Boomerweps wrote:
Since you can only pull (basically) 30 amps from your home 30 amp supply, your current cables designed for 30 amp (10awg) are sufficient safety wise.
However, you do not mention how long a cable run that is to the street to your RV. There will be some line loss of voltage. The more 50amp 8awg cable used, compared to the 10awg, will result in less line loss. I don't have the link handy but web search "AC line loss calculator" and you will easily find it. You can add the losses up separately for each length of different diameter wire.
This is one of several I like for it's ease of use -
Voltage Drop Calculator. Note that not only is cable gauge directly related to voltage drop but so too is the initial source voltage, meaning if you find your unloaded nominal voltage is 120 vac then even with the run you intend loaded voltage entering your rig will still be within acceptable ranges. However, if your unloaded source voltage is already excessively low, say 110 vac, then obviously once you load the circuit with devices running in your rig that source voltage could drop into a dangerous zone. Check it so you
know what you're dealing with, better still invest in an EMS that will disconnect power to the rig if it drops dangerously low.
