CABLE SIZE FOR TRANSFORMER SECONDARY

RECOMMENDED SIZE OF CABLES FOR THE SECONDARY SIDE OF TRANSFORMER
Capacity of Transformer         kVA	Secondary current      Amps	Minimum size of neutral earthing conductor          (mm)	Minimum size of PVCAPVC cable            (mm)
63	84	25 x 3	50
100	133.3	25 x 3	95 (2 x 50)
160	213.3	25 x 3	185 (2 x 95)
200	266.6	25 x 3	300 (2 x 120)
250	333	25 x 3	(2 x 185)
315	420	31x3/25x4	(2x300) or (3x135)
400	533	38 x 3	(3x300) or (2x400)
500	666.5	25 x 3	(3x400) or (4x240)
630	840	31 x 6	(4 x 400)
750	1000	50 x 4	Busbar trunking