Wiring A 30amp RV Outlet - Ground & Neutral

rhochnadel wrote:
Eighteen years ago National Electric Code required the neutral bus and ground bus be separate, usually a single screw between the two buses would have to be installed to bond the two busses. Your barn panel should have a separate ground bus. Only the house panel should be bonded together. Talk to your electrician, ask him to correct it. You will be glad you did.

Thanks for your help. I have a friend who is a retired electrician and stays up to date and certified in the most current NEC. I reached out to him.
I looked at the sub panel In the barn. Clearly there are single screws at the top of each neutral buss bonding the two together with a strap across the top. One is not dedicated as a ground terminal strip. In fact, the large lug installed on the left neutral buss is the same one the ground wire from the house panel is terminated to.
Everything I read says sub panels need to be grounded separately. There is no separate wire to a ground rod in the sub panel. Looks like an easy fix, but I see no provisions on the panel for grounding (I.e. a ground stud or terminal strip). I can’t figure out how this could have passed inspections Further review seems this work might have been done about 16 years ago. Regardless, it is pretty obvious, unless one of the neutral busses is grounded to the cabinet and I can’t see it.