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songbolove 发表于 2012-2-2 09:12 
( s' b: ~0 K" b以GB7000.5 道路与街路照明灯具为例:
2 z: l/ e1 ~+ o5 P5 V$ o- l7 S* Z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, ... ( q( O5 v+ l9 q: I
c) no trace of water on current-carrying parts or SELV parts where the voltage under load, S4 H. v/ q. O8 W9 X+ v
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
, Z7 ?- s$ L8 Q/ s4 g7 Kfor the user or surroundings, for example, where it could reduce the creepage distances* Q- j/ o7 G* K9 c6 m- j7 }
below the values specified in Section 11; [1 ?0 O) q; Y% V' ?
d) 1) For luminaires without drain holes, there shall be no water entry.
( |* A \/ b8 K) @8 A( c+ t TNOTE Care should be taken not to mistake condensation for water entry.$ r' K& N$ R7 U/ I+ w
2) For luminaires with drain holes, water entry including condensation is allowed during the# [ f- v/ {! m- N: y, P9 i
tests if it can drain out effectively and provided it does not reduce the creepage and* f6 P& m% ?5 Q' A% Y- y
clearance distances below the minimum levels specified in the standard;) E! I7 H$ y% ^0 u6 Q5 j
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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