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Laundry circuit requirements cover a receptacle circuit for the laundry area, which is a separate thing from the higher-rated supply an electric dryer needs.

Kitchen small-appliance circuits are a specific code requirement with rules about what they may serve, not simply extra outlets above a counter.

Understanding what needs a dedicated circuit means separating code requirements, manufacturer instructions and simple convenience, which are three different things.

Ambient temperature derating matters because a cable in a summer attic starts hot, leaving far less thermal headroom before its insulation is at its limit.

Bundled conductor derating applies because cables packed together cannot shed heat, so the ampacity printed in the table no longer describes the installation.

Mixing 14 AWG into a circuit protected at 20 amps leaves the smaller conductor unprotected, and the mistake usually hides inside an extension of old work.

A breaker protects the wire in the wall from overheating; it is not an appliance guard, and upsizing it to stop nuisance trips is dangerous.

Running NM cable in conduit protects it mechanically but does not change its rating, and a conduit outdoors or underground will not stay dry inside.

NM cable staple support is about securing the run and protecting the sheath, and a staple driven hard enough to deform the cable defeats both purposes.

Backstabbed receptacle connections often keep working long after the contact has degraded, which is exactly why the resulting heat goes unnoticed.