DSH 385 Flammability of materials and components

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广东安规检测
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DSH 385 " W9 N- I* o3 O3 p, s 9 @" a. f) X3 s$ Y

Flammability of materials and components

4.4.3 5 b6 G8 h/ s; G, l6 s( k

60950(ed.2)

8 L* J8 `) \2 a+ O, WStandard:
$ G( K( q* ]- }. J  G: yIEC60950, 2nd Edition
& G0 C1 ~# T8 y9 t  YSub clause:
" e9 G' z4 F% q2 E. T# [) U4.4.3
: \1 O* I/ e! C; G1 S( Q  f" v, }( wSheet n. 385
4 D# S! P5 Z: E" xPage 1 (1)
Subject:
Flammability of materials and
components
. m& ]; q  Y1 C! n# KKey words:
- B9 X1 l# b6 B3 m7 w-Fire enclosure
, L: j) s, S! C* ~; x. B-Flammability
Decision confirmed
; ]4 |1 x0 b& Q" H) [, ?+ _at CTL 38th meeting
Question:
7 D# t2 t$ O0 b& f; Z9 P4 B! [4 JIt is allowed to add decorative parts with flammability class HB to the outside of the fire
( d; n9 f* C0 ~9 e# zenclosure of, for example, a computer. Consider the situation that the computer is, then,
) D( f/ c1 N/ A& h2 rinstalled 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
' y5 |: `) F3 R  X5 n" uand 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
6 J' h: L; u# K* U$ Sexempted from this requirement since the computer has been approved separately
Decision:
: K$ P, \9 o' M! O7 IHB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.


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