I have a 240VAC garage outlet that will be turned on via a control relay. Is it best practice to switch/relay both lines, or just one like 120V~ loads?
240VAC Outlet – Double or Single Relay?
240vrelay
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Best Answer
I'm assuming your wanting to power some 240V appliance with this circuit. In that case, if you switch off only one of the two HOT wires, you will likely cause a problem with the appliance, depending on what it is.
Yes, you would definitely want to use a double-pole 240V rated relay for this application.