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If the following materials and parts are not separated from a PIS according to the4 A; F/ _& g( U, t# N- L
requirements of 6.4.7, then the materials and parts shall not ignite during single fault
' d/ b( O6 U9 x5 ^conditions as specified in 6.4.3.2:
/ o) ~' p: i" q: _3 y) @6 M– supplies, consumable materials, media and recording materials; and
7 l$ M5 X d7 o1 z6 l( r– parts that are required to have particular properties in order to perform intended functions,
1 F# F# I, \) Lsuch as synthetic rubber rollers, ink tubes and material requiring optical characteristics, I- `" {" G+ O3 A# i) 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1 M- y( c9 p6 {. {. ]
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– by providing a fire enclosure as specified in 6.4.8.
* S2 ]0 L- {! }; l9 A2 `! i9 LWithin the fire enclosure, combustible materials that do not comply with the flammability
' j* ]/ S. k, @) P8 [" brequirements for PS2 or PS3 circuits shall comply with the flammability test of Clause S.1 or4 P: {4 t7 w& q" O9 a/ W
be made of V-2 class material, VTM-2 class material or HF-2 class foamed material.
6 Y( O; ?7 P [, \* X7 o2 B) IThese requirements do not apply to:
% T! K" v0 {6 N2 T+ ]5 y– parts with a volume of less than 1 750 mm3;8 D9 e% F' E2 ~4 C# v9 U4 I
– parts with a mass of combustible material of less than 4 g;( U8 Q( V* P1 e% |" L* X
– supplies, consumable materials, media and recording materials;6 i: v8 f" g* @3 ]$ c5 c
– parts that are required to have particular properties in order to perform intended functions,
3 V: b% {& q/ o* F, S' Wsuch as synthetic rubber rollers, ink tubes and material requiring optical characteristics;) r% e+ ?* N( _2 K& b+ g
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。* P0 F* F4 H2 E ^( `+ ~) }9 r
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