0

I have recently purchased a 220v 15 amp jointer ( 12/3 wire). The only 220v outlet that is nearby is my dryer. The dryer is on a 30amp circuit with 10/3 wire. Can I make an extension cord (say 10/3 wire) and run the jointer off the dryer outlet?

6
  • Is it 10/3 wire with both neutral and ground, or does it only have one of those? Commented Apr 10, 2019 at 15:39
  • 1
    Does the supply cable to the dryer have separate neutral and ground? Another way of asking is does it have a 4-prong plug or 3? Commented Apr 10, 2019 at 16:32
  • By any chance, is your garage wired with Multi-Wire Branch Circuits (MWBCs)? If so, adding a 15A 220V outlet may be easier than you think.
    – Nate S.
    Commented Apr 10, 2019 at 18:50
  • Can you post a photo of your dryer outlet please? Commented Apr 10, 2019 at 22:22
  • its three prong plug. that's why I bought a 10/3. Commented Apr 11, 2019 at 15:48

2 Answers 2

2

I can't speak to the code issues and/or real-world safety of running a 220V 15A device on a 30A circuit.

However, keep in mind that dryer (and range) receptacles are NOT designed for frequent usage. They are designed to sit untouched for years at a time. Where a regular plug & receptacle might get used a few times a day (and with cell phone chargers and other devices sometimes more often than that), the dryer cord/plug and receptacle may not do well being plugged/unplugged on a regular basis.

In addition, you need to make sure the dryer receptacle is a newer 4-wire receptacle - hot/hot/neutral/ground NEMA 14-30. Older dryers (or rather, older houses never upgraded) use a NEMA 10-30. It is code-compliant to continue using a NEMA 10-30 for a dryer. But you should definitely not use it for a new device. So if you have a NEMA 10-30 then, in addition to any other issues of 15A vs. 30A, etc., you should be upgrading first to a NEMA 14-30 receptacle and change the dryer cord to match and remove the neutral-ground jumper inside the dryer.

Also see: What's a simple solution to have 2 NEMA 14-30 receptacles and switch power between them? for a discussion of using a switch between 2 receptacles.

0

With a motor load you can put it on a larger breaker to prevent tripping on start up. Your extension cord should be 10 gauge because of the 30 amp breaker. You only need your 2 hots and ground for a 220v motor. At 15 amp your motor is a 2 or 3 horse and I would want to make it has thermal overload protection built in, if not I would be adding a overload unit to protect the motor with the setting at 17.25 amps or below.

2
  • The unit has a magnetic overload already on the machine, My problem is once I hocked the machine up to the dyer plug with a home made extension cord and turn it on, it smelt like something was burning. I quickly unplugged the machine and now I'm scratching my head. The extension cord is 10/3. Commented Apr 11, 2019 at 1:54
  • Are you sure it's wired for 220v is the mag a 220v or a 120v. The coil voltage stamped on it? The 10-3 should be fine I know these are probably things you looked at but we can figure it out.
    – Ed Beal
    Commented Apr 11, 2019 at 23:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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