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songbolove 发表于 2012-2-2 09:12 . V& k, f3 L4 x6 s/ Q7 k) L
以GB7000.5 道路与街路照明灯具为例:" C/ |9 A9 O7 r9 p! N% C9 c B4 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, ...
$ P* @' J5 E" {5 e2 E1 uc) no trace of water on current-carrying parts or SELV parts where the voltage under load* E3 }8 ?! H2 |7 w
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
. g. @- O7 y) ?+ i+ `7 A$ Z( Jfor the user or surroundings, for example, where it could reduce the creepage distances7 W& t, h) |$ H( M9 I- J
below the values specified in Section 11;
P, Z8 h# o4 I' `d) 1) For luminaires without drain holes, there shall be no water entry.
6 h: W, m" D. Z6 fNOTE Care should be taken not to mistake condensation for water entry.% w* k5 ?3 e, c6 o1 w
2) For luminaires with drain holes, water entry including condensation is allowed during the0 X. B. B0 {" `* L9 A3 N
tests if it can drain out effectively and provided it does not reduce the creepage and, d5 q) a" S3 b' |1 J. k
clearance distances below the minimum levels specified in the standard;9 H6 U7 I7 C/ P7 R+ N
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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