DSH 385 Flammability of materials and components

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DSH 385 1 `8 D6 x3 H& }2 e( Q) d: Q

Flammability of materials and components

4.4.3

60950(ed.2) : F$ L; E+ O' Q6 e! H) n8 m

, j3 }; X5 b7 @: r. y( ^; PStandard:
' z; _7 C, s/ {& [- O: lIEC60950, 2nd Edition
Sub clause:
4.4.3
. }- O% ?/ @/ x# z7 R0 xSheet n. 385
/ @3 v3 Z; v+ ~# n7 Z  u& KPage 1 (1)
/ n% N) \2 o) }) M9 lSubject:
2 i& V* `: b5 hFlammability of materials and
" Z: y2 {( L3 Y2 d' _7 f# wcomponents
Key words:
-Fire enclosure
) ]' u1 b: m! b) q* R-Flammability
Decision confirmed
/ W  b* h% G/ b$ M8 B: Dat CTL 38th meeting
* ^/ Y8 x- E0 Z* l# I- k7 jQuestion:
9 X8 j+ F3 L5 O9 D) JIt 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,
. a0 E; L: {3 l8 Qinstalled inside the fire enclosure of bigger equipment. According to the standard, parts
/ T" b1 U# w2 j+ Y' Q% linside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
and 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or
; H! k; @0 ~. CHF-2. It is not clear whether the decorative HB material on the outside of the computer is
exempted from this requirement since the computer has been approved separately
Decision:
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.