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I'm wanting to make sure my shopping list is correct for my mini split install.

The mini split, Senville SENA-09HF, uses a 12/3 wire and requires a 15 amp breaker. I'm planning to buy a non-fused disconnect box and an electrical whip, but 12 gauge whips seem to be uncommon.

Would I be safe to use a 10 gauge whip off of the disconnect box to the outdoor condenser unit?

I could feed my own 12/3 through the conduit but first wanted to know if there's even a need to. My intuition tells me this would be fine but this wouldn't be the first time it's failed me.

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  • If you want to pull larger wire into a conduit, you need to check conduit fill. Your question doesn't mention conduit type, size or fill.
    – K H
    Commented Apr 26, 2021 at 7:00

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As long as the terminals on your mini-split accept 10AWG, you're fine

I'd go ahead and use the 10AWG whip as long as your mini-split's terminals can accept 10AWG wire (most power connections can). If they can't, then I'd get some black and green 12AWG THHN to replace the 10AWG the whip came with.

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Manufacturer says it only uses 3.6A, the only reason to use #12 is the instructions say to. #12 is certainly adequate, #10 would be overkill. A short piece of liquidtight and some #12 THWN would certainly do the trick.

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