map40 wrote:
Amazon seels an adapter like that with a 30 and a 15 male plugs, but you have the GFCI problem. A friend of mine simply took off the ground of the 15 amp so it would not trip the GFCI. Not a smart idea.
I have never found a campground wired with the 15 and the 30 on the same 30 amp line, but I have heard of people that have seen them. It is against code...
Cutting off the ground is not a good idea for many reasons, not the least of which is that it won't prevent the GFCI from tripping. You'd still have an imbalance between the hot and the neutral return currents as the neutral is still common between the two sockets.
Wiring the 15A receptacle from the 30A feed would be up to code, to the best of my knowledge, provided there's a suitable breaker or fuse protecting the 15A socket from overcurrent.