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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.
. ?0 d% r: Q$ p9 R/ H2 E对比过10A,30A,35A，感觉不到电阻变化很大。) i' J5 f6 g! t! F* P( A" o" P
UL1082# P% r3 b% I; \; z. q# |7 ~
29 Resistance of Grounding Test
" H' f! g% ?/ t: \3 N29.1 The resistance between the point of connection of the equipment-grounding means at or within the' v4 j5 }# N- G' R# Z0 ]& m" F N& i7 t
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
/ z k/ b- H8 R' V. H% j29.2 Compliance with the requirement in 29.1 is to be determined by:
8 ^' o# A6 \& ~/ q7 ma) A resistance-measuring instrument; or
0 a# O8 y8 O, J: P7 E% }% j, b( lb) Passing an alternating current of at least 30 amperes from a power supply of not more than
}+ H; @' W2 s. X& R( U& {3 ?12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
( }0 H" m: ^- gand then measuring the resulting drop in potential between the two points. The resistance in( s9 h* p& r+ `
ohms is to be determined by dividing the drop in potential in volts by the current in amperes
5 m! B% x9 b! Q& D0 E$ {: npassing between the two points. |
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发表于 2009-12-23 16:06
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