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dengwx 发表于 2013-6-22 09:05  & w; R) k5 M0 T' o
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：
& M1 m/ Q- t* [– components in PRIMARY CIRCUITS;6 f& h6 E7 D6 k6 k0 R
– components in SECONDARY CIRCUITS supplied by power sources that exceed the limits
7 m% `. c+ }- m( A0 uspecifie in 2.5;6 K8 l! l0 ^4 P9 B% y5 A/ z: Y
– components in SECONDARY CIRCUITS supplied by limited power sources as specifie in5 M, x: i/ A/ P ]4 x* y. H0 z
2.5, but not mounted on material of V-1 CLASS MATERIAL;
4 o3 {) w7 U, Y) u1 \– components within a power supply unit or assembly having a limited power output0 {; b" J8 c# D( I% t" z
as specifie in 2.5, including overcurrent protective devices, limiting impedances,
# \& o& n1 R1 _: r3 E2 E3 H- jregulating networks and wiring, up to the point where the limited power source output
* O9 K. K" \$ b( H) z) Vcriteria are met;! h8 I/ A' l" W4 j6 ^
– components having unenclosed arcing parts, such as open switch and relay- W/ ^! _& A+ l3 ^
contacts and commutators, in a circuit at HAZARDOUS VOLTAGE or at a HAZARDOUS ENERGY
3 E7 R5 o* _# S: n7 z% {LEVEL; and- l5 c' O3 R$ X. e+ D; T9 O
– insulated wiring. |
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发表于 2013-6-22 09:38
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