I did some searches within this group on this subject, and thought I would let you all comment on my particular installation.
I am upgrading an existing 100 amp service. It consists of a 100 amp "meter/main disconnect" combination box on the outside, and a subpanel (load center) inside the house fed by long cable.
I want to add a new 100amp subpanel. The new panel will go into the garage, and feed a shop there. There is an extra breaker already in the meter/main panel, so it has
1x100 amp breaker (x2 120 volt circuits), and space for one more (two breaker positions total). However, as I understand it, I would have to downgrade to 2x50amp breakers to feed both subpanels.The city inspector told me to upgrade the outdoor meter/main to one of the new "combo" meter/main/load centers, and indeed, that seems to be all they have at the local Home Destruction store.
However, that does not seem to me to be the way to go, for several reasons:
- That would mean all of the new shop breakers would be outside, a considerable walk into the rain to reset them.
- The very much larger size of the combo units involves much more destruction of the outside wall.
- Using a subpanel allows me to get all the garage wiring done at my own pace. Using the combo would mean doing all the final connections to the panel in a panic because the house power is off due to the main disconnect.
What it appears to come down to is finding the right meter/main panel. Ideally I would like to find a meter/main that fits into the present 100amp meter main format, at 18"x12" (approx).
Thanks.