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.