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dengwx 发表于 2013-6-22 09:05
' h7 f3 K1 h$ J反问,怎么判定产品是否需要防火型外壳呢?
1 R# e, Z( _, w; p# N下面这些都需防火外壳:% W. @! V+ Z% t; o l' i
– components in PRIMARY CIRCUITS;+ W' [ g9 i* D' p
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits$ ]5 Y3 n5 \ i5 V
specifie in 2.5;
( h) A3 ?% A+ b- x8 W8 L5 l– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in2 {8 p, h+ o8 x$ r/ M9 U3 r
2.5, but not mounted on material of V-1 CLASS MATERIAL;, v9 l' G4 t c4 I/ Z3 R3 G
– components within a power supply unit or assembly having a limited power output
, Z. q" K* I0 b E6 |# das specifie in 2.5, including overcurrent protective devices, limiting impedances,6 Z# W8 e& T8 |6 E
regulating networks and wiring, up to the point where the limited power source output
6 l3 P8 J% X k5 l. M/ Tcriteria are met;
* Z4 C) O/ a4 S2 K% y– components having unenclosed arcing parts, such as open switch and relay) P- ]( A# Z! B9 k
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
& h, w K6 ]7 u6 J% T" dLEVEL; and
1 S$ G% j2 j0 Z$ x7 q4 ]1 m– insulated wiring. |
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