I have a spool of SEOOW 10/4 wire I plan to use with locking plugs/recectpacles that only need 10/3 in the setup.
Is is ACCEPTABLE to just leave the wire cut flush to the cable or am I supposed to cap off every end unterminated (inside the connector bodies ) ....which may get a little tight in the body.

Or the ONLY acceptable answer is to use 10/3 cable....