Reply Tue 30 Jun, 2015 07:22 am
I have electrical heating units in my home that are 220v. I want to abandon one unit and use the wiring for a mini-split condenser unit. Amperage of mini-split is lower that the heating unit, so is no concern with existing wiring.
My problem is the heating unit only has 2 hot wires and a ground. I this normal?
I was expecting a neutral wire also.
Is it ok to wire the mini-split with just the 2 hots and a ground?
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Reply Tue 30 Jun, 2015 10:14 am
Good q, Dan, as 220 v can become very confusing: Either it's single phase or two-phase; you have to know the diff!

So what you have is either single-phase (where neutral is at about the same potential as safety ground) or two-phase (two hot wires) where no neutral is required

Doubtful if it's the case but you could have two-phase with a neutral, for equipment requiring both 220v and 115v but the safety ground is somehow missing. For reasons of safety you should read up on this stuff; and get an inexpensive voltmeter to distinguish the various conductors
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