I still see nothing there that prevents 240v receptacles in a dwelling.
(C) 277 Volts to Ground. Circuits exceeding 120 volts, nomi‐
nal, between conductors and not exceeding 277 volts, nominal,
to ground shall be permitted to supply the following:
(1) Listed electric-discharge or listed light-emitting diode-
type luminaires
(2) Listed incandescent luminaires, where supplied at
120 volts or less from the output of a stepdown autotrans‐
former that is an integral component of the luminaire
and the outer shell terminal is electrically connected to a
grounded conductor of the branch circuit
(3) Luminaires equipped with mogul-base screw shell lamp‐
holders
(4) Lampholders, other than the screw shell type, applied
within their voltage ratings
(5) Auxiliary equipment of electric-discharge lamps
Informational Note: See 410.137 for auxiliary equipment limita‐
tions.
(6) Cord-and-plug-connected or permanently connected
utilization equipment
(2017)
I assume the listing might prevent a piece of equipment less than 1440w or 1/4HP with a 6 xx plug but that happens after we leave.
Just looking at inverter window shakers they all seem to be 120v, even the ones that are over a ton. I remember a lot of old Fedders 1 ton+ units were 240 tho. They were power hogs with 2 compressors. The street lights dimmed when they came on
