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songbolove 发表于 2012-2-2 09:12 
* p3 [$ p# t7 m) @9 I# o) K6 j8 v以GB7000.5 道路与街路照明灯具为例：# W& a2 D, K6 @7 w
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， ...
- N e) Q% B! n, t, M5 k5 g7 A! T8 ac) no trace of water on current-carrying parts or SELV parts where the voltage under load
# ]0 B, l/ o J) L' Iexceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard K& Y1 w$ W* }
for the user or surroundings, for example, where it could reduce the creepage distances; q$ r# ^% F% ~
below the values specified in Section 11;, e8 ]% N# b! {
d) 1) For luminaires without drain holes, there shall be no water entry.9 Q, a2 J0 i Z3 |
NOTE Care should be taken not to mistake condensation for water entry.
3 U+ U' r1 j% L) X& X; s& \$ U; r( X2) For luminaires with drain holes, water entry including condensation is allowed during the! w, o/ _! x1 V% F2 q, t, o; z
tests if it can drain out effectively and provided it does not reduce the creepage and/ L% M. G5 | Q, c
clearance distances below the minimum levels specified in the standard;
. y" u- K# N$ }+ x, L6 y' T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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