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A.1 In order to determine whether a conductive part is a live part which may cause an electric' t( g7 f W. B7 `9 S: c
shock, the lamp controlgear is operated at rated voltage and nominal supply frequency, and
5 f" O- |8 M+ |. h! `the following tests are conducted.
# e" z8 s' A) x( B! f3 cA.2 The part concerned is a live part if a current of more than 0,7 mA (peak) or 2 mA d.c. is- w+ `& R/ x" L, }1 L7 L3 N1 L0 [
measured.: d, X) C) r9 T5 M2 X; t; Y3 p
For frequencies above 1 kHz, the limit of 0,7 mA (peak) is multiplied by the value of the+ X- V, C- o2 B- E0 r H
frequency in kilohertz, but the result shall not exceed 70 mA (peak).
3 @5 {/ z4 B! t% M6 zThe current flowing between the part concerned and earth is measured.
/ s! K, e6 d* u7 W. xCompliance is checked by measurement in accordance with Figure 4 and 7.1 of IEC 60990.) V/ S" h; {; m+ F1 u
A.3 The voltage between the part concerned and any accessible part is measured, the" S. J8 D3 \* X
measuring circuit having a non-inductive resistance of 50 kΩ. The part concerned is a live
1 g" f! m- |( g; L2 \+ k$ c; |part if a voltage of more than 34 V (peak) is measured.
: d4 y# w, E) d4 E9 z( p) U2 xFor the above test, one pole of the test supply shall be at earth potential. |
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发表于 2010-4-16 17:44
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