I have what is rated by the electric company as a 200A entry into the house, but use a limited amount (largest draws are my HW tank, oven and Heat Pump). Recently, I was looking at upgrading some heating elements for my HVAC and I realized that I need to calculate an additional 60A for the elements. So I checked my entry to ensure that I had a 200A fuse there and was surprised to find only 130A.
However, I have the old style fuse cutoffs - with a dedicated fuse per phase. Each phase has a 130A fuse on it.
Does that mean then that I actually have a 260A rating on my entry at the moment? (ie: up to 130A/phase?)
Further, I have a SquareD subpanel with a 120A master breaker on it. Does that imply 120A total draw to the entire panel, or 120A/phase?