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dengwx 发表于 2013-6-22 09:05  / {$ f1 |) Y, u0 O+ M. _
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：; C/ v+ ]" m! W
– components in PRIMARY CIRCUITS;
8 X7 T" C& G: [5 ~9 T0 R– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
z; e2 D8 d2 z V8 nspecifie in 2.5;
4 y' U" |7 C; `8 ~3 q: Y' Z– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in- a( n3 w+ k% {' C0 p
2.5, but not mounted on material of V-1 CLASS MATERIAL;
, b; N) K5 @' J' x$ s. D– components within a power supply unit or assembly having a limited power output
# S( _6 A A7 J8 |* G- tas specifie in 2.5, including overcurrent protective devices, limiting impedances,0 o3 j. Q/ d0 B7 Z% P7 y( b. D
regulating networks and wiring, up to the point where the limited power source output+ t* {" t+ D8 k! v7 q& m
criteria are met;- J4 N0 {7 U0 `9 p9 T& z7 b5 u) ^
– components having unenclosed arcing parts, such as open switch and relay! h( u% @/ ?2 E* t- U" d
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
( t5 W& C2 _! j8 v" Q: yLEVEL; and
: O; P& {$ q: A) ^3 N8 P4 T8 g– insulated wiring. |
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发表于 2013-6-22 09:38
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