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标题: DSH 385 Flammability of materials and components [打印本页]
作者: 小米    时间: 2012-11-6 17:25
标题: DSH 385 Flammability of materials and components
DSH 385
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Flammability of materials and components
! D! k3 f) J+ w5 ~" M		4.4.3* m: `( f' g- z2 L5 q& c* L+ T
60950(ed.2)
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: a9 h) h/ J4 m6 i$ SStandard:
+ o( @) V3 n) A; U& [IEC60950, 2nd Edition
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: {1 d/ y# Q7 d# q0 a4.4.3
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Page 1 (1)
) a3 F( ^* b. F( \0 Q, lSubject:. C( s2 n8 `  `7 H0 r/ {. W: a
Flammability of materials and
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Key words:
  j) C6 I2 {  Q1 t6 o& h-Fire enclosure
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Decision confirmed7 o4 y* b& {+ i# V! w9 X3 Y4 z: K9 B
at CTL 38th meeting
7 v; U& ?& ~& {& ?Question:+ B; [  J$ `8 ?5 {0 h
It is allowed to add decorative parts with flammability class HB to the outside of the fire
2 d+ p: F8 R8 _. w2 i; nenclosure of, for example, a computer. Consider the situation that the computer is, then,1 ], T+ k! ^4 g) \" x( r6 D
installed inside the fire enclosure of bigger equipment. According to the standard, parts) P: j$ ~  V. s7 E. @3 j
inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
% ~* A/ `! y' q( x/ u  Eand 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or0 U% t% X( e/ d+ T! c& z
HF-2. It is not clear whether the decorative HB material on the outside of the computer is
! ^8 Z/ ?( L1 O- k* Gexempted from this requirement since the computer has been approved separately; h1 ]7 O0 K/ J! n% ~6 |& G8 V
Decision:
2 ^% z. o7 q1 sHB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.; ?; `% Q9 t) ?7 I

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