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dengwx 发表于 2013-6-22 09:05  , E9 c1 ?: K3 s. p! X
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：
5 @6 a! L: {3 r2 ^; |* K– components in PRIMARY CIRCUITS;
) l7 p5 q! r. v8 E8 `2 V– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits' B4 W/ h% {5 P& c" l- t% X
specifie in 2.5;# G( f4 a" e% q) t9 U5 q: m
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
9 ?8 V# ]: T" X/ |3 [) u$ D4 e2.5, but not mounted on material of V-1 CLASS MATERIAL;* o. O$ [6 m9 b8 Q* N h
– components within a power supply unit or assembly having a limited power output
5 l: a! `4 ~+ M$ Y! Bas specifie in 2.5, including overcurrent protective devices, limiting impedances,9 o! Y' u' [' Q: Y9 Q: ]# i8 N
regulating networks and wiring, up to the point where the limited power source output" [" q* J; }/ s* D/ m
criteria are met;
& I4 I) V3 B0 N# \% g– components having unenclosed arcing parts, such as open switch and relay
: ]: Q, a& M; N- O% _contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY" h3 i, V6 i E0 g& b4 t/ Q3 U
LEVEL; and. T2 [" C) i, P8 }
– insulated wiring. |
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发表于 2013-6-22 09:38
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