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22.21 Wood, cotton, silk, ordinary paper and similar fibrous or hygroscopic material shall not0 g+ a' ~. U c
be used as insulation, unless impregnated. This requirement does not apply to magnesium
4 f# S5 h) b+ Z1 g( woxide and mineral ceramic fibres used for the electrical insulation of heating elements.$ T0 }# G9 a3 [2 F' G& H! K+ H, _
NOTE Insulating material is considered to be impregnated if the interstices between the fibres of the material are
/ }- L# I/ O8 c5 Y6 W i- Bsubstantially filled with a suitable insulant.- u( o; S# B+ z$ c+ G/ d
Compliance is checked by inspection.
% l. [3 \8 @2 a1 E3 u, W c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?: w2 k, j, r' `9 n. N3 ~
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