|
|
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.
% D4 n$ H9 @) Y' n$ C, Y对比过10A,30A,35A，感觉不到电阻变化很大。4 O7 n; c* g* L# c2 I. [/ ^
UL1082
( X. Q" i' Z: _3 W! G29 Resistance of Grounding Test$ ^3 U6 b2 r% ~
29.1 The resistance between the point of connection of the equipment-grounding means at or within the( H- H* ?( f0 D9 q6 q7 ^1 z4 h
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.5 n0 _! O- h$ A, `
29.2 Compliance with the requirement in 29.1 is to be determined by:
. e; L8 W' W t; u: t8 I7 Ca) A resistance-measuring instrument; or
+ X- ]* Y \- s3 J4 }3 nb) Passing an alternating current of at least 30 amperes from a power supply of not more than/ ?/ ~3 z ` ~) W; t: [& M2 m
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit, g- H& @1 }$ J9 W: `% n/ V
and then measuring the resulting drop in potential between the two points. The resistance in$ R6 y& k1 U+ Q
ohms is to be determined by dividing the drop in potential in volts by the current in amperes" _% s, o6 N& h
passing between the two points. |
|
|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