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dengwx 发表于 2013-6-22 09:05 
, a9 P. @8 q; K3 ^0 Z, b: |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：
( [2 E& |: c( p! A– components in PRIMARY CIRCUITS;9 n. ]0 {$ a3 u, q$ Y
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
+ x$ N: k5 t$ C; a& e- ?specifie in 2.5;
O; m( i n7 D, n+ J' B– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in, [. X4 Y9 n/ H+ g B. U Y# F
2.5, but not mounted on material of V-1 CLASS MATERIAL;
/ i$ ~1 \+ n5 k0 f9 \: ?. i– components within a power supply unit or assembly having a limited power output) h: ?' f5 t7 o5 r1 Y! m
as specifie in 2.5, including overcurrent protective devices, limiting impedances,% i' q! A, N$ o: w) N( h
regulating networks and wiring, up to the point where the limited power source output6 G+ L2 V+ U6 Y I
criteria are met;' ]% ?9 S" Y% b, T! z
– components having unenclosed arcing parts, such as open switch and relay3 Q, Z/ g- M* f$ X0 S
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
# J9 l' j( G: X E) qLEVEL; and( c' z8 K$ b' a* }' `. a4 M
– insulated wiring. |
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发表于 2013-6-22 09:38
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