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songbolove 发表于 2012-2-2 09:12 
; c( j& m0 N; g, a7 O" v以GB7000.5 道路与街路照明灯具为例:3 p9 r$ k; o. [* M& N. q9 L/ G
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, ... : x) L9 w5 B& I M: A7 _! h6 p
c) no trace of water on current-carrying parts or SELV parts where the voltage under load, y6 O: _/ p8 ~
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
( n1 r: u8 B x, g& K! s( Kfor the user or surroundings, for example, where it could reduce the creepage distances$ Q: j) a! T$ a; O0 q: E2 A( n
below the values specified in Section 11;1 E, G$ R* W* z* K J# w) n
d) 1) For luminaires without drain holes, there shall be no water entry.
6 S, J! [- p" pNOTE Care should be taken not to mistake condensation for water entry.3 Y$ O$ d7 r m4 ~( b1 a
2) For luminaires with drain holes, water entry including condensation is allowed during the
2 S3 f' d. k# f4 ^' P3 ]3 h+ G. G" Gtests if it can drain out effectively and provided it does not reduce the creepage and
- G! |5 M0 x, xclearance distances below the minimum levels specified in the standard;
. X& D' G- p( E9 V: U8 j9 q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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