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dengwx 发表于 2013-6-22 09:05 
9 ]% p% I) S- w/ z* Y5 Q* u7 P4 ~反问，怎么判定产品是否需要防火型外壳呢？
4 q, [+ ? @1 G下面这些都需防火外壳：$ \; _+ a" q2 V
– components in PRIMARY CIRCUITS;
4 h7 d5 Y4 @! h7 R– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
( O, k8 N# V* ]1 Y; Kspecifie in 2.5;
- t1 ^7 V J# j* R4 ~* V3 g* G– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in/ y2 a4 W% y7 ~; o7 n, Z* {
2.5, but not mounted on material of V-1 CLASS MATERIAL;
6 S, a6 h0 y6 [( ~' y) P" Q$ b– components within a power supply unit or assembly having a limited power output
o8 _ Q/ V; K3 ?& ias specifie in 2.5, including overcurrent protective devices, limiting impedances,
) y) X( F* ?6 S# Oregulating networks and wiring, up to the point where the limited power source output
# ~2 `. l: G6 A% Qcriteria are met;
* U2 Z" {$ F; l: q2 k– components having unenclosed arcing parts, such as open switch and relay1 p4 l4 P) w. M/ F$ _' J$ k/ \
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY. D* P8 v }! r9 ^ j4 t- \
LEVEL; and
! @1 U$ r( n- L/ R– insulated wiring. |
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发表于 2013-6-22 09:38
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