I set up a temp pole with 2groundrods and I grounded the circuitbreaker box. the circuitbreaker box is attached with a rigid offset nipple from the hub of the box with a locknut and bushing to a knockout on the meterbox. I was told I needed a grounding bushing and ground the meter. I thought I only needed a grounding bushing when the nipple went thru a hole I made???! any help would be appreciate