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A.1 In order to determine whether a conductive part is a live part which may cause an electric. }3 |4 U" W. e( n+ m) e- f; w
shock, the lamp controlgear is operated at rated voltage and nominal supply frequency, and
: c- H- h3 H9 f: S1 t9 x& n3 Q' bthe following tests are conducted.3 b3 |. H/ \/ C
A.2 The part concerned is a live part if a current of more than 0,7 mA (peak) or 2 mA d.c. is1 k$ I! w# c% Y$ H+ X! f
measured.
! @8 F6 ~! S% t5 ?For frequencies above 1 kHz, the limit of 0,7 mA (peak) is multiplied by the value of the4 k' I6 U6 g/ j6 R3 H" U- T# x
frequency in kilohertz, but the result shall not exceed 70 mA (peak).# |5 k3 p9 L" E7 ~
The current flowing between the part concerned and earth is measured.
& q* M# K' Q3 XCompliance is checked by measurement in accordance with Figure 4 and 7.1 of IEC 60990.7 k, Z" N/ p9 F4 g4 q! z8 ]$ i
A.3 The voltage between the part concerned and any accessible part is measured, the
! J4 L. p9 n- Pmeasuring circuit having a non-inductive resistance of 50 kΩ. The part concerned is a live
9 C( y) S; ?6 H' ?! Jpart if a voltage of more than 34 V (peak) is measured.) z3 y6 K0 a0 P: M% Y
For 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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