Cable Selection Chart for motors

 

Cable Selection Chart for Induction Motors (3-Phase, 415V, 50Hz)

When selecting cables for induction motors, it is important to match the motor rating (kW) with the correct cable size to ensure safety, efficiency, and compliance with standards.

The following table provides the recommended copper cable sizes for motors at 415V, 50Hz supply frequency.
(For aluminium cables, increase the size by 1.5 times that of copper cables.)

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📊 Motor Cable Selection Table (Copper Cables)

Motor Rating (kW)	Full Load Current (A)	Recommended Copper Cable Size
0.06	0.21	1 × 3 Core × 1.5 mm²
0.09	0.32	1 × 3 Core × 1.5 mm²
0.12	0.38	1 × 3 Core × 1.5 mm²
0.18	0.58	1 × 3 Core × 1.5 mm²
0.25	0.70	1 × 3 Core × 1.5 mm²
0.37	1.10	1 × 3 Core × 1.5 mm²
0.55	1.30	1 × 3 Core × 1.5 mm²
0.75	1.80	1 × 3 Core × 1.5 mm²
1.1	2.40	1 × 3 Core × 2.5 mm²
1.5	3.20	1 × 3 Core × 2.5 mm²
2.2	4.50	1 × 3 Core × 2.5 mm²
3.0	5.90	1 × 3 Core × 2.5 mm²
3.7	7.30	1 × 3 Core × 2.5 mm²
4.0	7.70	1 × 3 Core × 4 mm²
5.5	10.5	1 × 3 Core × 4 mm²
7.5	14.0	1 × 3 Core × 4 mm²
11	20.5	1 × 3 Core × 6 mm²
15	27.0	1 × 3 Core × 10 mm²
18.5	33.0	1 × 3 Core × 16 mm²
22	38.0	1 × 3 Core × 16 mm²
30	52.0	1 × 3 Core × 25 mm²
37	64.0	1 × 3 Core × 35 mm²
45	78.0	1 × 3 Core × 50 mm²
55	97.0	1 × 3 Core × 50 mm²
75	132	1 × 3 Core × 70 mm²
90	156	1 × 3 Core × 95 mm²
110	187	1 × 3 Core × 120 mm²
132	221	1 × 3 Core × 150 mm²
160	260	1 × 3 Core × 185 mm²
200	330	1 × 3 Core × 240 mm²
250	415	1 × 3 Core × 400 mm²
315	520	2 × 3 Core × 300 mm²

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🔎 Notes for Practical Use:

·         Aluminium cables: Multiply copper size by 1.5.
Example: If copper requirement = 50 mm² → Aluminium = 75 mm².

·         Ambient temperature & installation method may affect cable sizing. Always check derating factors from IS/IEC standards.

·         For long runs, consider voltage drop calculations.

·         Ensure compliance with local electrical codes (IS 7098 / IEC standards).

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👉 For detailed charts:

·         Motor Current Ratings

·         Cable Size & Current Capacity

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