electrical - Why Do V Circuits Not Require Neutral? - Home Improvement Stack Exchange
This tutorial shows you the basic steps of installing a new volt, amp, double-pole circuit breaker for a new amp appliance receptacle outlet. The circuit includes two gauge black hot wire conductors and a gauge green ground wire conductor for a 3-wire system with no neutral. Some volt appliance circuits use 4-wire circuits that include a neutral. This project may also require a building permit, depending on the rules in your area. Warning: Switching off the main breaker shuts off the power to the panel and all household circuit breakers but it does not turn off the power coming from the utility service lines. The lines and the terminals they connect to in the service panel remain live and carry deadly current.
We were given a welder that has a big volt plug, but our home doesn't have any V outlets already wired. What to do? Turns out the plug we had is NEMA You can probably figure out what yours is from a chart.