Compressor wiring

[nickz]

Can I use an existing run that leads to my welder, junction off that and run a 22amp compressor that will be switched off when not in use?
I have 6ga to the Lincoln that has a 50 breaker in the panel. this will also run the compressor when welder is not in use.
I'm will hard wire to the compressor switched and a contactor.
Pics...

 

[pattenp]

If compressor motor has its own overload protection then it's okay. Hardwire the compressor with the same size wire as the circuit.

 

[sberry]

Wouldn't it need to be wired big enough for the motor? I can't recall if I see motors that side with own thermal and its been a look long time since I read it. But,, as we read in other threads over size wire may require different grounding , seems like maybe using a 10 whip would meet the intent???
But,,, since this looks piped on surface,, and I had panel spaces would be inclined to run a circuit for the comp. What welder is this? If I didn't have panel spaces this might be e time and place I might be inclined to make them.

 

[pattenp]

I didn't want to make a ******* situation out of it by suggesting a #10 whip. If the motor doesn't have thermal overload (red reset button) on it then it should have it's own circuit sized to the motor HP.

 

[sberry]

I believe 5 hp still allows 50A. Personally not a huge fan of running it a lot higher than needed.
I also don't care for plug/unplug and this calls for hardwire, would so much rather have a circuit for it. It's just natural for me to add the circuit for additional equipment, just part of the plan from the start.
Doing one for a guy now that the utilities are the last after thought.
First thing on my mind is getting power established, maybe even air, cover for tools and material.

 

[nickz]

I believe I will add a new line with appropriate ga wire and breaker.
I found the hp ratings funny label on tank, 5rhp! Rating on motor? 6hp?! They got it backwards!! It may not even be 5, who knows now a days, it does have a red button, so that says something.
Compressor tech told them motor is bad, it had a burnt contact on pressure switch, so I will add a new switch and a contactor. Compressor cost me 250!!
Sberry, the welder is a 175 Squarewave.
Thank you for the pointers guys, very much appreciated. Love this forum, allways,always lurking.

 

[wyliesdiesels]

I believe I will add a new line with appropriate ga wire and breaker.
I found the hp ratings funny label on tank, 5rhp! Rating on motor? 6hp?! They got it backwards!! It may not even be 5, who knows now a days, it does have a red button, so that says something.
Compressor tech told them motor is bad, it had a burnt contact on pressure switch, so I will add a new switch and a contactor. Compressor cost me 250!!
Sberry, the welder is a 175 Squarewave.
Thank you for the pointers guys, very much appreciated. Love this forum, allways,always lurking.

post a pic of the nameplate.

Sounds like the pressure switch was not rated for the 5HP of the motor. This is why motor starters are a better setup for large motors.

If it ends up running after minor repairs, then you got a good deal

 

[nickz]

Condor mdr11/11e not cut out for the job, cheapest part to make it past warantee.i think I will be cool to add a new same switch and contactor utilizing the thermal on the motor.