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|  DSH 385) ?& ^, n' g% b" [
i" B( B3 c9 V+ w
: @) r2 U8 H. q3 v$ Y
| Flammability of materials and components
% C, Q3 h; z+ D. d2 s* @0 Z7 q0 v | 4.4.36 O* q' h g! I; E
| 60950(ed.2)
% g1 |4 t; Z) J |
1 E; M6 i2 X! S- _0 t/ c' OStandard:( B' U. F5 p- u; r0 T! G0 s
IEC60950, 2nd Edition
* C& ]" J2 M4 e+ v9 R; Q8 PSub clause:# o1 n3 D- z( k- L) _) p. a, D2 ]" V u
4.4.3
" G% J3 }4 f& j" E! P: hSheet n. 385$ ~; w$ V: T* U, `/ q
Page 1 (1)
8 R. o p6 w- jSubject:- w1 D8 u( R4 ]. _
Flammability of materials and
7 r" V4 N; A4 @5 {, H9 S. P+ Z$ r0 Fcomponents
4 T* S% ]7 L3 E1 q6 U- KKey words:" l- n' w4 I# c: O& u( [
-Fire enclosure
; {% I! s3 I5 K: U1 K1 |-Flammability
3 L' i; L+ ~5 ~" ~; g6 ^4 eDecision confirmed9 g/ u7 u! Y9 J1 Z0 a
at CTL 38th meeting4 c0 D* V. D( ~+ ?' N, N
Question:
( D1 D' O& c% Q- @0 oIt is allowed to add decorative parts with flammability class HB to the outside of the fire( v( D- Z T- n4 \
enclosure of, for example, a computer. Consider the situation that the computer is, then,
8 P8 j3 t) V( B6 dinstalled inside the fire enclosure of bigger equipment. According to the standard, parts: { C5 o8 L) s: Z& M5 O
inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
! G* t# M. E1 K8 G0 U U& l3 vand 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or9 [2 Q7 Q" q0 F) J( ^
HF-2. It is not clear whether the decorative HB material on the outside of the computer is" |/ U; ]3 z8 ]
exempted from this requirement since the computer has been approved separately
2 c o. M/ ^6 v5 t4 F8 S- ^) ~Decision:( g% \% p' Y9 v3 L! g
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.
3 B/ w9 ^/ C3 N' ?6 C( [# q
( g. E: ?. z. S3 h! R) s$ h6 b* }+ P6 q0 y: d; f- @
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发表于 2012-11-6 17:25
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