I would like to install a SquareD HEPD80 whole house surge protector. My electrical panel has the main line feeding in from the top, and all accessible knockouts are on the bottom of the panel -- the knockouts on the side are either in use or blocked.
I understand that it is important to put the breaker with the surge protector attached as close to the line feeds as possible (i.e. in the top slot), and that it's also important to keep the wires to the surge protector as short as possible. But in this case, I can't do both, because the surge protector has to be mounted on a knockout in the bottom of the panel.
Is it better to put the breaker in the top slot and run long wires down to the surge protector? Or would it be better to put the breaker in the bottom slot and run short wires down to the surge protector?
(This is a small panel with only 6 rows of breakers, so the difference in wire length would be about 4 inches.)