If the nameplate information of a motor is 208V, 3-phase, 15 HP, 42 Amps, and 1.10 Service Factor, what are the necessary new overloads?

To determine the necessary new overloads for the motor, you first need to understand how to calculate them based on the motor's full-load current and service factor. The nameplate indicates the motor's rating of 15 HP and a full-load current of 42 Amps.

When calculating the overloads, it is essential to consider the service factor of 1.10. The service factor indicates how much more the motor can handle beyond its rated full-load. Essentially, the overloads must be set to accommodate the increased current that results from running the motor at a higher capacity due to its service factor.

To find the acceptable overload current, you take the nominal full-load current and multiply it by the service factor:

Overload Current = Full-load current x Service Factor

Overload Current = 42 Amps x 1.10 = 46.2 Amps

Now, this value reflects the maximum allowable current when considering the service factor. Also, in general practice, it is common to set overloads to a percentage of full load, often around 125% or so, but here we are using the service factor directly to determine the overloads.

Thus, 46.2 Amps is indeed the result that considers the service