Hello, First post after lot of reading... I am in need of aditionnal circuits for my house : more specifically a 40A outlet in my attached garage, and probably 60A or more to a sub-panel in a detached garage I'm planning to build this summer. So roughly around 100 more amps to what's already in place. Right now, I have a 200A fused main disconnect between the post/meter and a distribution box rated for 225A. The distribution box feeds : - a 125A fused disconnect going to a 25kW furnace - a 200A breaker panel - a 60A emergency sub panel with a transfer switch for a generator. The 200A panel is full, with a couple of twin breakers, a 60A breaker for the hot tub and many more. Adding all thoses breakers sure exceed 200A. The 60A sub panel is not full, with breakers totalling 45A to match the 5kW generator capacity. I understand than the house is not pulling all thoses amps in normal use, and is unlikely to do so, but what if I add another 100A sub-panel? The furnace alone pulls 108A with all elements on... So I guess my question is : Can I Add the sub-panel after the 200A fuses, from the distribution box or is it too much for thoses fuses? If not, what is the best option? I should add than everything that is in place right now was done by professionnals. If I do the job myself, I will have a professionnal to inspect and connect the sub-panel to the meter or distribution box. Finally, I will not work on this project if it require modifications before the main disconnect... I will post pictures of what's in place if my description is not clear enough. Thanks for your help!

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