DSH 385 Flammability of materials and components

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广东安规检测
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DSH 385 ! H6 {: V. q* u; M1 I& R 7 `! w- z: V, M& ?& v% I% T 7 ]! r; L6 x# U0 `$ o" n3 U% s

Flammability of materials and components

4.4.3   {/ L4 W$ N2 B

60950(ed.2) * z& _/ I: v' v9 k$ h* u

6 w9 W* o4 K& U, W' }Standard:
IEC60950, 2nd Edition
! D+ H- h7 ^- B1 u6 t  K. KSub clause:
# n+ z! l: e; u; y7 j4.4.3
Sheet n. 385
Page 1 (1)
% }. i4 z+ B, V7 E5 H. tSubject:
0 e+ S- c1 u% O% B* kFlammability of materials and
components
Key words:
-Fire enclosure
5 W" |5 Y; {- j, x6 v-Flammability
Decision confirmed
* q, ~  B! S7 N5 t4 J' ]at CTL 38th meeting
Question:
, f, W" Q4 M4 o* {' c; wIt is allowed to add decorative parts with flammability class HB to the outside of the fire
- b4 G) g  ?5 w- @& X( cenclosure of, for example, a computer. Consider the situation that the computer is, then,
+ X, i0 v5 n' c9 ]2 @& ainstalled 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
' E1 u$ x- G" Yand 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or
  q8 b( \- s+ z( s( q* p& w9 JHF-2. It is not clear whether the decorative HB material on the outside of the computer is
, p% S" `; c) O! ^4 \( K: w$ f% Dexempted from this requirement since the computer has been approved separately
" F* H% ]0 s" A7 `  P: f" ?Decision:
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.
( t% y) t: X9 ?