Code dictates that one shall use nameplate data, or calculations for the specific motor, failing those, one shall use code supplied data.For single phase, if you incorporate both efficiency and power factor into the calculation, the results come out pretty close, except for the case of no load. Using the Leeson data for a 1 HP motor, one gets:
JohnRich (BB code):Output HP, W(HP) Actual A Efficiency PF Calc. A 187 (0.25) 3.95 0.491 0.426 3.87 373 (0.5) 4.44 0.635 0.583 4.37 560 (0.75) 5.13 0.685 0.694 5.12 746 (1.0) 5.99 0.705 0.766 6.01 1119 (1.5) 8.28 0.684 0.839 8.49
Motor starting currents can be 6 x FLA, so to answer your question, absolutely not. You need a dedicated motor starter which is comprised of a suitable contact and overload protection. Along with that you will need additional overcurrent protection and branch circuit isolation.from the Above table, it seems i can use 10A, 230VAC Relay. is it right?
You may also want to take not that your motor is 0.5 HP, not actually 1 HP. At least that is what the nameplate says according to this post.Here are my exact Motor ratings I got from the Name Plate,
Max Current - 3.5 A
Volt - 240V
Fr-50Hz
0.37KW
0.5 HP.
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