Replace electrical panel without a main disconnect
I'm sure you know this, but you definitely want to replace any Federal Pacific breakers in your house, as they're known to not trip, overheat, and/or catch fire! You might give the box a close inspection, my in-laws house has a Federal Pacific panel and the main panel instead of having a main disconnect breaker at the top of the panel, it has them in the rows to the side among the regular breakers, and the only way you know they're the main disconnect is the breakers are 100A each and they're marked "main" but they're the same size as the other breakers. Yours might be hiding in there as well. I'm not sure in Canada, but here in the US, unless local codes are different, if you've got a main disconnect that's separate from the rest of the panel, you can do your own work on the panel, but you can't touch the main disconnect, whereas if it's all part of the same panel, the power company won't pull the meter or otherwise disconnect it unless it's requested by a licensed electrician, and then it either has to be worked on by an electrician, or at least inspected and done up to code before they will turn the power back on. Running into this issue right now at my house, it has the original 1954 fuse panel with glass fuses and it's going to be $2500 to have it replaced!