all breakers blowing

A hot breaker means either a bad breaker a bad connection or some serous error

I would measure voltages Leg to leg. leg to neutral and leg to ground Both legs) one thing that can blow all breakers. and most of your expensive electronics, is over voltage.

Think of voltage like persure in a water line.. You push 40 PSI and a specific nozzle delivers 2GPM.. What do you think happens if you push 80 PSI (4GPM?) Well amps are like GPM.. only in the case of overvoltage it can go much higher

Let us now what is found!

Update

Main breaker is quite hot to the touch--and now will not reset.

I'm suggesting a mobile repair person.

Sure sounds like a neutral issue in the rig including shore power cord.
Turn off power to rig, closely inspect the 120/240 distribution panel for damaged conductors.

LouLawrence,

Unfortunately I don't have access to a clamp on amp device.

What I do have is a kill-a-watt meter.

Unfortunately the main shore power plug has been abused in the past due to a disconnected neutral (lawn mower event), which was fixed last summer--but the melted plug was not replaced. The part that melted was a 15 to 50 dogbone if I remember correctly. It melted at the 15 amp end due to the absence of the neutral.


The shore power breaker is not tripping at the house.

Voltage at 114 under load tells me the cord to the house is ok.

You might start my having the main 50 amp breakers (2 breakers tied together) turned on and all other breakers turned off. Then, use the individual breakers to turn things on 1 at a time. Start with the A/C and watch the amp spike and how long it lasts. I assume you have some way to monitor your total amps in use.
Hopefully you can isolate where the excess amp draw is coming from. If this is at a campground and the campground has a good 50 amp plug (same dual 50 amp breaker tied together) and it is not tripping then the issue is in your power cord, breaker box or one of the appliances we hope to identify.

Very hard to believe "all" breakers are tripping. Sounds like the friend is not really aware of what is happening and getting vague long distance info like that is not very helpful in guessing a cause. A mobile RV repair should be called right away before the friend starts trying to troubleshoot it.

They need to get a qualified electrician over to diagnose. Seems like a fire is a real possibility if all breakers are tripping. Probably a simple fix but needs done right.

Not an electrician.... but if everything is tripping, I'd be checking to make sure all wires, especially grounds, are tight and clean. Start with the power pedestal and work in.

What initially caused my TT GFC to trip was an over load of the system when I fired up a 3000 Watt portable generator at remote undeveloped campsite. My bad but a learning experience. Rollin, Rollin, Rollin.