Join Date: Apr 2006
Thanked 170 Times in 167 Posts
Rep Power: 12
Rick, if you are thinking 2x15A breakers=30 amps, it doesn't work that way. If you are planning to hook up a second 30-amp shorepower line (30 being standard) then you need two 30A breakers, one in each side of the line, tied together. Not just two, but tied together so both trip together.
If you are planning to use the second line JUST for one item (AC?) and that draws only around 12A, then a pair of 15A breakers woudl be suitable, but normally you size the breakers to protect the line (30A line) not the load. So it all depends on exactly what you are planning to do.
These days it is also normal to install a GFI as close to the shore power inlet as possible, while installing the breakers at the main panel. GFI's are dirt cheap and pretty good at saving lives.