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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.) `9 j. C, y8 s* L
对比过10A,30A,35A，感觉不到电阻变化很大。6 U; L; D6 r) ~* ?+ y
UL1082) m5 x, L& R7 X4 C, d J
29 Resistance of Grounding Test
% B, A! I9 R' C/ G8 z, G29.1 The resistance between the point of connection of the equipment-grounding means at or within the
9 x1 i/ V% G6 h5 tappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.: P% e& O4 ~2 b
29.2 Compliance with the requirement in 29.1 is to be determined by:: q! f6 t; I$ {" z, P' {3 l
a) A resistance-measuring instrument; or, G9 j" c8 V1 f; D5 _8 D) l+ O, \
b) Passing an alternating current of at least 30 amperes from a power supply of not more than: z2 l {% r- @+ Y
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,3 m% ?2 e& B9 `: t; ]
and then measuring the resulting drop in potential between the two points. The resistance in8 E1 t2 Q/ k3 d2 K4 \3 E
ohms is to be determined by dividing the drop in potential in volts by the current in amperes1 W# S/ g {0 d. S) F7 i3 G7 L
passing between the two points. |
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发表于 2009-12-23 16:06
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