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songbolove 发表于 2012-2-2 09:12  ; Z5 x6 X' H2 d0 N% V
以GB7000.5 道路与街路照明灯具为例：
3 _: \% D& g, R; D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( N+ S" G- S# f. ]! f* d
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
8 C! Q8 t: e/ h, z; ` Afor the user or surroundings, for example, where it could reduce the creepage distances
1 T* @; I. w4 a$ M, u+ F# ` Jbelow the values specified in Section 11;
5 B4 c' D! [3 ]d) 1) For luminaires without drain holes, there shall be no water entry.
/ x. M) @+ Q/ W \0 L/ \' }4 bNOTE Care should be taken not to mistake condensation for water entry.+ e; s( g9 b" o2 M) M2 H, \4 J
2) For luminaires with drain holes, water entry including condensation is allowed during the
9 B1 Z/ m+ e2 N9 a" h* Otests if it can drain out effectively and provided it does not reduce the creepage and
, y8 g4 K4 H) Y. z1 m3 X/ Oclearance distances below the minimum levels specified in the standard;6 M4 o4 N1 |7 B
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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