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|  DSH 6100 _- l8 T1 @; H: ?6 v! r
3 A b" e. `" B* { ]: p) v; X& k | Construction
+ a! S5 Q. X) O0 N7 B | 22.21 and 22.32, }+ C5 V( n2 O
| 60335-1(ed.4) l: c. `0 o7 n8 C5 @: ~* B
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% L( B# w# {/ |5 M' ^) g8 D, rQuestion:
+ s6 i& V, Z( eA 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.
( D9 u8 X7 m" q- i$ B# ZIs this construction acceptable because in line with sub-clauses. 22.21 and 22.32?
[# H6 B4 ` M: `Decision:, U' Z4 f$ Y5 H+ ?
Yes, the construction proposed is acceptable because in line with the standard.. z! s3 E' u r: z3 ~' t
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发表于 2012-9-8 18:09
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