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|  DSH 610
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| Construction- B; {. p1 k# y$ x' T) c! B
| 22.21 and 22.32
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Question: x4 g, s7 _, [! M3 ]6 h$ R$ l4 Q4 W
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./ J2 B& L7 A! a% t. I
Is this construction acceptable because in line with sub-clauses. 22.21 and 22.32?$ [2 S" I. u# q% ~
Decision:# a( h5 b/ P T1 F3 p
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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