- 125 Amp panel outside the house (Eaton BR type)
- 18 of 20 spaces filled
- Only 2 dedicated kitchen circuits, others piggybacking on rest of the house
Install a 200 Amp sub panel with 42 spaces inside the house (Square D QO142M200PQCVP)
Feed this panel using 100 Amp breaker installed in the Eaton BR main panel
Add new kitchen circuits, and relocate some circuits from main panel to the sub
service wire (individual 3AWG copper THHN/THWN or 1/0 Aluminum SE-2)
- Eventually this subpanel will become main panel, which is why I opted to go with 200 Amp rating and 42 spaces.
Should I / Can I future proof wires?
According to ampacity charts, if I wanted to future proof service wire, I would have to go with
250 Alto safely conduct 200 Amps downstream from the meter. Aside from substantially bigger expense, is this even technically/physically possible? Do the 100 Amp breakers even take a cable that large?
Perhaps the thing to do is to stop worrying about future proofing so much. After all, I can always move the main panel to the garage and convert it to a sub panel and that way not have to waste the 100 amp rated feeder cable I will be using now.
Edit 1: Since I am opening the entire wall to install the sub-panel, is it advisable to install as many conduits as there are knockouts to extend from the box through top and bottom plates for future circuits? I wouldn't want the next homeowner to have to reopen the wall.
Curious to hear your thoughts and rationale.