DSH 385 Flammability of materials and components

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DSH 385 ' r0 }) b( x3 M& S3 i ; s8 @* N/ L3 [% `

Flammability of materials and components " C( e1 S: ~% u: x

4.4.3 & r+ ^$ E7 ^% N" _1 S& O

60950(ed.2) * _0 a- [& i- o/ s$ q& E, O

Standard:
" r: Y" o. u! d( A) F, n5 rIEC60950, 2nd Edition
Sub clause:
4.4.3
Sheet n. 385
# K) n% b5 h& F( p/ W; N5 IPage 1 (1)
Subject:
7 n" y: u8 H) X* V+ x7 O% `/ Q; G' l' H1 {Flammability of materials and
components
4 d2 G/ D  x8 a# w9 oKey words:
-Fire enclosure
( R: m7 k; N( i& j& c, |0 g0 C-Flammability
8 ^/ p* W6 Q. T* F6 P+ vDecision confirmed
6 i+ [6 a5 q% x3 pat CTL 38th meeting
Question:
It is allowed to add decorative parts with flammability class HB to the outside of the fire
* }9 I5 n( b2 _enclosure of, for example, a computer. Consider the situation that the computer is, then,
5 y& Z2 }' l7 E$ ]" p: X1 f; iinstalled inside the fire enclosure of bigger equipment. According to the standard, parts
inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
% y: H( A) {1 H+ D# ^and 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or
HF-2. It is not clear whether the decorative HB material on the outside of the computer is
. G5 Z! A4 F8 Y8 b! mexempted from this requirement since the computer has been approved separately
* n( S  b: o8 q' R6 B4 g" YDecision:
! `% N. a1 R% Y8 j! L2 NHB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.
+ O) U' o  h, i$ }: L