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dengwx 发表于 2013-6-22 09:05  ) q" [' T3 @! i/ {: J/ \- x* N# I
反问，怎么判定产品是否需要防火型外壳呢？
# A" e) A4 d; |. O) ]4 b k5 Z- C) I下面这些都需防火外壳：5 j- g. c1 u0 y' A2 `, I. y# E
– components in PRIMARY CIRCUITS;
8 H$ x2 n4 q' c– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
) ~0 Q: J3 Y8 Z" w7 F& e4 Uspecifie in 2.5;
! i/ q) q' \9 g+ Z2 [. Q– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in) L* A1 @8 w* ?. E* W% m: y
2.5, but not mounted on material of V-1 CLASS MATERIAL;. \. T2 y, r) U" t2 A
– components within a power supply unit or assembly having a limited power output
8 r6 S$ A- m' tas specifie in 2.5, including overcurrent protective devices, limiting impedances,6 ~4 ]4 O, X/ q+ n' U
regulating networks and wiring, up to the point where the limited power source output5 B+ S7 [! |: Y8 V4 K: r
criteria are met;# l1 h6 ^6 w) J2 y2 P1 a& Y0 s+ c# \' }
– components having unenclosed arcing parts, such as open switch and relay
& |& H3 c' t R9 i8 D5 mcontacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY+ i. ?( T! i; a. U9 `2 J2 a
LEVEL; and- i% q) }6 L8 O, [
– insulated wiring. |
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发表于 2013-6-22 09:38
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