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：
– components in PRIMARY CIRCUITS;
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
specifie in 2.5;
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in
2.5, but not mounted on material of V-1 CLASS MATERIAL;
– components within a power supply unit or assembly having a limited power output
as specifie in 2.5, including overcurrent protective devices, limiting impedances,
regulating networks and wiring, up to the point where the limited power source output
criteria are met;
– components having unenclosed arcing parts, such as open switch and relay
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
LEVEL; and
– insulated wiring. 要看你的产品是哪类别的，ClassI/ClassII/ClassII
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