Flammability of materials and components , n; y! Y/ z2 i1 k& I+ {5 o
4.4.3 X* G! H# N& `) X0 S3 ]" \
60950(ed.2)8 [# N- ]$ r! q( _, D n* e
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Standard: + f" O+ r5 j+ Y w- ]- {8 QIEC60950, 2nd Edition $ g4 b8 g, V6 \2 ^Sub clause: / K, X" O% z5 s1 u+ y% ?4.4.3 " v; r& e( X# G7 CSheet n. 385 : m7 q2 Q+ C9 X, X0 _) MPage 1 (1) ! y7 M+ u0 \& Q: n4 t9 SSubject: / ?( `* U) j9 m3 s- y JFlammability of materials and J+ H; a- \' r( S6 M
components# k. m+ h( A, {3 P
Key words:% Q( b0 s) n9 E, W
-Fire enclosure 3 }) k/ q0 w3 Q-Flammability 2 ~2 A3 \" t$ B( w5 DDecision confirmed/ m' \& | T2 k) i- p
at CTL 38th meeting! A9 {5 M- ], N5 ^, X8 [* o/ H# T
Question: Z! O1 [3 G* O' {2 s; r
It is allowed to add decorative parts with flammability class HB to the outside of the fire 1 n- q& @8 K+ h3 z. U" penclosure of, for example, a computer. Consider the situation that the computer is, then, + e) n8 g0 ~7 N* S3 A+ I/ Uinstalled inside the fire enclosure of bigger equipment. According to the standard, parts 8 ^ W# P; s a7 h) Q' Finside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2+ _6 I7 X, ~* X4 Q0 J9 o
and 4.4.3.3: all materials inside a fire enclosure must be of flammability class min V-2 or ( n- M! y1 i! e/ S& |' S/ }1 G. THF-2. It is not clear whether the decorative HB material on the outside of the computer is ) H6 O2 W6 A/ ~% b& Y5 wexempted from this requirement since the computer has been approved separately/ w6 b k' H7 j: w/ _6 g/ }" g
Decision:3 @+ Z: g3 M2 b; ` z' T, Z
HB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed. $ u( t7 A" [0 P9 U . t" y1 d1 d1 E[attach]77174[/attach] ; t# x$ `) O5 c
DSH 385