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songbolove 发表于 2012-2-2 09:12 
2 O0 x6 {$ d- L' V; u以GB7000.5 道路与街路照明灯具为例：
( \9 e# R6 F& z0 T' x. g% ]: v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， ...
: F/ @( H( ]1 C( Q6 Hc) no trace of water on current-carrying parts or SELV parts where the voltage under load
5 z6 ~" R5 o, l/ M6 m: N) a3 ~4 Mexceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard/ `- G3 x& b7 h9 p
for the user or surroundings, for example, where it could reduce the creepage distances/ |. H2 H) t9 h3 i3 @' X
below the values specified in Section 11;9 f# r/ }4 \5 O, k x' ~1 c
d) 1) For luminaires without drain holes, there shall be no water entry.
7 q4 o5 t: F' f# _1 NNOTE Care should be taken not to mistake condensation for water entry.- |5 g0 q! R2 L5 ^! g
2) For luminaires with drain holes, water entry including condensation is allowed during the
% Q8 L- [8 u- R9 S. ]- z0 ctests if it can drain out effectively and provided it does not reduce the creepage and
+ e/ I$ y, ~/ w& d) H( {1 e$ ?clearance distances below the minimum levels specified in the standard;
, M. ~2 K1 c( p0 Y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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