|
从UL1082上截取的:! i- `, Y2 b. i5 t* V
29 Resistance of Grounding Test
$ d# X- \( }/ H' x: x# e29.1 The resistance between the point of connection of the equipment-grounding means at or within the
! w7 L% A f w7 W# W! n" Dappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.
Q! s7 ~ |* |5 l% V29.2 Compliance with the requirement in 29.1 is to be determined by:) U* |( i* j6 q
a) A resistance-measuring instrument, or) F: D- b# i$ O( B7 d
b) Passing an alternating current of at least 25 amperes from a power supply of not more than9 [0 i- t- u( b
12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,
" \; B; n, n5 w! K3 b* B" Aand then measuring the resulting drop in potential between the two points. The resistance in! x0 ` w1 K& U- ]% Q/ I7 R- c# Y
ohms is to be determined by dividing the drop in potential in volts by the current in amperes
8 g6 v3 Y/ @0 x+ B4 ipassing between the two points. |
|