Dear All,
    FR power cable we will produce according to  BS 7846 & BS 6387.
1)which BS standard we should follow to produce Single core FR Cable.
2)what are the tests we should carryout for FR single core cable?
3)Which XL-LSZH compound should be use as a secondary insulation EI5 (or) EI8?
4)what is the Benefit for using mica tape? 

Mica tape is an inorganic high dielectric tape manufactured with mica paper and laminated to various reinforcing substrates to enable ease of handling. Tapes are available in fully cured, VPI, resin rich (press cure) and B stage.
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1,2 . you can use all standard for cable but you have to chose fire resistant standards.

IEC 60331-1
IEC 60331-2
IEC 60331-21
EN 50200
ETC...

3. For mantel EM8 , insulation is EI8 regarding en norms.

4. in my opinion silicon is useful than mica but mica is cheap