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Motor Full Load Current Table (3 Phase)
Motor full load current table for three phase squirrel cage induction motors, used to size conductors, fuses and overload protection.
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Full load current in amperes
| hp | kW | 208 V | 230 V | 460 V | 575 V |
|---|---|---|---|---|---|
| 1/2 | 0.37 | 2.4 | 2.2 | 1.1 | 0.9 |
| 3/4 | 0.56 | 3.5 | 3.2 | 1.6 | 1.3 |
| 1 | 0.75 | 4.6 | 4.2 | 2.1 | 1.7 |
| 1 1/2 | 1.12 | 6.6 | 6 | 3 | 2.4 |
| 2 | 1.49 | 7.5 | 6.8 | 3.4 | 2.7 |
| 3 | 2.24 | 10.6 | 9.6 | 4.8 | 3.9 |
| 5 | 3.73 | 16.7 | 15.2 | 7.6 | 6.1 |
| 7 1/2 | 5.59 | 24.2 | 22 | 11 | 9 |
| 10 | 7.46 | 30.8 | 28 | 14 | 11 |
| 15 | 11.19 | 46.2 | 42 | 21 | 17 |
| 20 | 14.91 | 59.4 | 54 | 27 | 22 |
| 25 | 18.64 | 74.8 | 68 | 34 | 27 |
| 30 | 22.37 | 88 | 80 | 40 | 32 |
| 40 | 29.83 | 114 | 104 | 52 | 41 |
| 50 | 37.29 | 143 | 130 | 65 | 52 |
| 60 | 44.74 | 169 | 154 | 77 | 62 |
| 75 | 55.93 | 211 | 192 | 96 | 77 |
| 100 | 74.57 | 273 | 248 | 124 | 99 |
| 125 | 93.21 | 343 | 312 | 156 | 125 |
| 150 | 111.86 | 396 | 360 | 180 | 144 |
| 200 | 149.14 | 528 | 480 | 240 | 192 |
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About this Table
Motor full load current table for three phase squirrel cage induction motors, used to size conductors, fuses and overload protection.
Basis: NFPA 70 (NEC) Table 430.250, full load current for three phase induction motors running at usual speeds with normal torque characteristics.
How to use
- Find the motor hp (or nearest kW).
- Read the current at the supply voltage.
- Use the table for conductor and short circuit protection; set overloads from the nameplate.
Notes
- For 220 to 240 V use the 230 V column; 440 to 480 V use 460 V; 550 to 600 V use 575 V.
- IEC motors at 400 to 415 V draw roughly 10 to 15 % more current than the 460 V values; always check the nameplate.
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Frequently Asked Questions
What is the full load current of a 10 hp motor at 460 V?
14 A from NEC Table 430.250.
Should I use nameplate or table current?
Table current for cables and short circuit protection, nameplate current for overload settings.
Does this apply to single phase motors?
No. Single phase motors use NEC Table 430.248.
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Learn more on the blog
How an AC induction motor works
A practical guide on instrumentationblog.in that explains the engineering behind this table.
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