length of 30 amp line

Anywhere we've been in the US I've never run out more than 50' but here in the Ontario provincial park system having to run out at least 75' isn't unusual at all, even 100' is quite common. :E I carry ~ 140' of 10 gauge cable and last year used it all at Inverhuron Provincial Park where really long runs are the norm. When push comes to shove no one needs to pull a full 30 amps, in fact we typically only draw a few amps to power the trailer itself and restrict our maximum draw to not much more than 15 amps total by only running one high draw device at a time. For example, if we want to use the microwave oven and the A/C happens to be on I'll either turn it off completely or dial back the thermostat so only the A/C fan motor is running. During cold weather when we may be using an electric heater to augment the furnace we'll turn it off briefly if my wife wants to use her hair dryer. Long runs are so typical here it's also the reason I usually run our water heater on gas only and don't bother with the electric heating option unless we happen to get lucky and are on a site that only requires a 25' run to the power post, which doesn't happen often. Restrict your maximum draw, check your unloaded source voltage before plugging in, and monitor the voltage with the circuit under your expected maximum load to ensure incoming source voltage doesn't all below ~ 105 vac and you'll be surprised at just how far out you can run your 10 gauge main service cable. OR better still, protect your trailer's electrical system with a Progressive Industries EMS-HW30C surge protector that will prevent campground power source anomalies from damaging your trailer, including excessively low voltage by cutting it off completely when it drops below 104 vac.