Originally Posted by jsk
No I would not plug our unit in to this outlet but have looked at utilizing the wiring. My goal is to get the unit off of the 110 receptacle which has other items on the circuit. Here is the situation.
In my garage there is a 20a AC and 50a welding receptacle both on double pole breakers. We use the AC unit regularly. Both receptacles are 2 wires plus ground. Starting at house panel I am looking at the 50a breaker and wanting to take out the hot wire on one pole and install on the neutral bar. This should give me (1) hot and (1) neutral and ground going to the receptacle. Does this sound reasonable? Am I ok with 50a breaker or do I need to install a 30a? I would prefer to use the 50a.
At the receptacle I would replace the welding receptacle with a 30a RV receptacle. The reason is I have a 30a cord that is long enough to reach camper. Another option is to put in 50a RV receptacle but have to purchase a power cord or get pigtail.
The camper is a 50a unit. Currently I use a pigtail out of camper to a PI 50a surge protector. Out of PI I use a reducer pigtail to 30a. The 30a cord goes to the new receptacle. Currently the 30a cord has a reducer on it taking it to 110. The weak link should be the power cord.
Again the goal is to get camper on dedicated circuit and get off the 110 non dedicated circuit. We fully understand we can not run everything in camper. What we usually run before a trip is (1)AC, fridge, and we check HWH to make sure it is still working. Currently I do these in steps and not at the same time.
The weak links seem to be the receptacle and power cord. Amps can be seen with PI. A typical 50a service is in the future but is a real challenge to pull the wire.
Thoughts are greatly appreciated.
A few comments, which I emboldened on your questions above in red. I am going to use the term 'phase' in strictly layman terms, to help in the understanding.
Everything in your RV is 120 volts, and amps are a different thing. Whether you are connected to a 120/240 split phase 50 amp outlet, a 30 amp single phase outlet, or a 15/20 amp single phase outlet........ EVERYTHING is still wired to only run off of 120 volts.
It's this you have to be sure of, and not ever wire something that will allow 240 volts to your RV. Even a 120/240 split phase outlet that is capable of 240 volts is utilized in such a way that only 120 volts is sent per leg to your RV, which also keeps these legs separate inside the RV so it's all only 120 volts.
You can easily do what you described, utilizing the 3 wires on your double pole 50 amp circuit breaker. However since you have to have 4 wires (2 hots, one neutral, and one ground) to properly utilize a 120/240 volt split phase connection for your RV....then NO you "should" NOT use the 240 volt double pole 50 amp circuit breaker you currently have
, even if you are just connecting it to one pole/side of the circuit breaker. You should replace it with a SINGLE pole
30 amp circuit breaker, which keeps the outlet 120 volts with 3 wires. You then will run the one hot wire from this 30 amp breaker, a neutral, and a ground, to a TT-30R outlet.
Now you can plug into the 30 amp 120 volt outlet, using a 50-30 amp adapter, and although you will be limited to a total of 30 amps for your RV, everything will have power going to it in the RV. You can test, use, or leave on whatever is necessary, as long as you stay below your 30 amp total threshold.
go to this link:
Check out the links, and the welding service tab on the left, which explains how to do the conversion you are wanting to do. He has all kind of great printable pdf files that you can print to make sure you wire the outlets correct and such.
Also, I would recommend perusing the 50 amp and 30 amp tabs too, to get an understanding of exactly how a 50 amp 120/240 volt split phase service actually works. This confuses many campers.
This link below is also another good one to bookmark.