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songbolove 发表于 2012-2-2 09:12
V+ n" {, [+ _+ c7 X/ c以GB7000.5 道路与街路照明灯具为例:
/ }, p; q* p; m( i! K- v/ U; a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, ... % U9 r& l$ m3 l
c) no trace of water on current-carrying parts or SELV parts where the voltage under load6 s; h0 N. u2 F1 a/ _5 z
exceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard1 f/ a) a' Y% z
for the user or surroundings, for example, where it could reduce the creepage distances
5 q2 N# O! }0 r) ]8 Ybelow the values specified in Section 11;+ ~- x o' E8 ]5 b7 l: G
d) 1) For luminaires without drain holes, there shall be no water entry.
. t2 {3 Q2 O8 v9 R3 j; NNOTE Care should be taken not to mistake condensation for water entry./ F8 x% P p" X$ b( A
2) For luminaires with drain holes, water entry including condensation is allowed during the. @5 B1 ^- m6 T: u2 P, L+ e
tests if it can drain out effectively and provided it does not reduce the creepage and! x; [, J# |6 R+ f# f
clearance distances below the minimum levels specified in the standard;
# N3 g6 Z) E* F. S% k( L& W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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