Electrical – Are there any NEC restrictions for wiring 220v and 110v sockets on the same dual pole breaker

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I am working on an electrical upgrade for my garage. Some equipment I have requires 20A 220V power. Other equipment only needs 15A or 20A 110V. I would like to run in from a single circuit protected by a dual pole 20A breaker.

Are there any NEC restrictions to wiring 220V and 110V outlets to the same circuit.

Here is my wiring diagram:

110V & 220V wiring diagram.

Best Answer

Use a two-pole, common-trip breaker and you're set

Since you're dealing with a 20A circuit (where 15 and 20A receptacles are allowed), you can set up this mix of receptacles provided you handle it as for any other combination 120/240V load: all four wires need to be there, as shown in your drawing, and the breaker that protects it needs to be a two-pole, common trip unit (no handle ties here!). This is written into the Code, albeit somewhat awkwardly, as 210.4(C) exception 2:

(C) Line-to-Neutral Loads. Multiwire branch circuits shall supply only line-to-neutral loads.

Exception No.1: A multiwire branch circuit that supplies only one utilization equipment.

Exception No.2: Where all ungrounded conductors of the multiwire branch circuit are opened simultaneously by the branch-circuit overcurrent device.

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