Controlling two motors with one contactor.

[delectric123]

i have two small Grundfos circulating pumps side by side. one 115v 1 ph. with FLA of 3.0 amps, and the other 208v 3 ph. with 2.5 FLA. The required individual disconnects, and a start-stop with thermal overload for 3 ph. pump is located at the pumps. in addition to that, i want to remotely start and stop both pumps. Is it allowable to power both pumps from a 3-pole contactor, plus a neutral for the 115v pump?

 

[petersonra]

i have two small Grundfos circulating pumps side by side. one 115v 1 ph. with FLA of 3.0 amps, and the other 208v 3 ph. with 2.5 FLA. The required individual disconnects, and a start-stop with thermal overload for 3 ph. pump is located at the pumps. in addition to that, i want to remotely start and stop both pumps. Is it allowable to power both pumps from a 3-pole contactor, plus a neutral for the 115v pump?

I think you could probably find a code legal way to do this but it seems like for such small motors the cost of doing so might not be worth the effort.

you can get contactors for these size motors for $20.

 

[delectric123]

the reason i would like to is limited breaker space. it would free up a 1 pole 15 amp breaker.

 

[petersonra]

the reason i would like to is limited breaker space. it would free up a 1 pole 15 amp breaker.

they can be on the same breaker and still have separate contactors.

 

[tom baker]

Are the motors thermally protected?

 

[delectric123]

yes

 

[acrwc10]

Does the manufacture require a dedicated circuit in the installation instructions? This is where the devil is in the details.

 

[delectric123]

no, just overload protection for 3 ph. pump, which is already furnished