Apr-26-2013 05:21 AM
May-01-2013 08:07 AM
Apr-29-2013 12:02 PM
PUCampin wrote:tropical36 wrote:PUCampin wrote:
Here is a bit of food for thought. On a 30A service limit it is not likely to matter, but if the RV is wired with any Multi Wire Branch Circuits, there is the potential to overload the neutral due to both sides now being fed from the same leg. 🙂
Will he not have a 30 breaker on the pedestal?
A 50A RV panel is similar to a home panel. 2 hot legs with 220 between them (single phase 220V) comes in to the panel. The neutral is centered between them (spliting the phase) giving 2 legs of 120V hot to neutral out of phase from each other for a total of 100A available at 120V. Often in homes, builders will use multi-wire branch circuits, which feeds 2 different circuits using the 2 hot legs and sharing the neutral wire. This works because the 2 hot legs are out of phase and thus neutral only carries the difference of the current. (Say 10A on 1, 12A on the other, the neutral carries 2A)
50A RVs may or may not have some of these MWBC, but since they save money in materials it is certainly possible. The problem arrises with the 50A-30A adapter. It feeds both sides of the 50A RV panel 120V from one leg of 120V (the 30A pedestal). So now instead of having 2 sides of 120V out of phase, both sides are on the same phase, and instead of carrying the difference of the current, the neutral carries the sum of the current (10A on 1 and 12A on the other, the neutral carries 22A), on wire that is likely 14AWG NM rated for 15A, while not exceeding the 30A breaker on the pedestal.
In all reality, I have never heard of this actually causing a problem, and it is unlikely, just something I was thinking about as I read the thread. 🙂
Apr-29-2013 11:55 AM
Apr-29-2013 08:35 AM
tropical36 wrote:PUCampin wrote:
Here is a bit of food for thought. On a 30A service limit it is not likely to matter, but if the RV is wired with any Multi Wire Branch Circuits, there is the potential to overload the neutral due to both sides now being fed from the same leg. 🙂
Will he not have a 30 breaker on the pedestal?
Apr-27-2013 05:45 AM
hershey wrote:
We had a problem with our TV overloading the 30 amp service. When the AC was on and we tried to watch TV at the same time it would overload the circuit. We found a simple fix for the problem. We just converted the TV to run on propane and that solved the problem.
Apr-26-2013 02:11 PM
Apr-26-2013 01:10 PM
Apr-26-2013 11:51 AM
Apr-26-2013 11:32 AM
PUCampin wrote:
Here is a bit of food for thought. On a 30A service limit it is not likely to matter, but if the RV is wired with any Multi Wire Branch Circuits, there is the potential to overload the neutral due to both sides now being fed from the same leg. 🙂
Apr-26-2013 09:49 AM
Apr-26-2013 09:33 AM
Apr-26-2013 08:25 AM
Apr-26-2013 08:15 AM
Apr-26-2013 07:53 AM