Current Logic: For a 100amp panel, it looks like this would typically require 3 AWG THWN wire (seems that SER isn't rated for use in conduit and I've seen 3AWG (all references. Subpanel will power yard lights, bbq island, and workshop/shed (160sq ft with basic contractors table saw, drill press, etc.). No loads were given, even if they were, you still have a tub that is 100a rated, and a breaker that is 100a rated. 8-104 (1) says the rating of the feeder is the breaker or wire whichever is smaller, therefore it is 100a rated. Also occasionally it is cheaper and easier to have a second meter if your local electric company has a low minimum billing amount and includes so many feet of new service wire burial for free you might pay more over a long period of time with the monthly base rate, but you don’t have to come up with $5k for wire/conduit/excavation/labor to run a subpanel from your existing service. When it comes to the lines connecting master and secondary panels, where the line will carry as much as a full 100 amps, use a 2-gauge non-metallic sheathed. Loads on subpanel: 100amp breaker at main. It is being fed and protected by a 100a breaker. With electricians talking about MHF with reduced neutrals or full-sized/triplex/SER/URD/URD double rated/URD triple rated/USE2/conduit/direct burial/overhead, etc. Feeder sizing is a bit of witchcraft especially when figuring out the cheapest route to take with whatever conduit/wire type might have a current shortage or price-hike, as you can see if you google “feeder sizing for adu / garage / shop” and look at electrician forums. Nice to go in and get to ask what’s normal locally. Most places direct burial is normal, but there are some places with the type of rocks/soil that use conduit more often. By: conquerall1 Sub panel 100 amp wire size.If you need to install a 100-amp service in your home, you’ll need to know how much wire you need to run the wiring. However, I think you should go in your local electric supply house and ask them what wire you’d use for a detached building subpanel run underground for 100a service run 180’. I have ordered from Nassau and “wire and cable your way.” Way better pricing than electric supply house.
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