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Electrical Motors - Maximum Cable Size and Length vs. Power

Maximum electrical motor cable length vs. power.

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Three phase 230 V electrical motors and maximum cable length with 3% calculated voltage drop.

Electric Motor PowerMaximum Cable Length (m, ft)
(kW)(hk)30 (98)50 (164)
100 (328)
Cable Size (mm2)
0.5 0.68 1.5 1.5 1.5
1 1.36 1.5 1.5 1.5
1.5 2.04 1.5 1.5 1.5
2 2.76 1.5 2.5 4
2.5 3.4 1.5 2.5 4
3 4.08 2.5 2.5 6
3.5 4.78 2.5 4 6
4 5.44 2.5 4 6
4.5 6.12 4 4 10
5 6.80 4 4 10
6 8.16 6 6 10
7 9.52 10 10 16
8 10.9 10 10 16
9 12.2 10 10 16
10 13.6 16 16 16
12 16.3 16 16 16
14 19.0 16 16 25
16 21.8 16 16 25
18 24.5 25 25 35
20 27.2 25 25 35
22 29.9 25 25 35
24 32.6 35 35 35
26 35.4 35 35 35
28 38.1 35 35 50
30 40.8 35 35 50
35 47.6 50 50 50
40 54.4 70 70 70
45 61.2 70 70 70
50 68 70 70 70
55 74.8 70 70 70
60 81.6 95 95 95
65 88.4 120 120 120
70 95.2 120 120 120
75 102 150 120 150
80 109 150 150 150
85 116 185 150 185
90 122 185 185 185
95 129 185 185 185
100 136 240 240 240
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