Electrical Repair Questions? Ask an Electrician for Answers ASAP
Welcome. My name is XXXXX XXXXX would be glad to assist.
I show that motor as :
That is correct
So, you need to have a 20 amp breaker for feeding with #12 wire at a maximum distance of around 75 feet
That is a double pole 20 amp. 2 phases and ground wire to the motor. No neutral needed.
Thank you. I'm glad I checked. I was told by someone that it needed a 30 amp with #10 wire.
Only 15 amps. It should start fine with a standard short distance.
The distance is less than 25 feet.
You should be fine then
May I ask about another motor?
I have an air compressor. Campbell Hausfeild Model VT619503AJ with a Doerr Emerson motor #LR22132. Does this need a 30 amp breaker?
do you have the nameplate information?
I will try to find it also
what is listed for the voltage and amperage?
15 amps , 240 volts. The L.R. Amps = 93.
That is the same as the other unit
The LR is the Locked Rotor amps if the motor were to be locked down
Motors ten to pull around 6 times running for a brief second when starting
If the application is standard, a regular breaker will take care of the inrush. If it will be a very Hard Start case, then need to look at up sizing the breaker, which requires upsizing the wire also.
what is a very Hard Start?
A motor that is under a a high load when starting.
Small compressors overcome quickly and normally not a problem unless you are trying to control a high pressure point in the tank. Then the motor has to overcome the pressure in the tank to start pumping.
If you set the switch at say, 80 psi and turn it off at 115 psi, then that is not too hard of a start.
If you are going to start it at 100 and control to 115, then that may require an upsize.
I see... thank you.
I always do a test. Short cord to the breaker and run a test to verify the difficulty starting
As a compressor or pump gets old and wears, it too will cause a higher current
I think I'll run #10 wire with a 30 amp breaker. The cost difference small. Much cheaper then if I need to upsize later.
That will provide a good overage safety point.
Most applications are not too severe on the start load. What happens, if there is a load at starting, it escalates the current drastically. Under normal on off type situations at low load, it isnt an issue.
The fist motor is on a table saw. When cutting thick stock and the motor is under a heavier load, does that increase the current draw?
The starting is what you need to be aware of, so on a saw, it will come up to speed easily. The load is not higher when cutting, only if you jam the blade.
Table saws are easy starters
Ok... then a 20 amp is fine.
should be great, circuit by itself though.
Absolutly. Thanks again for your help
you are welcome, glad to assist