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22.21 Wood, cotton, silk, ordinary paper and similar fibrous or hygroscopic material shall not, y% \# r% U1 a3 C/ Q, q
be used as insulation, unless impregnated. This requirement does not apply to magnesium# Y: \4 k3 V1 s) R
oxide and mineral ceramic fibres used for the electrical insulation of heating elements.
0 j# `2 f, z; F; k1 q" BNOTE Insulating material is considered to be impregnated if the interstices between the fibres of the material are p% B4 G, q. _# ]* n7 n( X& M8 X# M
substantially filled with a suitable insulant.
4 o4 P2 e; ~4 ], P8 PCompliance is checked by inspection.
! k9 ]' K- H: _* |7 u' @& ]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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