|
从UL1082上截取的:
2 E5 p$ _1 w' {% e: e29 Resistance of Grounding Test+ ?& f# e6 M+ A: ]
29.1 The resistance between the point of connection of the equipment-grounding means at or within the
' _; v# M3 z0 n4 [! T, Rappliance and any other point in the grounding circuit of the appliance shall not exceed 0.1 ohms.' P- n, r- D, Z+ w+ C0 Z4 R
29.2 Compliance with the requirement in 29.1 is to be determined by:% y4 I2 u6 F# i* Z1 |/ w9 `) b0 A
a) A resistance-measuring instrument, or- f- h# i( Z: P3 D
b) Passing an alternating current of at least 25 amperes from a power supply of not more than
# @, q$ ~( k$ S& s12 volts from the grounding pin of the attachment plug cap to a point in the grounding circuit,; p* R, p- _; B/ z8 H/ Q2 D4 M+ W9 \
and then measuring the resulting drop in potential between the two points. The resistance in; L9 t0 ]& w, G7 s3 w
ohms is to be determined by dividing the drop in potential in volts by the current in amperes
: I9 w2 n& R. l% X3 B( j0 ipassing between the two points. |
|