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dengwx 发表于 2013-6-22 09:05  4 X0 T/ P w8 Q+ U5 j1 s
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：4 c% Z# S7 q4 P/ m
– components in PRIMARY CIRCUITS;
: F$ d) S4 Z4 w( o– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
7 l3 e0 D$ }: y: D" S% P- Y: |5 lspecifie in 2.5;
# \/ T1 x' |, ?/ L1 `– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
, G+ }2 t! b# J% m" \2.5, but not mounted on material of V-1 CLASS MATERIAL;5 b7 ]" D' K6 m4 ?. M8 i
– components within a power supply unit or assembly having a limited power output
N, P* E) P! W+ N0 Ras specifie in 2.5, including overcurrent protective devices, limiting impedances,# c* _3 U5 P* _ x8 j( F
regulating networks and wiring, up to the point where the limited power source output9 `2 ?# h% H. N m+ M) {( z% v
criteria are met;
1 z3 u! ]# p( ^3 @( J* u! t– components having unenclosed arcing parts, such as open switch and relay ]# ]. g5 v% ~8 t
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
) I) Q2 l; `2 V- _; _+ oLEVEL; and
/ _0 Y3 @! U/ E: `4 ]: ^– insulated wiring. |
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发表于 2013-6-22 09:38
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