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22.21 Wood, cotton, silk, ordinary paper and similar fibrous or hygroscopic material shall not
6 P! [& r3 z' `3 E) ?; _$ h4 t6 Lbe used as insulation, unless impregnated. This requirement does not apply to magnesium
- E# v. P8 K. \5 ?+ N0 {; D$ eoxide and mineral ceramic fibres used for the electrical insulation of heating elements.
5 W( O( `# A9 |4 @3 SNOTE Insulating material is considered to be impregnated if the interstices between the fibres of the material are, s1 i/ E0 @( c0 M m/ P
substantially filled with a suitable insulant.3 V/ \2 w$ W8 [; l) F
Compliance is checked by inspection." \7 b5 J) H- |1 a
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?* R" S/ }0 a* ~% ?. ]" X+ M
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