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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.
8 h. v$ r7 ~" N) e3 G7 j对比过10A,30A,35A，感觉不到电阻变化很大。2 @& W( h* ^1 P, v
UL1082
2 U/ l2 ]0 L0 `. f8 w2 B5 n29 Resistance of Grounding Test& f0 `& o9 e" g# S. n
29.1 The resistance between the point of connection of the equipment-grounding means at or within the
0 B) ?4 W6 r4 W& B2 ?$ W( ?appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
2 M+ j c7 n! H29.2 Compliance with the requirement in 29.1 is to be determined by:; h* u* d' E6 e
a) A resistance-measuring instrument; or
9 @9 }) f" u. [0 h$ A! H; U3 X5 O9 vb) Passing an alternating current of at least 30 amperes from a power supply of not more than3 v: B( |) w) U' o6 \* ~
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,. b4 O+ }1 O& J; d2 Y
and then measuring the resulting drop in potential between the two points. The resistance in; r9 R! W% o- a: e: {; K( S6 M
ohms is to be determined by dividing the drop in potential in volts by the current in amperes
( r; `3 l- @# Fpassing between the two points. |
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发表于 2009-11-23 10:22
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