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dengwx 发表于 2013-6-22 09:05 
2 v6 W; M" H0 i$ {1 k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 _& ?4 r1 `# C7 ~, Q/ [3 h( H
– components in PRIMARY CIRCUITS;7 V* ?( o% s2 P- B8 I! T/ [$ `1 c$ R
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
9 D# u7 q- }$ G0 i& y: \specifie in 2.5;
7 h# f+ `6 R+ T7 X– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
- F" i) R4 J6 }9 j1 e2.5, but not mounted on material of V-1 CLASS MATERIAL;
! I7 ?. D3 q0 x2 T" D3 o7 M– components within a power supply unit or assembly having a limited power output
6 B8 f; L% u$ }+ v! t, Sas specifie in 2.5, including overcurrent protective devices, limiting impedances,1 u. J9 J4 n5 y: ?! g V- o/ ?# i2 a
regulating networks and wiring, up to the point where the limited power source output6 F) \( k% Z; `( u
criteria are met;
5 S% {) Q) S$ M" |– components having unenclosed arcing parts, such as open switch and relay- M9 o S; I4 _! ^- ^8 `
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY5 g/ W) n9 Z2 ]6 z
LEVEL; and
5 o$ h2 e- j' }* K8 \9 t1 q* U; f– insulated wiring. |
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发表于 2013-6-22 09:38
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