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If the following materials and parts are not separated from a PIS according to the
: ?( d* z$ |6 a/ {" t$ jrequirements of 6.4.7, then the materials and parts shall not ignite during single fault _) R+ N) r# ?) G# D& p6 C
conditions as specified in 6.4.3.2:/ F5 \1 m2 o8 m# E
– supplies, consumable materials, media and recording materials; and
+ H; z, u( F$ w/ P– parts that are required to have particular properties in order to perform intended functions,; A+ c1 j& n1 t
such as synthetic rubber rollers, ink tubes and material requiring optical characteristics
. X# f$ o1 D' Q/ ]5 }2 HPS2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
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* i- |* l! Y/ W. M4 u X– by providing a fire enclosure as specified in 6.4.8.
8 x: d& x1 ~* B: N2 o FWithin the fire enclosure, combustible materials that do not comply with the flammability
9 U% @' ^/ @# ]; z1 f' a( z7 rrequirements for PS2 or PS3 circuits shall comply with the flammability test of Clause S.1 or0 W$ X/ v) V$ g# c, t
be made of V-2 class material, VTM-2 class material or HF-2 class foamed material.
; I: j2 Z! V2 r/ d2 |0 w8 mThese requirements do not apply to:
8 |4 ?9 j! G; J4 ?– parts with a volume of less than 1 750 mm3;
- ~- Q5 G3 p& {1 @3 i' x& {7 k– parts with a mass of combustible material of less than 4 g;
: f c: e4 e) H! [– supplies, consumable materials, media and recording materials;9 q" y9 q- l/ v
– parts that are required to have particular properties in order to perform intended functions,
- v) E1 k/ S: j asuch as synthetic rubber rollers, ink tubes and material requiring optical characteristics;/ G" O/ D9 k6 P L) r) u8 V& U
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。0 t1 {) w2 G; t- ?. l/ `; p
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发表于 2021-11-29 14:24
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