Thanks very much! You need to make sure all 4 slots add up to 55 to turn on the elevator! ^^ Hope this helps!
Not sure if you already figured it out, but there are 2 ways to get through the fuse puzzle (and also ~1 more route where you can just ignore the fuse part with the valves).
One straightforward setup would be that you would need to remove the fuses from the doors and/or lights to activate the elevator while the other way is that you can find the required fuses hidden around the area. I won't go into detail in case you don't want to be spoiled.