DSH 385 Flammability of materials and components

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DSH 385 8 R$ f( a& C) b3 o/ o

Flammability of materials and components ( f% C- S: X; v3 Z$ a

4.4.3 5 I+ l- |: T% P9 V$ H. {# \

60950(ed.2) % q6 Z2 A. s* y  H# f- A  w

8 c4 M' z& b( r" b) b* {. dStandard:
IEC60950, 2nd Edition
& u3 J" T( o, P5 N8 Y  X: nSub clause:
4.4.3
Sheet n. 385
Page 1 (1)
Subject:
Flammability of materials and
* n3 G7 p( [# g* B* R# Tcomponents
. w. F- E/ b6 L# x6 {Key words:
: L9 I  r% o" X2 m. E: ?) W- b* `-Fire enclosure
-Flammability
' v4 r& u9 v2 F* E: BDecision confirmed
at CTL 38th meeting
Question:
5 ?  e1 O* h; N9 t4 P! TIt is allowed to add decorative parts with flammability class HB to the outside of the fire
! K$ P  v( w' F" m3 `enclosure of, for example, a computer. Consider the situation that the computer is, then,
installed inside the fire enclosure of bigger equipment. According to the standard, parts
7 `1 G* U; M- N; }% _# _inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
: K0 e$ R6 N2 @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
" m; Y& O' \8 F- @! M: K) K: texempted from this requirement since the computer has been approved separately
+ d+ E& F2 Y" J9 |Decision:
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.

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