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22.21 Wood, cotton, silk, ordinary paper and similar fibrous or hygroscopic material shall not
V- q: s0 A8 N5 Lbe used as insulation, unless impregnated. This requirement does not apply to magnesium$ m5 e; u4 e* r! B* F1 e
oxide and mineral ceramic fibres used for the electrical insulation of heating elements.
' s4 C r; d4 B3 D4 {& ^, j. ~NOTE Insulating material is considered to be impregnated if the interstices between the fibres of the material are
8 X9 R0 p. r0 A1 ksubstantially filled with a suitable insulant.
: k3 X0 A9 O, `6 T; NCompliance is checked by inspection.; Z5 {, U6 B t* j. h$ K* `7 n
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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