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Old 02-13-2016, 08:48 AM   #1
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50 amp post for rv port

Don't remember how to wire up a 50 post. Do not want 220 on it , but what do I wire to get 50amp, 110v supply. Help, the shocking Muffin Man.
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Old 02-13-2016, 08:50 AM   #2
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Here's a link to some previous posts that explain it.

https://www.google.com/search?q=Wiri...com&gws_rd=ssl
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Old 02-13-2016, 09:04 AM   #3
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Try this web site It explains everything...

RV Electric

Good luck
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Old 02-13-2016, 09:09 AM   #4
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Here https://onedrive.live.com/?id=AE67FF...67FFF392766057 are documents for both 30 amp and 50 amp service wiring.


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Old 02-13-2016, 09:16 AM   #5
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Quote:
Originally Posted by studmuffin View Post
Don't remember how to wire up a 50 post. Do not want 220 on it , but what do I wire to get 50amp, 110v supply. Help, the shocking Muffin Man.
There's no such thing as a 120V/50amp plug for RVs. It's either 120V/30amp or 240V/50amp. Which do you really need?
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Old 02-13-2016, 05:16 PM   #6
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Don't remember how to wire up a 50 post. Do not want 220 on it , but what do I wire to get 50amp, 110v supply. Help, the shocking Muffin Man.

Ok if you just want 120 volts only then you want single phase. Dual phase will give you 220 volts. That means you use only one breaker to supply power to the outlet. You will not have the full amount of currant of 50 amps per side. You will be lucky to safely pull about 25 amps. On single phase when you touch the two hot you will show 110 volts. I know people will come in and jump on me for this but oh well. At your plugin put a jumper from one hot side to the other.
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Old 02-13-2016, 05:24 PM   #7
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Ok if you just want 120 volts only then you want single phase. Dual phase will give you 220 volts. That means you use only one breaker to supply power to the outlet. You will not have the full amount of currant of 50 amps per side. You will be lucky to safely pull about 25 amps. On single phase when you touch the two hot you will show 110 volts. I know people will come in and jump on me for this but oh well. At your plugin put a jumper from one hot side to the other.
What you say will work but will deliver whatever the breaker will deliver.

FWIW The OP is either after something special or clueless about what he wants. What he needs is 120/240 VAC normal house power.
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Old 02-13-2016, 05:29 PM   #8
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FWIW The OP is either after something special or clueless about what he wants. What he needs is 120/240 VAC normal house power.
According to his profile (not in his signature) he has a 2013 Tiffin Breeze. Which uses 50amp service according to the brochure I found. What I think he means is that he doesn't have anything in the coach that uses 240V, so he only needs 120V. But that's not possible with a 50 amp hookup, they're 240/120 by design.
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Old 02-13-2016, 06:44 PM   #9
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Don't remember how to wire up a 50 post. Do not want 220 on it , but what do I wire to get 50amp, 110v supply. Help, the shocking Muffin Man.

I would recommend hiring a "Qualified", licensed electrician to do the job.


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Old 02-13-2016, 06:58 PM   #10
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Ok if you just want 120 volts only then you want single phase. Dual phase will give you 220 volts. That means you use only one breaker to supply power to the outlet. You will not have the full amount of currant of 50 amps per side. You will be lucky to safely pull about 25 amps. On single phase when you touch the two hot you will show 110 volts. I know people will come in and jump on me for this but oh well. At your plugin put a jumper from one hot side to the other.

Quote:
Originally Posted by nothermark View Post
What you say will work but will deliver whatever the breaker will deliver.

FWIW The OP is either after something special or clueless about what he wants. What he needs is 120/240 VAC normal house power.
Neither of these are correct and will generate lots of sparks if attempted.

A standard 50 amp RV outlet is nothing special. It is actually 2 50 amp 120vac circuits out of phase from each other. Meaning that either hot to neutral is 120vac, hot to hot is 240vac. Each circuit is protected by a 50 amp breaker called a double port or ganged breaker. This configuration provides a maximum of 12000 watts. The correct terminology is 120/240vac 50 amp two or split phase. Exactly the same as provided to most sticks and bricks homes except a home is a 200 amp service.

The reference above http://www.myrv.us/electric/Pg/50amp_Service.htm explains the connections, wire sizes, and boxes with pictures and descriptions.


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Old 02-13-2016, 07:04 PM   #11
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Go with post #3 and 10.
I fear the others will lead you to a not so good outcome.
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Old 02-14-2016, 09:09 AM   #12
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Actually the join the two 120 V hots in parallel is the dogbone adaptor for plugging a 50 Amp cord into a 30 Amp socket. The only thing that will not work is any 240 VAC appliance. There are few motor homes with 240 VAC appliances. I suspect that is why.

If you need an explanation of why it works it is simple. 120/240 VAC split phase is a center tapped transformer at the pole with the neutral grounded. That carries through the system. Most loads are tapped between neutral and one of the 120 VAC sides. For 240 VAC the load is connected hot to hot with neutral not connected to the load (but often wired to the terminal box). With a 50 to 30 Amp adapter the two hots are connected together to go to the load and fed from one hot from the distribution panel. No arcs, no sparks, 120 VAC hot to neutral for all loads. Draw if out if it does not make sense to you. If you cannot draw it out keep away from electric power. ;-)
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Old 02-14-2016, 11:05 AM   #13
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They make rv posts for home installation and they may be available at places like home depot.

If not understanding of how they ate wired please hire a licensed electrician and pull a permit to be sure it is installed per code.

Buy the post or pedestal yourself and take it with you to get the permit.

Show it to the folks and they will tell you what type of drawings if any are needed as usually a simple sketch of where the panel is and where the device goes will do.

Showing it to inspector not usually needed but here they can discuss what is needed and possibly share names of qualified contractors as well as telling you what to expect in cost.

The pedestal is not too expensive but the wire is not too cheap.

You will need breakers as well.

The inspector will confirm the pedestal is installed to code so yiu will be good.
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Old 02-14-2016, 04:10 PM   #14
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Quote:
Originally Posted by nothermark View Post
Actually the join the two 120 V hots in parallel is the dogbone adaptor for plugging a 50 Amp cord into a 30 Amp socket. The only thing that will not work is any 240 VAC appliance. There are few motor homes with 240 VAC appliances. I suspect that is why.

If you need an explanation of why it works it is simple. 120/240 VAC split phase is a center tapped transformer at the pole with the neutral grounded. That carries through the system. Most loads are tapped between neutral and one of the 120 VAC sides. For 240 VAC the load is connected hot to hot with neutral not connected to the load (but often wired to the terminal box). With a 50 to 30 Amp adapter the two hots are connected together to go to the load and fed from one hot from the distribution panel. No arcs, no sparks, 120 VAC hot to neutral for all loads. Draw if out if it does not make sense to you. If you cannot draw it out keep away from electric power. ;-)

Your description of 120/240 split phase service in correct. However, your description of a 50 to 30 amp dog bone is somewhat mis-leading.

Each of the load side hots (50 amp outlet) are tied together and connected to the 1 incoming hot (30 amp plug). This provides 120vac to both 50 amp hots but does not provide the 240vac hot to hot voltage.

Just attempting to clarify this as many do not understand and mis-information can lead to possibly deadly results.


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