PENNBARRY
10
Single Phase
The above values of full-load currents are for motors running
at usual speeds and motors with normal torque characteristics.
Motors built for especially low speeds or high torques may
have higher full-load currents, and multi-speed motors will
have full-load current varying with speed, in which case the
nameplate current ratings shall be used.
The voltages listed are rated motor voltages. The currents
listed shall be permitted for system voltage ranges of 110 to
120 and 230 to 240 volts.
The table data shown above is from the NEC 2005 edition,
table 430-148.
The above values of full-load currents are typical for motors
running at speeds usual for belted motors and motors with
normal torque characteristics. Motors built for low speeds
(1200 RPM or less) or high torques may require more running
current, and multi-speed motors will have full-load current
varying with speed, in which case the nameplate current
ratings shall be used.
The voltages listed are rated motor voltages. The currents
listed shall be permitted for system voltage ranges of 230 to
240 and 440 to 480 volts.
The table data shown above is from the NEC 2005 edition,
table 430-150.
The amperages given here are approximate values only and represent averages compiled from the tables of leading motor
manufacturers. Overload relay heaters should not be selected on the basis of these tables only. Heaters must be selected in
accordance with the actual motor current as shown on the nameplate. It is also important that ambient temperatures of the
area in which the motor control is located be taken into consideration when making heater selections. Ambient compensated
overload relays are available for abnormal temperature conditions.
Three Phase
HP 115V 208V 230V
1/6 4.4 2.4 2.2
1/4 5.8 3.2 2.9
1/3 7.2 4 3.6
1/2 9.8 5.4 4.9
3/4 13.8 7.6 6.9
1 16 8.8 8
HP 208V 230V 460V
1/2 2.4 2.2 1.1
3/4 3.5 3.2 1.6
1 4.6 4.2 2.1
1 1/2 6.6 6 3
2 7.5 6.8 3.4
3 10.6 9.6 4.8
5 16.7 15.2 7.6
7 1/2 24.2 22 11
10 30.8 28 14
15 46.2 42 21
20 59.4 54 27
25 74.8 68 34
Motor Selection
Nominal Ampere Ratings
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