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dengwx 发表于 2013-6-22 09:05 
, \- M1 f, ?+ H8 V, P5 i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：
& X K, m0 }# ]" o% X. n– components in PRIMARY CIRCUITS;) l# ^- ?3 Y) U) r
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
6 O: {/ L z# o" N+ P' l3 s( ]( Yspecifie in 2.5;" F+ c J6 A: @/ f- Q2 i4 L
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in* M' t9 q$ T9 v* H+ Z& W5 D( _
2.5, but not mounted on material of V-1 CLASS MATERIAL;% }9 \& p; X( S
– components within a power supply unit or assembly having a limited power output
1 A; g# g- W- o6 Z$ [as specifie in 2.5, including overcurrent protective devices, limiting impedances,
/ Q6 e" m$ m* s/ k: b: ~+ sregulating networks and wiring, up to the point where the limited power source output0 p) a" U E4 W: y5 M% k
criteria are met;! i1 a6 y8 |! R, A( d
– components having unenclosed arcing parts, such as open switch and relay
/ F9 U% ^. P! econtacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY: R9 `9 ]& X+ I
LEVEL; and" j" Z* b! M' c* j- h
– insulated wiring. |
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发表于 2013-6-22 09:38
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