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dengwx 发表于 2013-6-22 09:05  8 O8 L! K2 m, ]% A6 s
反问，怎么判定产品是否需要防火型外壳呢？
, X' |, H- a4 n* R: y H6 {下面这些都需防火外壳：3 k8 R# R( p0 u! d+ q6 Q7 v/ z
– components in PRIMARY CIRCUITS;
4 b- {8 d1 i1 k5 ^– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
0 N: }0 ~5 `: ^specifie in 2.5;
, x2 z, A3 w& G* q4 m– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
( e) k/ G* K; j8 `0 t2.5, but not mounted on material of V-1 CLASS MATERIAL;0 O# C3 n$ j- m+ U8 z
– components within a power supply unit or assembly having a limited power output
) v% P p: T. |: @as specifie in 2.5, including overcurrent protective devices, limiting impedances,
$ k v, a* J/ _. w1 l/ ?* y+ Bregulating networks and wiring, up to the point where the limited power source output
0 i* Z% |+ ? q. Lcriteria are met;
7 Q) H- J3 |: q' c2 u, {– components having unenclosed arcing parts, such as open switch and relay
3 u9 D# ?/ X1 P u3 kcontacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
/ k+ ^7 ]( ~2 xLEVEL; and
) s. u* n) r9 M– insulated wiring. |
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发表于 2013-6-22 09:38
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