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c) The luminaire shall be tested in the enclosure for a total duration of 168 h consisting of
5 a3 o! b; ]4 R/ o8 B8 W) T* M/ wseven successive cycles of 24 h. Supply voltage as specified in item d) below shall be: Z9 n/ r$ K' ?
applied to the luminaire for the first 21 h and disconnected for the remaining 3 h of each
3 |9 P" T1 @; y7 Ycycle. The initial heating period of the luminaire is part of the first test cycle.
& D! ?" g4 Z3 E: E* Q( S3 [The circuit condition shall be as in normal operation for the first six cycles, and as in
9 {4 x* V. B' E2 d1 t7 Cabnormal operation (see Annex C) for the seventh cycle. For luminaires containing an. x" ?+ y& w0 Z
electrical motor (e.g. a fan) the abnormal condition which most adversely affects the result
o8 F. {' d2 J8 r% U8 [. Oof the test shall be selected.8 e4 V, j# U, d7 f
For luminaires for which there is no abnormal condition test according to 12.5.1, the total: z6 ^: V* s1 y; @6 d+ `
test duration shall be 240 h (i.e. 10 x 24 cycles at normal operation). For filament8 l; K% y! O& V* p$ s
luminaires, the total test duration of 240 h shall apply in all cases.
' w" j0 `/ O" \( I9 {$ X. h标准的语句我拷下来了。最后一段的意思实在是没法理解,特别是最后一句,用灯丝灯泡的灯具要怎么做耐久?还请高手解惑。谢谢! |
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