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|  DSH 385! {7 m) Y) J8 v& X; F( b) \; X) I
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| Flammability of materials and components6 t1 ~5 l4 S: T: x9 q. M
| 4.4.3
% m* S% ~ E. N- p | 60950(ed.2)
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Standard:
4 C: B/ l& c4 v P2 q; S2 J. yIEC60950, 2nd Edition" v5 N2 V) Y: f" w) F" K
Sub clause:
( b) q4 S0 e3 a8 h. e! I4.4.34 K+ K; t2 e7 g0 U6 y/ ]$ i' H
Sheet n. 385
/ N( J5 E% i0 [, U7 |Page 1 (1)- {$ R0 R# E, \: a$ C0 A
Subject:% R) F+ q2 f0 _1 _
Flammability of materials and) W) Z5 z) s" Q' o5 C* Q x7 J) u0 U# @
components. ]0 O5 u" q' Q( A
Key words:
( P& A o P: j-Fire enclosure, I. y. r! ~2 ^% y( M3 B
-Flammability
, `( A M( o4 e1 o( s; _Decision confirmed
5 ]5 P/ a% N2 @* z0 j; @1 Cat CTL 38th meeting. n7 w, `% S/ j& K, l
Question:) @. I% m. Y% M6 M
It is allowed to add decorative parts with flammability class HB to the outside of the fire" t4 m0 e' i! U- S+ D- z1 }
enclosure of, for example, a computer. Consider the situation that the computer is, then,4 K/ {4 n1 H" Q5 j
installed inside the fire enclosure of bigger equipment. According to the standard, parts
c/ A7 u9 n/ f, z' }: v: minside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
+ H4 w( {) B5 yand 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or
t$ B$ T& V/ X9 `1 aHF-2. It is not clear whether the decorative HB material on the outside of the computer is
b( r; _ h1 t2 f vexempted from this requirement since the computer has been approved separately. @* Q) b& f* E8 a- S8 G& i3 ?% D
Decision:# q2 s% P5 z9 t. v
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.* d( \4 |, w! W9 L0 k6 y8 v
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发表于 2012-11-6 17:25
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