In a mobile home park I am installing a sub panel off of a meter pedestal that is about 200' away. The sub panel is a 2 circuit ,30A feeder for entrance and sign lighting. Because this is more than 1 circuit do I need to drive a ground rod? NOTE : This panel is not going to be installed on or in a building. It is going to be installed on a 4 X 4 post in the middle of an island that separates the in and out entrances. Comments Please.