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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.% ]/ Y* _! T; Z- L4 z, k
对比过10A,30A,35A，感觉不到电阻变化很大。/ {6 V& ~( V( G5 x
UL1082- A+ i7 j, j! Z
29 Resistance of Grounding Test3 W5 k- m- P/ z: m! b5 V
29.1 The resistance between the point of connection of the equipment-grounding means at or within the1 c1 G6 j2 a! Z2 w& r' x. }& w. {
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
* V3 I3 P T" U* l29.2 Compliance with the requirement in 29.1 is to be determined by:
! F) \3 U8 x; k3 N# B* c2 B) _a) A resistance-measuring instrument; or
# z7 b/ M- h8 b- P7 ub) Passing an alternating current of at least 30 amperes from a power supply of not more than5 _& M! z1 k. R, Z7 j
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,- J7 L6 U& ?9 G2 v5 _
and then measuring the resulting drop in potential between the two points. The resistance in
* w" ?4 w% t) z5 f8 D. [ohms is to be determined by dividing the drop in potential in volts by the current in amperes6 Y; P% t/ F) N" e
passing between the two points. |
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发表于 2009-12-23 16:06
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