What size wire do I need for a 50 hp motor?

Motor HP NEMA amps Phase Wires (AWG)
40 52 4
50 65 4
60 77 2
75 96 2

How do you calculate the cable size of an HP motor?

Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. Example: what is the minimum rating in amperes for Cables supplying 1 No of 5 hp, 415-volt, 3-phase motor at 0.8 Power Factor. Full-load currents for 5 hp = 7Amp. Min Capacity of Cable= (7X125%) =8.75 Amp.

How do I choose a motor wire size?

Cable size calculation formula:

The cable size is equal to the 1.5 times of the full load current of the motor/load. Hence the cable rating formula can be written as, Cable size = 1.5 x Full Load Current.

What size wire is needed for a 40 HP 460V three phase motor?

What size THWN can be used for a 40 HP, 3-phase, 460V motor with an ambient temperature of 106°F? Answer: 4AWG. Solution: The full-load current for a 40 HP, 3-phase, 460V motor is 52A, 52A x 1.25 = 65A.

What size wire do I need for a 10 hp motor?

Electrical motor wiring data – NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp

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Motor HP NEMA amps Phase Wires (AWG)
5 7.5 12
7 1/2 11 12
10 14 10
15 21 10

How many watts can a 2.5 mm cable take?

how many watts can a 2.5 mm cable take? 2.5 square BV wire, overhead wiring at 20 degrees, 220 volt power supply can be up to 4.4KW. Therefore, a 2.5 square BV wire can be used with a maximum of 4.4 KW.

What size breaker do I need for a 7.5 hp motor?

You need 50 amp rated wire with a 50-100 amp breaker. 7.5hp=40 amps x 250%=100 amp breaker on #8 Thhn. If a 100amp breaker isn’t sufficient to start the motor without tripping I can then go up to a maximum of 400% of the motor rating.

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