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dengwx 发表于 2013-6-22 09:05  ) T) ^; p/ e7 Q: n( ~) Q
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：. N3 z/ _; M% T
– components in PRIMARY CIRCUITS;9 ?" n5 V/ Z! d k- F
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits: o+ i# Z7 h* N
specifie in 2.5;
( F' s3 C4 I# ~* L( @– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
- n7 b+ n! B6 s. r2.5, but not mounted on material of V-1 CLASS MATERIAL;
6 D! W! [2 ~/ j+ H$ Z3 l- |– components within a power supply unit or assembly having a limited power output
! H% |) w7 u1 mas specifie in 2.5, including overcurrent protective devices, limiting impedances,) S# y7 ]' d# x( ]6 S8 j
regulating networks and wiring, up to the point where the limited power source output
( f0 X0 D0 W6 D0 rcriteria are met;2 f. B" u9 m+ y+ d0 t
– components having unenclosed arcing parts, such as open switch and relay* w8 h/ n7 m; ^& n( k) h7 q% C9 C
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY, y# R, x, h2 c
LEVEL; and" w3 I* C/ D _$ E
– insulated wiring. |
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发表于 2013-6-22 09:38
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