[c) interconnection between bus bar and switchgears /cable shall be rigidly supported and made out by flexible copper wires (up to 63 amp ) and by solid bus bar (>63 amp ) . control wiring will be carried out with 1.5 sq.mm, earth wire with 2.5 sq.mm and ct with 2.5 sq.mm flexible copper wire only. all joints / interconnections of copper bus bar shall be dully tinned . clearance between main bus bar and risers / metal parts shall be at least 10 mm additional to width of bus bar bus bar is insulated by heat shrinkable sleeves . earth and neutral bus bar shall be half of the size of phase bus bar. ( cost of bus bar / flexible wire for interconnection between main busbar and switchgear is to be paid extra )
