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If the following materials and parts are not separated from a PIS according to the
% h7 }( ?7 q: _+ A. D* Grequirements of 6.4.7, then the materials and parts shall not ignite during single fault6 V: T+ ^. s: R5 R$ Q+ ?5 U
conditions as specified in 6.4.3.2:
6 K" o" I) B' x5 C8 t, V– supplies, consumable materials, media and recording materials; and/ s: k+ h- G0 C& d8 y
– parts that are required to have particular properties in order to perform intended functions,; t: U4 F$ r8 l
such as synthetic rubber rollers, ink tubes and material requiring optical characteristics* b* J7 q1 C( U- V
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: C6 g4 z- W' I8 _9 ]
/ G$ D. M1 i; a C& s. R3 e( [, S7 G– by providing a fire enclosure as specified in 6.4.8. b7 h. [; w( q$ z! B( \! t0 C2 ?
Within the fire enclosure, combustible materials that do not comply with the flammability6 P, k: \; R9 I, `( s6 { m
requirements for PS2 or PS3 circuits shall comply with the flammability test of Clause S.1 or8 O- P7 A7 Q9 h1 @; D" F+ C
be made of V-2 class material, VTM-2 class material or HF-2 class foamed material.
7 o! G" B# x E5 \These requirements do not apply to:
" O$ k1 x# ^+ G, ]5 U% ^& y& O– parts with a volume of less than 1 750 mm3;! x& {5 D9 B/ ]: o& n5 ]
– parts with a mass of combustible material of less than 4 g;
5 U+ a' R7 o. F/ y6 J7 ~" I– supplies, consumable materials, media and recording materials;
4 h8 { C+ I+ s. y$ e7 @– parts that are required to have particular properties in order to perform intended functions,
- x2 z4 p, s/ J1 ?" Nsuch as synthetic rubber rollers, ink tubes and material requiring optical characteristics;7 N! l# e- S( r) P3 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。
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