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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.& j) E! A9 ~! m: P0 O( H* f
对比过10A,30A,35A，感觉不到电阻变化很大。
! _% Z6 }( R) h, kUL1082
" Z' L, G2 {% N! p3 t/ K8 L29 Resistance of Grounding Test
6 @. b" {; j' T. }$ y S29.1 The resistance between the point of connection of the equipment-grounding means at or within the/ b# I$ z, R+ ~
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
% J8 f* {$ L: e29.2 Compliance with the requirement in 29.1 is to be determined by:7 K! g* X: k2 x) I4 W6 `" g2 {
a) A resistance-measuring instrument; or; I7 q: S% {9 J" d, S1 H. T/ `
b) Passing an alternating current of at least 30 amperes from a power supply of not more than/ F. U \' j7 p# S: |. _6 b
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
' c2 x5 i( ?2 F0 ^+ |! xand then measuring the resulting drop in potential between the two points. The resistance in
7 d2 C+ b8 S6 w2 Y! `- V$ Rohms is to be determined by dividing the drop in potential in volts by the current in amperes
( N2 X6 t. F9 r& P+ H* `passing between the two points. |
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发表于 2009-12-23 16:06
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