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songbolove 发表于 2012-2-2 09:12 
# Q! e8 a0 A' `/ h% ~以GB7000.5 道路与街路照明灯具为例：2 }& e: |! j [( ], E4 ?
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. Y6 M' [' n6 ^% p" R' W) I
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard, H8 A+ q+ j0 C- I+ P! R
for the user or surroundings, for example, where it could reduce the creepage distances% n) [8 z; k1 h0 U; L2 G
below the values specified in Section 11;
3 d7 Y' z6 j7 d7 od) 1) For luminaires without drain holes, there shall be no water entry.: }1 X8 n" K" c G0 z- U" P& J6 A
NOTE Care should be taken not to mistake condensation for water entry.
9 n" _, C3 ^/ d2) For luminaires with drain holes, water entry including condensation is allowed during the
% h' V3 u$ P8 x1 @1 |) E6 atests if it can drain out effectively and provided it does not reduce the creepage and- a8 {) S" O. d6 A' v0 H
clearance distances below the minimum levels specified in the standard;
; n4 ~3 t' K( S2 l6 x- w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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