> I'm trying to put together a wiring design for the new shop.
You will save money by standardizing on #10AWG for 30A circuits and #12AWG
for 20A circuits.
This will allow you to buy full spools of wire to get best price.
Dedicate a 2P-30A C'bkr for each load. If you do this up front, you will
have taken future expansion into consideration.
If down the road you buy added equipment, then is the time to consider
sharing a receptacle, not now.
Start with a 12/24 load center equipped with a 60A Main.
12/24 translates into 12 full size c'bkrs or 24 half size c,bkrs.
I'd use 1/2 size c'bkrs.
Load the panel full of 2P-30A c'bkrs, then fill remaining spaces with 1P-20A
C'bkrs are a relatively low cost item and the price is only going to go up.
If code will alow you, run 3/4" plastic conduit, otherwise you are stuck
running thin wall.
Use double gang boxes and install 2 gang, 20A, duplex receptacles every
8-10ft or closer if the spirit moves you. (This provides 4 outlets/gang box)
Use double gang boxes for the 240V-30A receptacles. You will appreciate the
Running a neutral with the 240V circuits is optional.
It all depends if you need a 120V circuit for the equipment you are using.
DON'T try to double up runs to save some conduit. Sooner or later, it will
come back to bite you.
Run individual conduit runs.
Good luck and have fun.