I just purchased a motor home with a 30 amp requirement. I am looking for advice on installing a line at home to plug the MH into. I understand the 30 amp circuit in the box and the required end plug hut what type of wire should be run? Is there a limit to the length that should be run?
If it is to be inside wiring you can likely get by with 10-2wg NM-B cable which everyone calls Romex. Try to keep it under 100 feet or you should upsize it to 8-2wg. If there will ever be a 50 amp camper on the horizon you might want to consider putting in 8-3wg so you can upgrade your receptacle when the time comes. This is what we'd do where I live and your local codes may vary. Obviously if the wiring is to be run on the outside of a building or if it needs to be protected from physical damage it would need to be run in the appropriate conduit and if it is to be buried it'll need to be run in a direct burial cable or in PVC conduit.
You need 6 ga minimum for 50 amp - wire size and type depend on length from panel and conduit or direct burial etc. I just put in an Eaton Rv 50/30/20GFCI power box from Home Depot. Nice box. My parking area is 165 feet from sub panel, so a pretty big job.
I used 4 ga in conduit.