Question

Will a 6 15P plug into a 6 20R?

Answer 1

A NEMA 6-15 plug has two horizontally-aligned straight-blade prongs and one horseshoe-shaped prong. ... A NEMA 6-15 plug is for a 250-volt, 2-pole circuit with a ground. It's what you use to supply electricity to some window-mounted air conditioners and commercial office equipment.Sep 12, 2018

How to Wire a NEMA 6-15 Plug | Hunker

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The fact that your NEMA 6-15 plug physically fits in a NEMA 6-20R receptacle tells me it is a supported configuration.