I want to install charging piles, 7KW, rural self-built houses, currently bought a 1.5-meter ground pin, 2P40A leakage guarantee one, please ask how big the power line and ground wire are, I bought when there is a charging gun to send, is Suning sales said that the gun does not accompany the car, so I bought the pile in advance, I want to connect the charging pile and a 16A socket at the same time behind the leakage of insurance, so that the pile and the gun can be used, is it feasible? Electrician xiaobai one