Answer Posted / william lobo.

In case of laying of single core cables then trefoil
formation should be adopted. i.e. R Y and B phases should
be clamped with alluminium clamp only or Stainless steel
clamp to avoid induction.

Derating factors are also to be considered which depends on
the distance of cable laid from each other. If cables are
touching one another incase of multicore cables then
derating factor will be about 0.5 to 0.6 or so.

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