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songbolove 发表于 2012-2-2 09:12  # G2 ]- o' q9 E8 ~3 J
以GB7000.5 道路与街路照明灯具为例：- K5 C' j; H& e; r. H4 b$ f
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， ...
+ _2 d; I8 M5 U5 ^1 W- tc) no trace of water on current-carrying parts or SELV parts where the voltage under load( k# s5 Q) X. l7 Z" ?9 U$ [
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
( D6 K+ i, y7 V+ k7 Sfor the user or surroundings, for example, where it could reduce the creepage distances" b# @+ D* N1 l5 u4 w' S3 Y( U
below the values specified in Section 11;3 c3 @! w: u* R5 G
d) 1) For luminaires without drain holes, there shall be no water entry.
: W0 a$ [% O( s% BNOTE Care should be taken not to mistake condensation for water entry.
9 r2 t" I" r* O2) For luminaires with drain holes, water entry including condensation is allowed during the
4 w- L9 V R; F/ V# H5 f9 N$ L) V* Qtests if it can drain out effectively and provided it does not reduce the creepage and
- X. |: o8 \- _# ?5 r6 fclearance distances below the minimum levels specified in the standard;# G* ?( m3 A9 E$ U
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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