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I plan to use a tandem(AKA duplex, slimline, twin, half-height, half-inch, double or wafer breakers) circuit breaker for kitchen.

The 20 Amp Tandem Single Pole Type QT Circuit Breaker ( here is the link to it ) will feed 2 GFCI outlets for countertop.

Now, I ask if is OK this setup. Inspector says that is OK as long the breaker is on dual phases.

Here is her answer: "You can use the slimline product, but it must be on dual phases.They each need a neutral."

What does it means? I couldn't find some info about twin breakers for dual or single phase.

cadobe
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2 Answers2

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Lost in translation

The inspector is giving you the standard warning not to use double-stuff breakers on MWBC (shared neutral) circuits. Sounds like you fully understand that requirement... and they aren't telling you anything new

Harper - Reinstate Monica
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If your inspector says you need the breaker to be on two phases, that probably means you have a Multi-Wire Branch Circuit (MWBC). That means you need a proper two-slot breaker, not typical a double-stuff -- those only can grab one phase. You can use a so-called "quad" breaker, where the internal ones (and possibly the outer pair as well) are proper common-trip two pole breakers, suitable for MBWCs. See @Harper 's answer here (and the linked answers) for the full details with pictures: Why are tandem breakers on shared neutral (MWBC) problematic?

Nate S.
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