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|  DSH 385
6 {+ j7 O7 T$ ^. d
2 M% `: B; t! w0 k) r. U$ o# b- I: G4 l; j# t
| Flammability of materials and components
& Q5 W7 _! ?/ O0 `/ V | 4.4.3
" T$ n9 Z& i/ K/ \8 k- x$ v | 60950(ed.2)) f/ u% g. w- a2 M9 G* b4 J4 u
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4 c4 e1 N9 z% K! Z) hStandard:
+ d5 X l: J# D- X1 u3 @# [IEC60950, 2nd Edition! H* [# d& J* E3 i
Sub clause:8 U J) M3 A2 Y+ I/ e! M8 L7 G
4.4.35 ^! B, F5 r) h+ b
Sheet n. 3858 d3 H7 n) U: ]
Page 1 (1)4 D ?# b' U! ]0 j1 [6 o) W8 D$ }
Subject:* U4 A" t$ k) F% l- [
Flammability of materials and
+ i' }" ]+ s* `7 a; n% jcomponents
7 p p( c O: R4 i2 D2 Q9 J# j0 t3 LKey words:
/ Y$ d& X* g, k/ ]6 b! z-Fire enclosure
5 T9 b5 G; \5 n, k8 y3 K# C) H* @-Flammability
+ U: V# o1 F- T$ j: oDecision confirmed
" z' l% A! r, F* jat CTL 38th meeting) [! C4 d; |7 s F4 p$ x
Question:* K) i6 y0 _0 q8 G1 _- i* K
It is allowed to add decorative parts with flammability class HB to the outside of the fire
" ^' O2 V6 h# `5 b$ cenclosure of, for example, a computer. Consider the situation that the computer is, then,
0 J+ p0 a- Y/ \installed inside the fire enclosure of bigger equipment. According to the standard, parts
- B" c5 l$ ?8 U/ J3 pinside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2% X! w/ Y6 _/ g
and 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or; u3 V) d$ N+ f7 X8 Y2 @6 v
HF-2. It is not clear whether the decorative HB material on the outside of the computer is
, N* @7 w: S( Oexempted from this requirement since the computer has been approved separately
/ g# @" ~9 D+ z. A& a& sDecision:
) m7 X3 H$ U/ n. QHB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.
1 B1 P0 i8 }; d2 s8 A( V2 h9 i3 u, Z. z5 R% m- H
1 ]! d& S9 K( l9 n6 L' X4 [
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发表于 2012-11-6 17:25
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