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songbolove 发表于 2012-2-2 09:12  ' B. C( D8 P7 O1 B
以GB7000.5 道路与街路照明灯具为例：
4 m1 l0 H3 v y7 O! y/ }+ t: p$ C2 z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， ...
" u5 T1 K( z% m3 l' T4 bc) no trace of water on current-carrying parts or SELV parts where the voltage under load
1 V% B6 f! T+ s' Sexceeds 12 V r.m.s. or 30 V ripple-free d.c. or on insulation where it could become a hazard
/ t* h6 q$ M! T1 m# R4 Tfor the user or surroundings, for example, where it could reduce the creepage distances! s& e% j+ O) c0 n! Q V- ~; U! N3 T2 O+ N
below the values specified in Section 11;
' B% c! |, f4 E/ U0 Q, ^9 q8 A1 \( F( `0 e2 [d) 1) For luminaires without drain holes, there shall be no water entry.: e; q) i- i* }
NOTE Care should be taken not to mistake condensation for water entry.$ u/ m' K+ N6 Y: e5 d
2) For luminaires with drain holes, water entry including condensation is allowed during the J6 I& i1 ~1 q! z, r
tests if it can drain out effectively and provided it does not reduce the creepage and
3 e" f: x* p6 ?; I- U; eclearance distances below the minimum levels specified in the standard;
D' h; [$ l9 _3 D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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