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songbolove 发表于 2012-2-2 09:12  " S" C/ _+ K# H# m8 v8 R2 ~8 h; p
以GB7000.5 道路与街路照明灯具为例： F. l. t% N* g4 O. 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， ...
c) no trace of water on current-carrying parts or SELV parts where the voltage under load. n( u: P V3 b6 r
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
* ]8 H: B) t, h0 }for the user or surroundings, for example, where it could reduce the creepage distances& n9 Z: g; x$ ^8 u! c
below the values specified in Section 11;
" b6 n( v: G4 P' ?- H: w$ ed) 1) For luminaires without drain holes, there shall be no water entry.
( e/ `; u( y% A0 y' hNOTE Care should be taken not to mistake condensation for water entry.; c6 f# s9 m+ U) _/ j1 P
2) For luminaires with drain holes, water entry including condensation is allowed during the% a- C% l# E7 d3 i
tests if it can drain out effectively and provided it does not reduce the creepage and
2 ~ T; u+ b* a7 Tclearance distances below the minimum levels specified in the standard;
* [6 J( Q8 z6 L' h6 j; ]4 p) i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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