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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$ c: V5 U4 W$ _
对比过10A,30A,35A，感觉不到电阻变化很大。9 E$ \7 N) \! k& R" I
UL1082. o; ^4 w9 I: |, H: O9 } C; }
29 Resistance of Grounding Test
6 C- \0 R$ {6 Z, m29.1 The resistance between the point of connection of the equipment-grounding means at or within the
. t1 z* |$ Y/ v x( A* C( ?appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
0 q0 M( H y; u2 }! g( Z29.2 Compliance with the requirement in 29.1 is to be determined by:( i+ h7 T) }* O$ N. E$ u
a) A resistance-measuring instrument; or# j, U2 q, u( K9 f
b) Passing an alternating current of at least 30 amperes from a power supply of not more than
( ]% P/ C5 ?, C. q12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,0 F4 E$ N2 o% u& h7 C: G
and then measuring the resulting drop in potential between the two points. The resistance in
2 U4 H4 u5 Q+ t+ u5 i: H% iohms is to be determined by dividing the drop in potential in volts by the current in amperes
% @0 a2 Z% v2 \) N/ C% b' Bpassing between the two points. |
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发表于 2009-12-23 16:06
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