Load Center Questions
I recently purchased an older home that still has a fuse box in it that I would like to upgrade to circuit breakers. It is a 100A service with a main disconnect breaker in its own box right where the service comes in to the garage. After the main disconnect it goes into the fuse box. I've been researching load centers and have a few questions.
- I understand the amperage rating on a main breaker corresponds to the tripping point of the breaker. What is the limiting factor in the amperage rating of a main-lug box? Lug size? Conductor size?
- I'd like to buy a load center bigger than 100A so I can fairly easily upgrade my service level in the future (probably to 150A). Is there a problem buying a main-lug or main-breaker box with a higher current rating and connecting it to a 100A service? The box will still be protected by the 100A main breaker upstream.
- Do the ground and neutral have to be bonded in the 100A disconnect box (the box closest to the service entrance) or can it be bonded in the new circuit panel?
Any help would be appreciated.