DSH 385 Flammability of materials and components

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DSH 385 " e+ t  W% U2 E9 t: k

Flammability of materials and components

4.4.3

60950(ed.2)

/ K6 H+ y# q. j( _% UStandard:
  k7 r- t4 s5 C3 j0 N) iIEC60950, 2nd Edition
Sub clause:
; j/ l" L6 S3 \- X. M, V4.4.3
) e% n2 N& A. N, k" USheet n. 385
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Subject:
$ j: v+ `* E3 CFlammability of materials and
components
1 e/ ?) Q/ T: ~. EKey words:
* z/ ]/ |3 e" G/ s: B% b-Fire enclosure
-Flammability
Decision confirmed
2 j* d+ o( u- o+ Q/ `9 Bat CTL 38th meeting
Question:
" g! e9 }8 L2 ^' v: @# A& RIt 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
. r. f1 U1 Y2 R& B# g0 L* Yinside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
0 i/ ]# [: J; ^8 U: Y( N+ |9 Mand 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or
0 {2 U4 y1 j' s# }HF-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.

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