DSH 385 Flammability of materials and components

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DSH 385 1 U, `& Q8 T7 k

Flammability of materials and components

4.4.3   o+ [# k; K2 Z* }' {# v

60950(ed.2) 6 Z& u$ S; `3 e8 E* @! D* O

Standard:
IEC60950, 2nd Edition
Sub clause:
0 K: }$ P. Y, p5 K/ J& c4.4.3
. |. v, M4 ]) r, e& U3 ISheet n. 385
Page 1 (1)
+ i* O% g+ W' e* SSubject:
Flammability of materials and
! y+ D& Z: O: Xcomponents
7 Z4 |9 @  u7 Z# |Key words:
-Fire enclosure
7 F. l% q3 B4 g/ A" W; ]-Flammability
, j6 j+ a. R, w+ y3 ?% W% F/ O1 |' A' }Decision confirmed
at CTL 38th meeting
Question:
It is allowed to add decorative parts with flammability class HB to the outside of the fire
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
& K- {9 M+ |( {# }inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
6 y/ B* e  z/ y/ j* `* @. land 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
5 a1 m, D) p: D, a, k; nexempted from this requirement since the computer has been approved separately
Decision:
# C4 `2 U$ J/ B- ^8 v9 c8 f+ gHB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.

4 H* ~# _: x& e+ D