* Voltage is not the primary factor: The legality of a branch circuit depends on the ampacity, which is the amount of current it can safely carry.

* 220 volts is common: In the United States, 220 volts (or 240 volts) is the standard voltage for household appliances like ovens, dryers, and air conditioners.

* Wiring and protection matter: The legality depends on whether the branch circuit is properly wired with the correct gauge wire, appropriate overcurrent protection (circuit breakers or fuses), and follows all applicable building codes.

Here's what you need to consider:

* Building Codes: Your local building codes will dictate the maximum ampacity for a 220-volt circuit, the size of the wire required, and the type of overcurrent protection.

* Appliance Requirements: Check the appliance you plan to use. It will have a specific amperage rating, and the circuit must be able to handle that load.

* Safety First: Always consult a licensed electrician to ensure the wiring is safe and meets all codes.

In summary:

A 220-volt branch circuit can be legal, but only if it meets all the requirements of your local building code and the appliance's specifications. It's crucial to consult with a licensed electrician for proper installation.