Hi all! Thank you in advance for your experience and time! OK, I have searched alot of places and have gathered some information, but, I am somewhat confused. I just built a workshop behind my house. I have a 200 amp panel in my house , and I want to feed my sub panel from the main house panel. I am going to run pvc conduit 18" below to the workshop. I know I have to isolate the equipment and bus bars. I plan on running 3 ,
15 amp circuts and 1 20amp circut. One lights, one dedicated for my coffee roaster (draws 7amps) , one for my computer , and the 20amp for general use. What I need to be sure of is , 1. the size of the breaker I should use in my main panel. 2. The size of the wire to the sub panel. And 3. the size of the sub panel I should install. I need a panel with a main breaker in it, not just lugs. Some of the forums I have searched with similar questions to mine, the expert tells the homeowner to use 4 wire. 2 hots , a neutral and a bare ground , and other experts tell the homeowner to use 3 wire with one hot. This is what is smoking my brain! What is the difference and which wire should I use? I have alot of room in my main panel, and I draw about 100 amps. I have a small rancher house. Any help will be awesome! Thanks, Brian

coffeetaxi

And, incase you don't know, this (") means inches.