Transformer Neutral Point Earthing

Transformer Rating	Copper Conductor ( Bare)	Single Core Aluminium	GI Strips
50 KVA and below	8SWG	16sq.mm.	1"1/8" (25x3mm)
75KVA	6SWG	25sq.mm.	1 1/2" 1/4" (40x6mm)
100KVA	4SWG	35sq.mm.	1 1/2x1/4" (40x6mm)
150KVA	25X1.5mm	70sq.mm.	1 1/2"x 1/4" (40x6mm)
200KVA	25X3mm	95sq.mm.	1 1/2"x 1/4" (40x6mm)
250KVA	25x3mm	150sq.mm.	1 1/2" x 1/4" (40x6mm)
300KVA	25x3mm	225sq.mm.	1 1/2"x 1/4" (40x6mm)
500KVA	25x6mm	300sq.mm.	2"1/4"(40x6mm)
750KVA	40x6mm	2x225sq.mm. OR 1 x 500sq.mm.
800KVA	40x6mm
1000KVA	50x6mm
1250KVA	60x6mm
1600KVA	80x6mm
2000KVA	60x10mm
2500KVA	75x10mm