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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- u6 s" m8 ?3 Z+ x! U8 t' A
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Flammability of materials and components
6 U% e8 t" j* @+ O# D		4.4.3
; y! r. n& ]' q' I: G; k  [+ f		60950(ed.2)0 k) d* B4 {+ \. N/ P: c$ f9 Z
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Standard:
2 M) Q. l& H! K2 vIEC60950, 2nd Edition
6 n3 i7 U) m4 x2 z: _9 V0 tSub clause:8 K, M+ A5 j5 R
4.4.3
- k0 N( L' Z+ v( ^! o( `Sheet n. 385
% [5 J/ L6 M) x" H" k5 L" kPage 1 (1)9 b2 T8 [9 z# v1 g: A! O" o
Subject:
- X' f5 `9 I/ y. WFlammability of materials and0 M5 |  Z, V6 R& C* K9 O3 A, u7 M- t
components& R: u' I0 b, m. Q+ g
Key words:
6 {* M3 N. s# O  G& K; `$ Z-Fire enclosure
7 ?& F! z& N! g! J! Q# D-Flammability/ ~- T) k* b' q# `+ V3 N6 J
Decision confirmed. X6 w, C& {5 f3 h- U0 v/ g
at CTL 38th meeting
) n7 q/ Y+ V$ t; Z! p! N" yQuestion:& {% [' g$ Z2 s) r+ ^9 u
It is allowed to add decorative parts with flammability class HB to the outside of the fire5 j/ E! ^8 U+ g8 }4 o9 b4 Q0 j
enclosure of, for example, a computer. Consider the situation that the computer is, then,- U& k0 a2 d& R8 b
installed inside the fire enclosure of bigger equipment. According to the standard, parts+ {1 f  Y0 r; ]* V+ `
inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
+ Y3 X, j, }" k; B3 e) ~and 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or
6 J5 f/ c! |6 N6 y1 X/ oHF-2. It is not clear whether the decorative HB material on the outside of the computer is  c0 h. N& x) Y
exempted from this requirement since the computer has been approved separately
9 I% S3 ?: \" c% h- dDecision:  t2 m8 U1 u# }/ ?) l' e' l
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.
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