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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.) k Z0 Y0 g1 ~, I1 I$ g' Q
对比过10A,30A,35A，感觉不到电阻变化很大。
6 J5 O$ m6 G4 U+ ?( P4 R5 mUL1082
. x0 Q: E# j5 o- T% m29 Resistance of Grounding Test
( q! w- B' C3 Z5 q/ H29.1 The resistance between the point of connection of the equipment-grounding means at or within the
$ o, R; }2 N0 W- { b4 X3 b nappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.8 T. ~* Y% x# U
29.2 Compliance with the requirement in 29.1 is to be determined by:
, q! D/ M, }& G& `4 d% ]a) A resistance-measuring instrument; or
1 ?1 X8 t% R |9 |, Ub) Passing an alternating current of at least 30 amperes from a power supply of not more than
- V3 ~7 G M6 Q9 D& H6 K12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,9 ^3 C1 ?' k+ J; E! D5 O
and then measuring the resulting drop in potential between the two points. The resistance in/ a9 H0 B) Q2 \" p/ P6 X& @
ohms is to be determined by dividing the drop in potential in volts by the current in amperes3 P3 D; [: p+ ?+ H4 T7 b+ I) f
passing between the two points. |
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发表于 2009-12-23 16:06
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