Resistance of Grounding Test
7 D, c9 L( r+ R1 |* k* k% a29.1 The resistance between the point of connection of the equipment-grounding means at or within the
3 D1 s. w8 `* r# M8 }appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.% G# v0 c w. o' Q& ?
29.2 Compliance with the requirement in 29.1 is to be determined by:8 B/ K' P9 g b/ h8 N
a) A resistance-measuring instrument; or
6 l. k4 w% a# E- Bb) Passing an alternating current of at least 30 amperes from a power supply of not more than
2 j, D K, E4 q! K12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,* I7 M' C8 a( D1 l/ e+ F
and then measuring the resulting drop in potential between the two points. The resistance in" Q# L9 A) f2 _8 Z
ohms is to be determined by dividing the drop in potential in volts by the current in amperes7 C5 O' E% }3 ]- e- Q
passing between the two points. |
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