Thank you for the response. My step father is an electrician but unknowledgeable when it comes to 3 phase.
Proud owner of a VT-PL-735-60 Saylor Beall compressor from a Toyota dealership closing their doors after 51 years. Helping a friend vacate the building disconnecting everything electrical, tyre changer, lifts, compressors, lighting, tyre balancing machines. Like a kid in a candy store helping a friend then telling him i'm interested in the SB compressor of four years age back in 2019. Delivered free to my home shop 3 phase powered SB compressor of $250. Had a NIB 5 Hp Baldor compressor / fan motor stored storage away 5 Hp single phase along with the rated magnetic starter. Changed out heaters a wish come true replacing a 47 year old Quincy oil sucking freebie from a paint shop owner retiring years ago. This SB with pressure lube with low oil shutdown protection is quiet vs the old Quincy compressor when Quincy was top of the list now corrected, must add Saylor Beall is top of the list over Quincy. New Quincy has become rubbish (kind words) vs old Quincy being told by Quincy service techs more than once like four times over the years while working around service techs. Curtiss along with Kellogg-American rebuilt pumps if in good condition will also out live a young owner.
Not to be rude but wow, your step father must be a DIY residental type of "Sparky" at best vs a I.B.E.W. trained Journeyman wireman. Leave out house wiring I.B.E.W. wiremen. Popular Mechanics magazine self taught comes to mind the type post fire investigation teams report stating as "illegal wiring cause of fire", there goes your home owner's insurance coverage "up in smoke" policy "denied coverage". Commercial & industrial 45 year I.B.E.W. wireman, have seen it all the results of unqualified wiring damage / fires included. That's what overload heaters in magnetic starters are for "if properly rated" amperage installed protecting motors. Three phase first check all three legs hot "after the fuses" or load side of magnetic starters. Pitted blown away contacts in a mag starter being in service 30 years finally filing as example. Overfused with undersized wiring practices along with length of wire run not considered or applied vs 310.16 to 310.19 NEC code book our Bible vs some type of church belief saving a life. Fire damage rebuilding is a nasty job I avoided along with "dingbat" trouble shooting house call wiring issues (neighbors especially) on 50 or 80 plus year old houses that had butchered electical added several times over the years now a fire time bomb in the wait a burndowned home.
Don't forget inital startup inrush current spike before normal motor rpm's has been established having proper wire gauge feeding the motor including heaters. Cheap "junk" imported motors drawing higher running amps than as example a quality you must pay for Baldor compressor or fan duty motors. I'll take a 1,780 rpm 5 Hp motor over any 3.450 rpm motor no matter the brand along with low rpm pump heads producing less heat than cheaper high rpm pumps also having a shorter pump life.
Becareful out there, ask if your over your head dealing with electrical. You can't see electricity, if you can't find it, it sure can find you in a shocking way. End of rant.....~~=o&o>......