DSH 385 Flammability of materials and components

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广东安规检测
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小型摆管淋雨试验机

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1000L恒温恒湿箱

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水平垂直燃烧机

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GB1002插头量规

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灯具防风罩

IK冲击试验机

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家电温升测试角

针焰试验机现货

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家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 385 ! S6 e: c2 B& l8 W  K8 A - ~1 F: |6 }$ |  X

Flammability of materials and components

4.4.3

60950(ed.2)

6 D% Z* K7 j, D4 g5 Q: Z& ]Standard:
IEC60950, 2nd Edition
) X0 {( `1 A+ \Sub clause:
4.4.3
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Page 1 (1)
* f8 L8 L9 o0 g  A1 C  _+ ]" K* HSubject:
Flammability of materials and
2 X' O  n7 M% F* o4 Y9 K  _components
4 j. G% }  ?1 z3 {# [5 x3 O. v/ nKey words:
-Fire enclosure
-Flammability
% y7 p7 o! d6 P% |9 P/ Z2 q1 t$ jDecision confirmed
at CTL 38th meeting
7 S+ k5 J% T2 I, zQuestion:
' n: L* [) A* f. eIt 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,
1 z/ x- [* j! \6 P$ iinstalled inside the fire enclosure of bigger equipment. According to the standard, parts
) j! k# y" R, _" \+ ~1 [; [inside a fire enclosure of the bigger equipment must meet the requirements of clauses 4.4.3.2
$ ]' F# I3 k% ?! Y6 ~! J, Iand 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:
+ z" |  W+ n3 F( k' P8 iHB material inside a fire enclosure is not allowed, reference clause 4.7.3.4 in the 3rd ed.


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