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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.
a/ x; [) T4 I$ C, R2 s( m对比过10A,30A,35A，感觉不到电阻变化很大。
' H9 I# b0 v/ ]% P xUL1082: d2 Z8 z2 S# q9 E3 _
29 Resistance of Grounding Test
' u: K/ F( T, n! F' v/ l29.1 The resistance between the point of connection of the equipment-grounding means at or within the
. D5 a; M7 F% Y" xappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
! r- H# l9 o% L! c3 `9 H29.2 Compliance with the requirement in 29.1 is to be determined by:( d. J8 t# d4 ]* b: _
a) A resistance-measuring instrument; or
9 G9 U c3 W, ]6 d4 @2 }8 ib) Passing an alternating current of at least 30 amperes from a power supply of not more than
7 x5 _$ _3 ~+ X6 y/ [4 U12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,; ^+ I7 q6 t, z2 S% o
and then measuring the resulting drop in potential between the two points. The resistance in$ U' ~" i, q: g: j% V" h
ohms is to be determined by dividing the drop in potential in volts by the current in amperes
$ [8 V, u& ~# q$ Tpassing between the two points. |
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发表于 2009-12-23 16:06
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