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dengwx 发表于 2013-6-22 09:05 
7 D. n; E; T, b( C& ^% P) N反问，怎么判定产品是否需要防火型外壳呢？
下面这些都需防火外壳：
+ D0 r4 h0 ^, w, n– components in PRIMARY CIRCUITS;( P0 z* b s. H5 x. j. N7 {
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
4 ]1 R: K2 I+ E% [2 F% O0 V6 W% lspecifie in 2.5;
+ U# }# i1 g! G% h' l8 q– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in* _7 }& D2 p& Z) Y$ _4 v
2.5, but not mounted on material of V-1 CLASS MATERIAL;5 y& o1 D. f+ v( O, ]
– components within a power supply unit or assembly having a limited power output$ ~* q. l2 {; h: d3 _" h
as specifie in 2.5, including overcurrent protective devices, limiting impedances,# C8 s$ c4 n# K" J( }* i
regulating networks and wiring, up to the point where the limited power source output
6 f$ | E2 I! Z9 G$ jcriteria are met;) V+ t6 d7 B% f+ n0 H
– components having unenclosed arcing parts, such as open switch and relay$ N' U- p) U5 X( ^
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
8 x3 f7 c7 P" ^+ {& ]* o4 z' U4 WLEVEL; and; R! G/ Q6 s4 f3 c+ `1 T
– insulated wiring. |
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发表于 2013-6-22 09:38
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