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songbolove 发表于 2012-2-2 09:12  - H: G: |# t- T0 b
以GB7000.5 道路与街路照明灯具为例：* P0 ]; _1 I( g" ]+ p( r+ 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， ...
c) no trace of water on current-carrying parts or SELV parts where the voltage under load, p9 ?0 M* Y- B" r
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard: L- S8 g0 N/ _; N |- f: j
for the user or surroundings, for example, where it could reduce the creepage distances
1 X, q5 Q7 Q6 nbelow the values specified in Section 11;
6 _) H0 X) z! E6 G7 |4 n! Gd) 1) For luminaires without drain holes, there shall be no water entry.
+ J7 {8 d$ e2 k# k: i& SNOTE Care should be taken not to mistake condensation for water entry.: g' m& o! J/ K% U; {& M
2) For luminaires with drain holes, water entry including condensation is allowed during the
& V6 }8 Z* B' B1 h' n: Ltests if it can drain out effectively and provided it does not reduce the creepage and
+ X) e9 U/ g' H0 L) P" `) Aclearance distances below the minimum levels specified in the standard;
- i0 R& B+ ? {& z9 g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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