I have a few questions I'd like to lump into this one, so please bear with me.
I am planning to completely rewire my main level, moving my laundry room up from the basement in the process. I decided that I want to put a sub panel in the laundry room that serves as the home run for the entire main floor. In looking for what gauge feeder wire I need, I ran across a confusing entry in the table that I am not sure what to do with.
- What does "Ampacity Dwelling" mean?
Allowable Ampacity 60C (Amps): 165 Allowable Ampacity 75C (Amps): 200 Allowable Ampacity 90C (Amps): 225 Allowable Ampacity Dwelling (Amps): 225
I am assuming that a 150A sub panel refers to the 240V, so would that mean it could technically handle 300A worth of breakers in 120V circuits?
Would a 3/0-3/0-3/0-1/0 SER copper cable be the right thing to run from my main panel to supply the sub panel for the main level? I do not mind paying extra to oversize my cable for larger derating and less wasted power from wire resistance. (I also cannot have aluminum wires in my house for unfathomable religious reasons.)
This is all part of a bigger renovation of this old house from 1978. I'm planning to upgrade the house from 150A service to maybe 300A at the meter so I can plan for the future where I need to charge vehicles. I also just got into welding as a hobby, so my 120V Harbor Freight welding setup may eventually grow into something more serious in my workshop (woodworking, 3D printing, electronics, etc.). When I upgrade my main service, I plan to have it wired to support a whole house generator, and the main panel will only supply power to the garage, HVAC, and fully-finished basement level (two bedrooms, home theater, etc.) in addition to the sub panel upstairs, of course. My house was built on a hill, so the garage comes in at the basement level, and the main level with the master suite, living room, kitchen, guest bedroom/office is above.
I want to do this once, and I want to do it right. I'm planning to have a dedicated 20A circuit for each bedroom in addition to a dedicated 15A circuit for each bedroom because you never know if you might decide to throw crypto mining rigs in every room one day. 🙂