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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.3 ?1 [+ K, ~& k0 @) S7 |: Y
对比过10A,30A,35A，感觉不到电阻变化很大。0 i @5 Q( f, h6 \9 W; w7 o
UL1082
' F& [% O8 M2 l( i6 n0 X/ q& R1 ?# ~29 Resistance of Grounding Test
% x6 M; _- u9 ~* U$ i! N3 p, x3 t- @29.1 The resistance between the point of connection of the equipment-grounding means at or within the
. i+ U6 Y* W4 G: p5 f8 f$ ^: Wappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
+ o( @3 n/ i' V5 j6 D ~$ C29.2 Compliance with the requirement in 29.1 is to be determined by:; H$ R% G) p! L
a) A resistance-measuring instrument; or
! C: N$ [# `8 n- f \5 Kb) Passing an alternating current of at least 30 amperes from a power supply of not more than
% M$ F# e7 x$ j12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
1 C7 A6 ]9 p4 r0 F' H: gand then measuring the resulting drop in potential between the two points. The resistance in
8 m$ g5 I. @! s; yohms is to be determined by dividing the drop in potential in volts by the current in amperes7 v9 u) N8 A2 g$ A
passing between the two points. |
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发表于 2009-12-23 16:06
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