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songbolove 发表于 2012-2-2 09:12 
; y9 N% _* x) X# t2 J& x以GB7000.5 道路与街路照明灯具为例：
" e. d% x2 h' o; {3 x! d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， ...
" s( g4 \" v; }5 Zc) no trace of water on current-carrying parts or SELV parts where the voltage under load
% U8 D% Y# m# W v* d4 m% hexceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard$ Y+ V7 f* c0 ?5 }
for the user or surroundings, for example, where it could reduce the creepage distances
# p1 T% G, ]- f# @- }* Nbelow the values specified in Section 11;3 ^3 D: L4 E- G
d) 1) For luminaires without drain holes, there shall be no water entry.
) H9 a) G# n1 D% I aNOTE Care should be taken not to mistake condensation for water entry.
0 y. U, ]4 [! P5 s. y$ D2) For luminaires with drain holes, water entry including condensation is allowed during the
$ S/ ~; u: D ^ J- o4 Xtests if it can drain out effectively and provided it does not reduce the creepage and/ U& s- K' u) x* u2 \
clearance distances below the minimum levels specified in the standard;
7 F5 o1 h" ~" j1 k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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