4

I'm trying to wire an outlet for my lathe. The manufacturer recommends a 15 amp breaker. I am planning to run 10 gauge wire approximately 25' to the outlet where I can plug in my lathe. The motor is rated at 8 amps. I currently have an empty 20 amp breaker for 220 in my box. Here are a few pics of what I'm thinking of using.

The first is the plug for the lathe:

lathe controller and plug


The second is the motor specs of the lathe:

motor specs


Would the following 20 amp outlet work for this?

20A outlet

I've wired 110 but never 220. Also BTW it has a phase converter allowing it to run off 1 phase.

7

You may know that on 120V circuits, you are allowed to use 15A receptacles on a 20A circuit. This is a special exception that only applies to 15A receptacles only on 20A circuits.

The Code says nothing about voltage.. You can use exactly the same exception on a 240V 20A circuit. You are free to use 15A or 20A receptacles (NEMA 6-15 or 6-20).

If you use a 20A receptacle (NEMA 6-20), the 15A plug will fit in it just fine. They are keyed to do that. (Just the same way as 120V NEMA 5-20 sockets will accept the common NEMA 5-15 plugs.)

There is only one gotcha: if there is only one socket in the whole circuit, the socket size must match the breaker size. So if you use a NEMA 6-15 on your 20A circuit, make sure it's the usual twin-socket receptacle, don't use a one-eye.

  • 1
    Hey thanks! That clears things up. Would this outlet be appropriate to match? It's a 20 amp, just has an extra T in it, I'm guessing to designate that its 20 amp?homedepot.com/p/…-PIPHorizontal2_rr--301207379--100356999--N – Bace Juex Nov 22 '18 at 19:47
  • The T allows it to take both 15A and 20A plugs. – Peter Green Nov 23 '18 at 0:11
  • @BaceJuex yes, that will be fine, just make sure it's on a 20A breaker. They also make those in duplex if you want two sockets. – Harper Nov 23 '18 at 0:55
1

You may be close on the actual power needed if you reduce down to 15 amp protection. the motor is 8 amp 3 phase so if using single phase 240 to power the inverter 1.73 is the factor plus the losses of the inverter and the control starter , work light. since lathes are not a continuous duty device it may work but will be close. I would want to use a 20 amp outlet and keep the 20 amp breaker.

  • Thanks all, very helpful, just had to re read a couple times. I think I'll go with the 20 amp receptacle. – Bace Juex Nov 22 '18 at 20:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.