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songbolove 发表于 2012-2-2 09:12 
' y& x$ I- a, \! D" B% T6 d6 i2 o以GB7000.5 道路与街路照明灯具为例：
" e2 P' ] Z: T( \ ]8 K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
" Y% O) [2 ~2 \& ~% O8 Z. P7 l3 _exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
: s2 N$ U0 n1 Q0 q4 P- p& pfor the user or surroundings, for example, where it could reduce the creepage distances
. H2 o3 }# E3 b# ` Abelow the values specified in Section 11;' g6 U; s/ W& O( ^
d) 1) For luminaires without drain holes, there shall be no water entry.4 s: ]" l: P3 E0 V8 e* P1 c( ?
NOTE Care should be taken not to mistake condensation for water entry.; p/ K6 C; U. ]8 W8 e+ h
2) For luminaires with drain holes, water entry including condensation is allowed during the6 p% @. ] V, j/ b
tests if it can drain out effectively and provided it does not reduce the creepage and0 ]5 P W2 a, Y3 h! L" e+ D
clearance distances below the minimum levels specified in the standard;& c0 s/ I/ {# ], |7 R0 p& v3 y
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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