|
If the following materials and parts are not separated from a PIS according to the
- K" a& e# v" a& N' ~7 k$ Trequirements of 6.4.7, then the materials and parts shall not ignite during single fault
$ D, j9 y" e H. u& sconditions as specified in 6.4.3.2:* k7 h1 q' { P2 d: S0 X
– supplies, consumable materials, media and recording materials; and6 h. s% p4 ?& z6 b3 \
– parts that are required to have particular properties in order to perform intended functions,
t9 t, {) _& K8 y) b. Vsuch as synthetic rubber rollers, ink tubes and material requiring optical characteristics
0 o) f. d& V- V# pPS2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; \( T, b! j( g8 S4 z
% C7 R* G- g" ~+ n' ]# C4 c: N
– by providing a fire enclosure as specified in 6.4.8.' w7 V/ S( `4 O9 i8 l- k
Within the fire enclosure, combustible materials that do not comply with the flammability4 }0 K- F9 M( {* Z/ T, P
requirements for PS2 or PS3 circuits shall comply with the flammability test of Clause S.1 or
, ]0 t. s7 [+ E" x$ `, D }7 L$ ~be made of V-2 class material, VTM-2 class material or HF-2 class foamed material.+ n% Y6 \( H( k9 n+ }% o. t s
These requirements do not apply to:' D2 z% Y3 E/ J8 }" y
– parts with a volume of less than 1 750 mm3;
/ W* C6 d! M3 @) {% G– parts with a mass of combustible material of less than 4 g;/ w+ s* k8 p, v4 Z& j( N
– supplies, consumable materials, media and recording materials;5 [$ a5 q5 ]( _: y
– parts that are required to have particular properties in order to perform intended functions,0 [) E1 d8 b) c0 f( Y
such as synthetic rubber rollers, ink tubes and material requiring optical characteristics;$ g$ G. }# f$ m4 C8 i$ d% 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。. r$ k- B+ g9 R4 ^
, q8 w2 _2 W+ Z$ K( W F
* M. i9 ^$ K2 `( ~
|
|