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If the following materials and parts are not separated from a PIS according to the, {$ E* X" x% @8 }5 d$ w0 V: L, F
requirements of 6.4.7, then the materials and parts shall not ignite during single fault* f2 L, N( H- B3 d/ i5 A
conditions as specified in 6.4.3.2:
# y* t3 l8 _' O. _– supplies, consumable materials, media and recording materials; and6 r4 J3 j9 g( J7 j' i
– parts that are required to have particular properties in order to perform intended functions,9 D% ]7 m7 E$ `
such as synthetic rubber rollers, ink tubes and material requiring optical characteristics" c" O* e( F; ^& }" O) p; e
PS2中有明确写到补给材料，介质或消耗材料要与PIS进行隔离，要满足5或13的要求，否者用6.4.3.2的单一故障去豁免5 C2 g/ p: l- M
$ r& N. n) }8 b
– by providing a fire enclosure as specified in 6.4.8.6 B% A9 n8 p8 G* h; K+ Z/ B/ n
Within the fire enclosure, combustible materials that do not comply with the flammability
7 X3 b% ^# j1 h: ~; M: r, G, i* \requirements for PS2 or PS3 circuits shall comply with the flammability test of Clause S.1 or( l/ x: A: w/ T' ?6 N
be made of V-2 class material, VTM-2 class material or HF-2 class foamed material.
9 T- y @. K$ j! o) W: Y! C- T l0 M1 YThese requirements do not apply to:
0 x6 L* K, P# H; ?- M– parts with a volume of less than 1 750 mm3;' r5 |: c" }& F1 m
– parts with a mass of combustible material of less than 4 g;
) m. a5 ^$ V! m% [3 Z. G– supplies, consumable materials, media and recording materials;
; A7 F( n, e- J0 l– parts that are required to have particular properties in order to perform intended functions,
- z: B% c" |( ]$ csuch as synthetic rubber rollers, ink tubes and material requiring optical characteristics;
1 o# f( X) v- i7 W+ ^! q/ |: \. k按6.4.8的规定提供防火防护外壳（V-1),不符合PS2或PS3电路一部分的可燃性材料应符合第S.1章的可燃性试验或应用V-2级材料、VTM-2级材料或HF-2级泡沫材料制成，那么这个时候不考虑PIS的距离的问题，如果材料不符合上述要求，用V-0防火防护外壳或者材料安装在V-1印制板上（考虑PIS距离要求），不知道我的理解是否正确，是因为补给材料，介质或消耗材料无法满足V-2或S.1的要求，所以说不适用吗？？那么一个终端产品，定期要更换这些材料，是否像PS2要与PIS进行隔离，个人认为要的。& T) |+ C. k5 q0 k2 p% h8 e
1 z+ Q3 P0 D/ Q* \( X( v! u/ M! q1 P
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发表于 2021-11-29 14:24
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