DSH 385 Flammability of materials and components

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广东安规检测
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DSH 385 : S3 `$ _8 O1 W : D, N4 y  P- n4 G* Y; i

Flammability of materials and components

4.4.3

60950(ed.2) 9 s' [7 y7 G7 ~3 X. g

Standard:
) K, u2 w) _9 s, j' `- dIEC60950, 2nd Edition
Sub clause:
4.4.3
  o6 r/ I. A/ RSheet n. 385
Page 1 (1)
Subject:
Flammability of materials and
components
' W3 a/ g  {* z  E( I/ I. D) s9 G! RKey words:
-Fire enclosure
-Flammability
: J" d: Q5 }" MDecision confirmed
0 o% M, b# }. R9 [2 V3 V; K, k5 @at CTL 38th meeting
Question:
0 q0 D7 f6 E/ j+ AIt 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
7 K+ |9 w# O6 V: }inside 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
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.
0 }& {" G0 |6 k& b