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dengwx 发表于 2013-6-22 09:05  5 ^% O# \/ M+ 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：
9 V: F3 ^$ _2 Q+ T' \1 u– components in PRIMARY CIRCUITS;
/ S7 {! a4 g0 |( u5 X" n– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits2 T, `5 p A6 S! G' K/ _& Z
specifie in 2.5;" E# ~+ u+ G+ v+ P
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in7 Z7 w% H$ d% s
2.5, but not mounted on material of V-1 CLASS MATERIAL;
+ i# M& {1 c0 ^0 k! X! a– components within a power supply unit or assembly having a limited power output7 C3 T1 U4 c! O% ?
as specifie in 2.5, including overcurrent protective devices, limiting impedances,
+ T! q! e. c) s7 _( G3 rregulating networks and wiring, up to the point where the limited power source output: Y" a; _0 `6 J; u+ X
criteria are met;
( H0 v. ^' h* f4 V0 a– components having unenclosed arcing parts, such as open switch and relay
* k0 S/ U: ^* m4 K% K0 }7 ^contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY/ y9 y. R! v3 {% R" ~
LEVEL; and; U$ ]3 }- U5 ?
– insulated wiring. |
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发表于 2013-6-22 09:38
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