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22.21 Wood, cotton, silk, ordinary paper and similar fibrous or hygroscopic material shall not' P1 j4 K$ o2 ^/ \
be used as insulation, unless impregnated. This requirement does not apply to magnesium
4 O; z2 M; i* y) ?oxide and mineral ceramic fibres used for the electrical insulation of heating elements.' ^4 {, p2 W3 a$ q# ~4 f
NOTE Insulating material is considered to be impregnated if the interstices between the fibres of the material are" P: p: L, s5 l# L# t' S& J
substantially filled with a suitable insulant.5 }' z0 b) K& x% a4 c1 s
Compliance is checked by inspection.. l+ Y; g( E' m: H
哪位大侠能帮忙确定下,氧化镁到底能不能作为发热管的固体绝缘呢?
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