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dengwx 发表于 2013-6-22 09:05  5 d% [& |( U: p4 |9 `7 i: }/ l! w: w
反问，怎么判定产品是否需要防火型外壳呢？
6 b m% U+ ^2 w% z% ~% A. ~( p4 D. E下面这些都需防火外壳：
* W+ w" v* Z: d& j– components in PRIMARY CIRCUITS;
: Q# K3 D$ _ l& u5 H– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
) n& S) `( ~2 b' [% i- uspecifie in 2.5;
, G8 a7 ~- _9 Y; k( P' _– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in5 c9 T* c0 V$ x) D. R
2.5, but not mounted on material of V-1 CLASS MATERIAL;
9 W! }0 _7 U2 L– components within a power supply unit or assembly having a limited power output2 Z$ c9 A5 D# \4 p7 k9 F' I, l
as specifie in 2.5, including overcurrent protective devices, limiting impedances,+ \ H% P/ f7 r' a" J
regulating networks and wiring, up to the point where the limited power source output
1 C9 J$ |5 q+ Q5 X e( Acriteria are met;
) |. S, v0 i& N5 L+ Q( d– components having unenclosed arcing parts, such as open switch and relay( C9 D+ `. x7 f$ x
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
/ C6 ?# N0 W* A( B: bLEVEL; and/ i) U3 `4 E2 |( o+ Z
– insulated wiring. |
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发表于 2013-6-22 09:38
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