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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." W! a: b2 X6 _
对比过10A,30A,35A，感觉不到电阻变化很大。
; }% K% l3 A# I+ J9 i9 ]UL10821 b7 n- S8 w Y6 g3 O9 `' i0 `
29 Resistance of Grounding Test8 {! ?( x) t1 A, A1 c
29.1 The resistance between the point of connection of the equipment-grounding means at or within the- Y( z4 B! u. Y- `
appliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
% [8 S0 h, T. \1 ]( x: F29.2 Compliance with the requirement in 29.1 is to be determined by:3 _% @: C% V# R$ t; }
a) A resistance-measuring instrument; or
0 E' j6 j( `4 K7 @8 N2 p, Q/ ub) Passing an alternating current of at least 30 amperes from a power supply of not more than4 y5 c7 W2 X: q3 O$ K- B9 p$ L# e
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
% J% l# a: U; G! cand then measuring the resulting drop in potential between the two points. The resistance in
3 K4 F% c4 S+ g" H* e+ u2 wohms is to be determined by dividing the drop in potential in volts by the current in amperes
' v" m# P2 R& l1 }passing between the two points. |
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发表于 2009-12-23 16:06
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