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|  DSH 610
; g$ T; v& M" L6 D7 Q9 R9 f: ?* [4 g! Q
| Construction+ l5 z. a" B+ q, Z! B, H: K
| 22.21 and 22.32
` f3 @ ?) w0 j | 60335-1(ed.4)
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Question:, ^& ]+ ?* `) M4 o2 `; ]$ {
A oil filled room heater of Class II has a heating element in class II construction. This construction consists of two layers of independent insulation of magnesium oxide which will be used as basic and supplementary insulation. According to note 2 of clause 22.21 magnesium oxide will be not considered as hygroscopic material. The magnesium oxide is tightly sintered and in line with the tests of sub-clause 22.32 . The end of the heating element (side of the connectors) is protected by a sealing against moisture.
0 E+ z1 w; D0 t6 p7 e- F2 @. `& oIs this construction acceptable because in line with sub-clauses. 22.21 and 22.32?
5 y1 _0 m' m' N5 W( k' gDecision: c0 _% x1 F! I9 ~; _. O! r
Yes, the construction proposed is acceptable because in line with the standard.
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发表于 2012-9-8 18:09
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