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songbolove 发表于 2012-2-2 09:12  4 E1 |& n& i# w" y" q' g- d
以GB7000.5 道路与街路照明灯具为例：+ S8 P3 x" J: z2 a* S
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， ...
6 b6 v( C# z, S* ?+ ]' _. Mc) no trace of water on current-carrying parts or SELV parts where the voltage under load
3 i: P0 |, K+ x0 N% Bexceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard% W( V( l$ o$ _( K s/ t2 M
for the user or surroundings, for example, where it could reduce the creepage distances
0 D% }' E6 A- O0 u. R# F3 ~8 Sbelow the values specified in Section 11;5 \- P% C. U6 C5 R
d) 1) For luminaires without drain holes, there shall be no water entry.! h! o4 @2 j* w2 I& z/ u
NOTE Care should be taken not to mistake condensation for water entry.& G N# z, `! S9 r3 H5 H, d
2) For luminaires with drain holes, water entry including condensation is allowed during the3 V% C1 |7 o5 }
tests if it can drain out effectively and provided it does not reduce the creepage and: F: T, ]- k# X* l7 @/ a: s6 I X1 G
clearance distances below the minimum levels specified in the standard;7 ?; U3 I$ }: q* ^, G0 H& 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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