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songbolove 发表于 2012-2-2 09:12  # r# a5 [% ] J1 j" l
以GB7000.5 道路与街路照明灯具为例：
' k% P/ d4 e3 B, G7 \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
3 \3 H2 w! R1 W- d) J) T6 H6 n* {exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
$ ^! g5 L+ I: H q; @for the user or surroundings, for example, where it could reduce the creepage distances$ T8 q+ B/ [; X$ j% n- m
below the values specified in Section 11;. X6 i! l2 S$ s4 p$ q$ s
d) 1) For luminaires without drain holes, there shall be no water entry.4 a4 R0 S6 o6 Q9 j% v+ W4 m4 k
NOTE Care should be taken not to mistake condensation for water entry.+ M9 c1 y: ?" L1 @- ?
2) For luminaires with drain holes, water entry including condensation is allowed during the
* Z8 ~1 W& U% w2 ftests if it can drain out effectively and provided it does not reduce the creepage and
- b) f0 s6 ^0 v. N. Wclearance distances below the minimum levels specified in the standard; w( R4 e# {4 f8 p; e: u" t2 }' ^+ o
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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