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UL1029a :
$ ~ E. D- I7 x1 b* U. P5.3.2 Component abnormal conditions
0 e8 l( v: M- o% o! F5.3.2.1 For electronic devices, various semiconductors (solid state) components and electrolytic capacitors shall be shorted one at a time to determine there would be no fire hazard.5.3.2.2 If it can be determined by circuit inspection that some diodes would not cause a hazardous condition or a short would be the same as the “lamp open” condition previously conducted, the component need not be shorted. Components located in circuits that were capable of delivering more than 50 W of power are to be short-circuited or open circuited in turn. The locus (locations) of the 50 W points can be determined with the method described in the Standard for Fluorescent-Lamp Ballasts, UL 935.% Y; B6 Y0 j6 q
5.3.2.3 The device under test was checked for fire hazards by observation, checked for ignition or
5 D t# W: ~" t+ L0 Cdripping of potting compound, and emission of flames or molten metal from the device enclosure.
" T" ]$ R2 j N+ @$ x7 u0 E! h" c6 q, J4 @# r, M4 P7 k+ S. Q3 C
我的问题是:元件的短路是在灯点亮之前还是之后? |
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