|
|
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.
' |, g. ~5 v: A$ C5 ?9 D对比过10A,30A,35A，感觉不到电阻变化很大。4 ~* A/ s' P% k$ f+ b9 n" o* ~
UL1082! S- Y) ?- \' s9 d
29 Resistance of Grounding Test
/ `% ?, G; s* [& L3 F E29.1 The resistance between the point of connection of the equipment-grounding means at or within the
& b3 X% s$ X/ R- aappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
( m' A7 |6 f$ t8 b29.2 Compliance with the requirement in 29.1 is to be determined by:
4 x8 D$ G% g2 ?8 Ra) A resistance-measuring instrument; or8 R) G5 g" ~8 ~' o( y( f$ S
b) Passing an alternating current of at least 30 amperes from a power supply of not more than3 a/ \1 A# U$ I7 p$ [
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
+ A1 F) p {. H; qand then measuring the resulting drop in potential between the two points. The resistance in
) T2 d0 T$ S; M( s1 p+ Johms is to be determined by dividing the drop in potential in volts by the current in amperes* y5 Q& S' k$ n: V; o' }1 y7 X
passing between the two points. |
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 )
窥视卡
雷达卡
发表于 2009-12-23 16:06
显身卡