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songbolove 发表于 2012-2-2 09:12 
" X9 l( L0 Z# h! T" f- W以GB7000.5 道路与街路照明灯具为例：) x2 \8 X \/ X, K0 p' H) \
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 @$ v$ k. v/ W; Oc) no trace of water on current-carrying parts or SELV parts where the voltage under load; R2 T2 ^* p" _: i y
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard& L* r3 c. f0 A5 m* C& c
for the user or surroundings, for example, where it could reduce the creepage distances9 p4 J. J( g+ \0 B$ z& z, g8 Y
below the values specified in Section 11;
" K# i0 h+ c7 zd) 1) For luminaires without drain holes, there shall be no water entry.- {' R" A3 g& V) a% C
NOTE Care should be taken not to mistake condensation for water entry.
! u/ @, H& y- f) h: B& ^0 G* o2) For luminaires with drain holes, water entry including condensation is allowed during the0 c _; {( g" j5 b) }; b& b
tests if it can drain out effectively and provided it does not reduce the creepage and
, q6 [* ?7 n7 t: E: y* Pclearance distances below the minimum levels specified in the standard;* q2 J( C3 R9 D3 m
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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