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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.& |& {: X$ \: n, T& T9 E$ x$ z
对比过10A,30A,35A，感觉不到电阻变化很大。% e2 l$ \/ b4 m! P( x% A
UL1082
3 M) D1 B& Y! k( W. \! _6 }29 Resistance of Grounding Test
; z* r. F& m' }; l) k: k29.1 The resistance between the point of connection of the equipment-grounding means at or within the
# u$ x/ o5 W i7 m. Eappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
" a: K! V) X9 w# ~0 n% |29.2 Compliance with the requirement in 29.1 is to be determined by:
" r7 p! B) U' N* @3 T9 Y% Ha) A resistance-measuring instrument; or& r: z6 x; b! S) c# i
b) Passing an alternating current of at least 30 amperes from a power supply of not more than
N- y9 c+ c/ ~12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,) l ^% T) D$ e" Q
and then measuring the resulting drop in potential between the two points. The resistance in
& C, Q/ l F+ T: m$ h, ]ohms is to be determined by dividing the drop in potential in volts by the current in amperes$ T4 t6 `4 ?1 |* c' g! p* d
passing between the two points. |
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发表于 2009-12-23 16:06
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