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dengwx 发表于 2013-6-22 09:05 
! v+ s/ b* A* x3 o6 w7 _1 w反问，怎么判定产品是否需要防火型外壳呢？
* B$ Y; ^6 v- k+ }$ v下面这些都需防火外壳：
1 E0 D, i" b Q$ J9 b– components in PRIMARY CIRCUITS;
, ^6 i" _7 J5 H% S3 P1 e– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits; I) ]% N, f) ]% f+ d
specifie in 2.5;4 m0 K* c' z, f4 p* o: I
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
' P8 Q" J+ R/ {5 t. e2.5, but not mounted on material of V-1 CLASS MATERIAL;7 Q7 W4 ^+ u3 K( A# {" A
– components within a power supply unit or assembly having a limited power output
" \4 y# F* |3 i* E# cas specifie in 2.5, including overcurrent protective devices, limiting impedances,
& L+ P: Z3 X% z7 @( vregulating networks and wiring, up to the point where the limited power source output
5 t |6 C" J$ M. Dcriteria are met;
" V7 w) w( z* L- ]– components having unenclosed arcing parts, such as open switch and relay) |2 {4 n) f1 U1 U
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
, o4 L. C9 B( K1 v& Q4 `6 ]* _/ NLEVEL; and, B( t8 J% S- d2 B& ]# P1 M& B
– insulated wiring. |
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