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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.
% y0 w, c& I6 _ _9 X* T8 d) U% |对比过10A,30A,35A,感觉不到电阻变化很大。
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29 Resistance of Grounding Test/ O% Q" |: |' Q+ G$ {+ d* ]
29.1 The resistance between the point of connection of the equipment-grounding means at or within the. t# U" ?- S. I2 B4 A+ M
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
! U1 P, B- M6 V0 e8 _$ b29.2 Compliance with the requirement in 29.1 is to be determined by:
3 q# X' ]) _" M9 `& n ]# ]. y4 Na) A resistance-measuring instrument; or
. i" H% s: M( hb) Passing an alternating current of at least 30 amperes from a power supply of not more than
8 h% J2 x0 B' E9 v12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
& C$ }- {2 f, \1 | E' Xand then measuring the resulting drop in potential between the two points. The resistance in- L7 V! F; g, d( C- ]# L9 |6 t
ohms is to be determined by dividing the drop in potential in volts by the current in amperes4 q6 _: S6 Y3 S$ J
passing between the two points. |
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