First of all, let me say thanks as I have frequently came here as a visitor to find answers to my various DIY issues of the day.
However, today, my question is left unanswered from searching the forum, hence my posting for your help.
I live in a town house that is one of 10 units. Electricity arrives outside in the DWP meters with a 90A main breaker circuit there for my unit. Inside the unit, we have a 12 space / 24 circuit main lug that connects all circuits. The box is 30 years old and has no door, leaving all cables visible.
As I understand that finding a cover for an unknown box is a task not worth spending time on, I decided to change the box for an inexpensive Square D 125A box with approximately similar height and width. (HOM1224L125TC)
Square D also offers similar box with a 100A main breaker for $20 more (HOM1224M100TC) which would give us the convenience of having a main breaker inside the house instead of having to go out in the main DWP box to do so (for example if we need to change a breaker, leave the unit empty for a while, etc).
My question is as follows: if I buy the 100A main breaker box, will I be able to find a 90A main breaker for it so that should the main breaker need to trip, it would trip inside and not outside? (it seems a bit pointless to me to have a 100A breaker on a 90A line
Thanks for your help!