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If the following materials and parts are not separated from a PIS according to the4 ]6 N' B% x8 g2 e9 j
requirements of 6.4.7, then the materials and parts shall not ignite during single fault) i+ e; i+ }) u3 m
conditions as specified in 6.4.3.2:
& h! _2 R8 w7 Q2 r5 e& X- ^1 W– supplies, consumable materials, media and recording materials; and; F9 H* H/ `- e7 K
– parts that are required to have particular properties in order to perform intended functions,; T# m' ~2 i& s9 F/ ^: J
such as synthetic rubber rollers, ink tubes and material requiring optical characteristics, {7 f Z+ { s6 b' {( H0 n
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2 a* g2 o8 { |) I3 [8 E- F$ ~
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– by providing a fire enclosure as specified in 6.4.8.
: L$ u7 I- @8 \# d$ z( `. uWithin the fire enclosure, combustible materials that do not comply with the flammability
8 u. {$ b- A$ D" W# hrequirements for PS2 or PS3 circuits shall comply with the flammability test of Clause S.1 or( t$ p/ |3 H0 z5 G- b# H9 K
be made of V-2 class material, VTM-2 class material or HF-2 class foamed material.
" E) B* u# j. z6 }These requirements do not apply to:
" r+ Y1 c3 h) N. [) g; R8 ~– parts with a volume of less than 1 750 mm3;
K+ H m2 c5 ^ E, r– parts with a mass of combustible material of less than 4 g;
8 p; d2 F0 J V5 J# @2 A– supplies, consumable materials, media and recording materials;
3 h0 D- }* v6 O– parts that are required to have particular properties in order to perform intended functions,, ^5 v; `- B8 C1 X/ A4 Z
such as synthetic rubber rollers, ink tubes and material requiring optical characteristics;4 q! U" U" F# o3 o- \# a0 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。0 t! X; p, T1 y% e+ O, A+ F
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发表于 2021-11-29 14:24
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