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dengwx 发表于 2013-6-22 09:05 
( }9 h v( l/ @8 F4 c3 {% n反问，怎么判定产品是否需要防火型外壳呢？
: O7 z4 Q. y! e/ B3 L下面这些都需防火外壳：+ F2 U4 ]4 E/ A
– components in PRIMARY CIRCUITS;
( K4 ]* d! Z' e. l4 w9 ^7 @3 z# g– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits& k7 x' P; B8 r8 l
specifie in 2.5;2 Y* B6 Z, e4 |
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
$ i. D- Z0 e( r! G5 _' O i, q2.5, but not mounted on material of V-1 CLASS MATERIAL;
. j3 _! P( |- g' |7 y* m, c– components within a power supply unit or assembly having a limited power output
0 @. c; w+ J/ v* [1 Tas specifie in 2.5, including overcurrent protective devices, limiting impedances,
5 C) c: b: N; bregulating networks and wiring, up to the point where the limited power source output
7 T' V+ M9 [& G. q7 C/ k' o( acriteria are met;
: B% U* N2 c( w1 T3 }– components having unenclosed arcing parts, such as open switch and relay
! Y# e, h+ T. r. e9 q0 R8 Bcontacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY$ E I( m& a$ }$ O
LEVEL; and* F( i3 s% W# x! z
– insulated wiring. |
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