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songbolove 发表于 2012-2-2 09:12 7 V* L h5 ]% `4 i) l# A
以GB7000.5 道路与街路照明灯具为例:3 W& w3 `* ~, j: Y
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, ...
* x6 i8 Y2 C# C& f1 G, {' dc) no trace of water on current-carrying parts or SELV parts where the voltage under load. o# u+ g; ^4 o( `7 A. C
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
' f. O7 R! U, N5 wfor the user or surroundings, for example, where it could reduce the creepage distances
* V# @; U! K; U/ n! k6 Fbelow the values specified in Section 11;
9 c$ W; g% }1 C4 ?d) 1) For luminaires without drain holes, there shall be no water entry.) Q6 o7 o" b( R7 v$ z. v
NOTE Care should be taken not to mistake condensation for water entry.6 r! x p/ Y8 K% H( i6 j' H2 k9 j
2) For luminaires with drain holes, water entry including condensation is allowed during the
- E4 E4 ]' x7 |6 i2 {tests if it can drain out effectively and provided it does not reduce the creepage and( s1 j% L4 E1 x& C' j" A1 D
clearance distances below the minimum levels specified in the standard;! Z; M) Q" c9 U1 E
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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