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dengwx 发表于 2013-6-22 09:05  8 f ^% O0 Q2 B' I% w4 I* S3 _
反问，怎么判定产品是否需要防火型外壳呢？
: d6 \ T" h/ k1 ]1 q下面这些都需防火外壳：; @. u7 E$ h1 ?
– components in PRIMARY CIRCUITS;
6 X9 S; w' H2 o* x0 k. R– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
] ^) y/ [) Pspecifie in 2.5;" `6 ~6 O+ K/ B: p( u* G
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in7 ^6 W6 m) f; E2 d' y
2.5, but not mounted on material of V-1 CLASS MATERIAL;5 J: w$ C" x- h) f+ F: l
– components within a power supply unit or assembly having a limited power output
0 H# |/ i( d& S6 |as specifie in 2.5, including overcurrent protective devices, limiting impedances,
, F- {+ G1 p5 b3 g2 g; o3 Y# t/ ?regulating networks and wiring, up to the point where the limited power source output# L) I3 W& K/ A( _3 ~# b
criteria are met;. I. d/ |: V, _( Q/ P: Q
– components having unenclosed arcing parts, such as open switch and relay
1 [4 }. @1 g- l" F. A/ h% T: acontacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY8 v, Y, e6 Q/ x: R9 p
LEVEL; and
9 V6 W3 m9 @: B, ^5 H: Q" G% H– insulated wiring. |
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发表于 2013-6-22 09:38
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