21
TYPICAL CABLE SIZES FOR DG SETS (Ref. M.7)
kVA Rating Amp Rating Cable size sq. mm. X runs
2000 2782 500 x 10 — —
1800 2504 400 x 10 — —
1500 2087 400 x 8 300 x 9 240 x 10
1250 1739 400 x 7 300 x 8 240 x 9
1000 1391 300 x 6 225 x 7 —
750 1043 400 x 4 240 x 5 185 x 6
650 904 300 x 4 225 x 5 150 x 6
625 870 300 x 4 185 x 5 120 x 6
600 835 240 x 4 185 x 5 120 x 6
500 696 300 x 3 185 x 4 120 x 5
450 626 240 x 3 150 x 4 95 x 5
380 529 400 x 2 185 x 3 120 x 4
320 445 300 x 2 150 x 3 95 x 4
285 396 225 x 2 120 x 3 70 x 4
250 348 400 x 1 185 x 2 95 x 3
225 313 400 x 1 150 x 2 —
200 278 300 x 1 — —
180 250 240 x 1 — —
160 223 185 x 1 — —
140 195 150 x 1 — —
125 174 120 x 1 — —
100 139 95 x 1 — —
82.5 115 70 x 1 — —
75 104 50 x 1 — —
62.5 87 35 x 1 — —
50 70 25 x 1 — —
30 42 16 x 1 — —
25 40 10 x 4 — —
20 40 10 x 4 — —
15 32 6 x 4 — —
25 (Single Phase) 125 50 x 2 ——
20 (Single Phase) 80 35 x 2 ——
15 (Single Phase) 63 25 x 2 ——
Notes :
1. Use 3-1/2 core armored power cables with aluminium conductor. (AYFY)
2. Current rating of cables are taken based on operating temperature of 70
o
C.
3. For multiple runs of cables deration factor of 0.75 is considered i.e. 25% deration applied.
4. AYFY : Aluminium conductor, PVC insulation, Steel strip armour, PVC outer sheath.
5. Cable sizes mentioned are in square mm.
6. For sets above 1000 kVA use of proper busbars in bus ducts is recommended.
7. Earthing as per IEC rules to be provided.
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