Space Heater Calculation

Thanks really great comments and article.

God Bless

Rabat

Is this motor shut down often? Otherwise I would bet it's own heat would be more than enough to keep it dry

Motor space heater (or anti-condensation heater) is required considering that the motor will not run 365 days in a year, it will remain stopped for a period of time. The space heater is turned on only when the motor is stopped for the preventing of the ingress of moister into the armature insulation. In North America, any motor equal or greater than 15 HP requires space heater.

- MS

Wow, I have never seen this ever before.

I for the past 15 years have worked around some pretty big horsepower motors, not sure what they were in horsepower but they were both AC and DC motors that ran on 480 volt 3 phase power and running currents were between 400 and 500 amps. Prak amps were off the meter and it read up to 600 amps.

And these motors (28 of them) were in cement buildings that had humidity levels exceedimg 90% all the time It was an extruder with water bath cooling so the humidity was horrid. In the summer months it would exceed 100% humidity because it would actually rain in the building and fog was everywhere.

But these motors were just shut off every friday evening at 5, and everyone went home, and monday am at 6 am power to he floor and away we went.

stuff would actually be soaked in moisture,

and yet some of these motors other than bearings and brushes have been running since the 50's this exat same way. no heaters seen,