I’m adding steam humidifiers to our two HVAC units, they currently run on 110v but will double the output on 220v which we need. I’ve pulled 8 gauge wire to the panel box and will terminate in a junction box, split and run 10 gauge to each unit (short runs, about 20ft each). Max amperage is 17A for each unit.
For the double breaker I have an older 30amp double which fits (electrician removed it to install 40s for elevator); I’m assuming that means it has 30A on each leg, and therefore this breaker will work and my wiring is sufficient. Yes? Thanks for any help or comments.