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songbolove 发表于 2012-2-2 09:12 
0 q$ U0 U& C$ Z8 ^( U以GB7000.5 道路与街路照明灯具为例:
- T$ E w$ \: V" C3 ?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, ...
; E, t4 D) [" j) D& M. j! v! ic) no trace of water on current-carrying parts or SELV parts where the voltage under load
$ v; Q/ z5 Q+ gexceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
0 a1 M) `1 j, T p& p! Cfor the user or surroundings, for example, where it could reduce the creepage distances' ?& ?' I0 E l+ F$ g
below the values specified in Section 11;8 {5 I. \5 G# J0 ?8 B3 \$ W4 ^
d) 1) For luminaires without drain holes, there shall be no water entry.! @" C: Q2 ~& u% K5 m
NOTE Care should be taken not to mistake condensation for water entry." R5 Z5 l% A: {* ~1 B
2) For luminaires with drain holes, water entry including condensation is allowed during the
' e) G& {! ?* W Y" y: Htests if it can drain out effectively and provided it does not reduce the creepage and
+ P" _3 p( M! j0 Y7 xclearance distances below the minimum levels specified in the standard;8 j, W3 x0 C. V7 E( u D; _
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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