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dengwx 发表于 2013-6-22 09:05 
7 {# ~: `5 L5 K; r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：" E. j, r3 [+ G- L# f( `2 t
– components in PRIMARY CIRCUITS;
1 Z3 b+ a- t: ?3 H– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
9 _0 q# p' \$ L) p1 _2 r" Aspecifie in 2.5;
2 T& z x# M; I$ J0 j" Q– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in; E* V# y/ A3 W9 O# N( @
2.5, but not mounted on material of V-1 CLASS MATERIAL;6 @( F9 ~! n4 B& U* O' d
– components within a power supply unit or assembly having a limited power output
* e* z) U/ b' w. b, R5 e4 las specifie in 2.5, including overcurrent protective devices, limiting impedances,
4 `5 K' V0 [" n& l+ D, z. p' ^! n, kregulating networks and wiring, up to the point where the limited power source output) Q0 a0 x9 d5 M/ b; T6 X
criteria are met;; n4 u- _, g2 h) C- E8 w
– components having unenclosed arcing parts, such as open switch and relay3 Y1 |/ Q# t2 ^1 x9 k* Y
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY( H' U) p3 N9 x0 U- g; {
LEVEL; and
" B4 _- C: `) G# @– insulated wiring. |
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发表于 2013-6-22 09:38
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