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songbolove 发表于 2012-2-2 09:12 
( G7 a- Z5 p! S! e以GB7000.5 道路与街路照明灯具为例：/ D8 M: z" r" t, [3 A% X
第12.2 “对于IP数字大于IP20的灯具，应在GB7000.1第9章的9.2之后， ...
0 U7 e# Y6 X cc) no trace of water on current-carrying parts or SELV parts where the voltage under load1 k; u. m# v$ `
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard' ?* ^) r, d5 r: z( T( h
for the user or surroundings, for example, where it could reduce the creepage distances
' s2 W; w% w* Lbelow the values specified in Section 11;
5 F9 _* F/ ^$ z; J* ]5 f. Pd) 1) For luminaires without drain holes, there shall be no water entry.
& O8 P5 ]; L2 O" \6 g8 }* [NOTE Care should be taken not to mistake condensation for water entry.& F W1 N- K( B$ N) M
2) For luminaires with drain holes, water entry including condensation is allowed during the; A% K" J" }0 B( M1 g( J5 z
tests if it can drain out effectively and provided it does not reduce the creepage and5 C) j8 Q/ x g3 m: P& \
clearance distances below the minimum levels specified in the standard;
% f$ w9 Y, \3 ^$ L0 u; I" P还需考虑电压在12 V r.m.s. or 30 V ripple-free d.c. 的SELV parts |
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发表于 2012-4-29 13:36
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