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songbolove 发表于 2012-2-2 09:12 
$ k p2 E5 r* L! c# U8 l! q以GB7000.5 道路与街路照明灯具为例： u, u3 l4 c. _+ u3 S7 {
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) \, B. _9 V; ~ l& N# r+ M% F& P
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
) y2 ?; \5 [0 r- E+ C+ p6 Lfor the user or surroundings, for example, where it could reduce the creepage distances
( H5 u0 D, o# q) v0 @2 ?# |below the values specified in Section 11;! Y: ~. Y# O3 q8 j, O+ v1 p
d) 1) For luminaires without drain holes, there shall be no water entry.0 U1 Q# Z, x4 u8 U' w' G7 J
NOTE Care should be taken not to mistake condensation for water entry.* ^- f0 K: i; ^2 L
2) For luminaires with drain holes, water entry including condensation is allowed during the$ P7 B0 y9 X' m' U% R3 m
tests if it can drain out effectively and provided it does not reduce the creepage and/ u' \6 Z1 d( h p: g5 ?
clearance distances below the minimum levels specified in the standard;
& D& ^5 }# t, M8 K2 S$ ~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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发表于 2012-4-29 13:36
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