Nice project Peter!
I refer to NFPA 79 for design questions about mains power.
It is written for industrial machinery, but if you sift through it you can find guidance:

• select wire sizes based on load
• select fuse sizes for adequate protection
• grounding and bonding practice
• etc.

NFPA charges for the print edition but you can view it for free if you create an account.
https://catalog.nfpa.org/NFPA-79-Electrical-Standard-for-Industrial-Machinery-P1205.aspx?icid=D729
John