Motor Service Factor Calculator

How Motor Service Factor works

The governing expression is load = rated hp × service factor. Motor Service Factor uses Rated horsepower, Service factor to report Permitted service-factor load.

With the loaded values, permitted service-factor load evaluates to 23.00 hp. Vary one measured quantity so the source of the difference stays clear.

Inputs for Motor Service Factor

Rated horsepower and Service factor belong to Motor Service Factor. Keep source units with rated horsepower.

Actual ratings and readings should replace the demonstration values.

Rated horsepower

Example entry: 20 hp.

Service factor

Example entry: 1.15.

Reading the Motor Service Factor result

This output represents Motor Service Factor.

A numerical answer cannot replace the rating and protection checks for the real equipment.

Measurement and units

Motor nameplate data, duty, enclosure, starting method, load profile, and thermal limits govern final selection. Check prefixes on rated horsepower.

Normalize units before judging one electrical case against another.

Limits of this calculation

Continuous use of service-factor capacity can shorten life.

Additional electrical behavior needs its own measurement or calculation. Unentered effects remain outside Motor Service Factor.

Motor Service Factor record notes

Record source and operating details for rated horsepower. Use Motor Poles Frequency Calculator as the follow-up for required pole count.

Retain raw permitted service-factor load beside its selected rating.

Questions about Motor Service Factor