After installing the solar panels and wiring, the procedure of connecting the transfer switch of the system to the public utility power grid requires this be performed by a "Certified Electrician". What exactly do they mean by "Certified Electrician"? Certified by whom? Would recieving a certificate for completing a course for an electrical classification from a branch of the armed forces be considered certified? Or do they mean a licensed journeyman electrician? Thanks for your time.