Dryer outlet - Not used

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vmlopez
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Dryer outlet - Not used

Post by vmlopez » Tue Apr 09, 2019 8:01 am

Hi guys,
I have a dryer outlet that we never used when the house was built. We are in the process of buying an RV that has 30 amp/120 power and we were thinking of using the outlet but this outlet is rated as 30 amp 125/250V. I was thinking of just replacing the old dryer out with an 30 amp 120 RV outlet. Doing this will allow us to plug in our RV for power while we are at home. Of course I wold move the outlet to the outside of our house from what I can see there is plenty of wire to do this.

attached is a picture of the outlet.

My question is - how to I go about changing or converting the OLD dryer outlet to an RV outlet(30 amp/120) ?
again - thanks in advance for your comments.
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Aaron
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Re: Dryer outlet - Not used

Post by Aaron » Tue Apr 09, 2019 8:36 am

The issue is that dryer receptacle is the old-school type that has no neutral, it only has ground. It was for older dryers without any electronics. Today's 240-volt dryer receptacles have 4 prongs: two for split-phase power, a neutral, and a ground.

Modern RVs are the same, they have a cord with a 4-prong plug at the end of it. The plug is either for a 240V 30A or 50A receptacle, depending on the subpanel of the RV.

So, unfortunately, you're looking at new wire (for a neutral conductor) and a new receptacle. You may be able to reuse the double-pole breaker you already have, however.

You will also need to use a weatherproof "in -use" box on the exterior of your home to house the 240V receptacle your RV will plug into.

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emtnut
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Re: Dryer outlet - Not used

Post by emtnut » Tue Apr 09, 2019 9:12 am

I interpret this different.

The NEMA 10 series used the neutral as a ground.

A 30A RV receptacle is 30A 120V.

So you 'may' be able to use the existing wiring IF it has a ground conductor. If not, you will need new cable.

You could re-purpose the 240V breaker, but you would only wire in 1 hot.
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Aaron
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Re: Dryer outlet - Not used

Post by Aaron » Tue Apr 09, 2019 12:21 pm

Yes, I stand corrected. There was no EGC.

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Re: Dryer outlet - Not used

Post by emtnut » Tue Apr 09, 2019 6:14 pm

Aaron wrote:
Tue Apr 09, 2019 12:21 pm
Yes, I stand corrected. There was no EGC.
Yeah, but I doubt that the existing cable has a ground wire, so he will probably need new cable for the RV outlet anyways.
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Shannon
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Re: Dryer outlet - Not used

Post by Shannon » Tue Apr 09, 2019 8:03 pm

Are 50 amp RV receptacles 120V also? Sorry to interrupt .
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Re: Dryer outlet - Not used

Post by Aaron » Wed Apr 10, 2019 6:26 am

No, they're 240V. They use NEMA 14-50 receptacles, the same as an electric range typically.

vmlopez
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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 7:07 am

Hi Guys,
I removed the cover and this shows that it has 4 wires: Attached is a snap shot.
1- Ground
1-Black
1-White
1-Red


Please let me know if you need any more info and what would be my next step:

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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 7:15 am

Guys,
Not sure that I added the attachments..

Please confirm..
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Shannon
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Re: Dryer outlet - Not used

Post by Shannon » Wed Apr 10, 2019 7:35 am

Aaron wrote:
Wed Apr 10, 2019 6:26 am
No, they're 240V. They use NEMA 14-50 receptacles, the same as an electric range typically.
Hmm interesting I actually thought that those 30 and 50 amp RV plugs where both 240V. So next question what is running 240V in RVs? Roof top air conditioning is all I can think that may? But I've owned Rvs with 30 amp plugs ,with air so maybe some are 120V in those cases?
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Re: Dryer outlet - Not used

Post by Aaron » Wed Apr 10, 2019 7:53 am

Shannon wrote:
Wed Apr 10, 2019 7:35 am
Hmm interesting I actually thought that those 30 and 50 amp RV plugs where both 240V. So next question what is running 240V in RVs? Roof top air conditioning is all I can think that may? But I've owned Rvs with 30 amp plugs ,with air so maybe some are 120V in those cases?
Well not so much 240V appliances per se, it's really just more for a safe balance of 120V loads across two legs. Most RV appliances are 120V, though a large RV could have a 240V A/C.

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Re: Dryer outlet - Not used

Post by Aaron » Wed Apr 10, 2019 8:02 am

vmlopez wrote:
Wed Apr 10, 2019 7:07 am
Hi Guys,
I removed the cover and this shows that it has 4 wires: Attached is a snap shot.
Oh, you're in luck! Yes, you have 4-conductor cable. So you could easily upgrade that receptacle to a modern one with a ground pin socket, and reuse that cable.

Now look at the cable jacket itself... it will have printing on the jacket, or it may be molded into the jacket (it's often hard to read). I'm guessing it's 10/3 with ground, as that is typical for a clothes dryer circuit which is 30 amps.

In that case, the modern receptacle you'd use for an RV would be a NEMA 14-30 (or a NEMA L14-30 for a twist-lock type plug).

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Re: Dryer outlet - Not used

Post by Aaron » Wed Apr 10, 2019 9:28 am

emtnut wrote:
Tue Apr 09, 2019 6:14 pm
Yeah, but I doubt that the existing cable has a ground wire, so he will probably need new cable for the RV outlet anyways.
Doubting Thomas. :lol:

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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 11:24 am

Hi Guys,
I just checked and its pretty thick compared to the other wires. It has on it, 10-3 with a ground.
so Basically I need to replace the receptacle with a new one -that you have listed -
'a NEMA 14-30 (or a NEMA L14-30 for a twist-lock type plug)' ?

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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 11:39 am

Guys,
Checking Amazon, there are a slew of them along with the boxes... Not quiet sure which ones to use. Can you or someone recommend which ones to buy and the type of box ?

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Re: Dryer outlet - Not used

Post by emtnut » Wed Apr 10, 2019 12:38 pm

vmlopez wrote:
Wed Apr 10, 2019 11:24 am
Hi Guys,
I just checked and its pretty thick compared to the other wires. It has on it, 10-3 with a ground.
so Basically I need to replace the receptacle with a new one -that you have listed -
'a NEMA 14-30 (or a NEMA L14-30 for a twist-lock type plug)' ?
For an RV trailer, you need a NEMA TT-30 receptacle.
You can verify the plug on the trailer, but this is what all the ones I've seen use.

When wiring this, you won't use the RED wire in your cable (just cap it off)

https://www.homedepot.com/p/Leviton-30- ... /300324450

https://www.amazon.com/Aweking-Receptac ... B07D5TGZXY
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Re: Dryer outlet - Not used

Post by emtnut » Wed Apr 10, 2019 12:40 pm

Aaron wrote:
Wed Apr 10, 2019 9:28 am
emtnut wrote:
Tue Apr 09, 2019 6:14 pm
Yeah, but I doubt that the existing cable has a ground wire, so he will probably need new cable for the RV outlet anyways.
Doubting Thomas. :lol:
Yeah yeah ... What were the chances :mrgreen:
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vmlopez
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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 1:09 pm

Thanks for your input - Very much appreciated..

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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 1:16 pm

And reminding me to cap the red wire :)

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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 6:36 pm

Oh Yes. Do I cap both ends of the Red Wire ? :)

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Aaron
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Re: Dryer outlet - Not used

Post by Aaron » Wed Apr 10, 2019 8:26 pm

vmlopez wrote:
Wed Apr 10, 2019 6:36 pm
Oh Yes. Do I cap both ends of the Red Wire ? :)
Yes. As it turns out you only needed three conductors after all with that TT-30 type receptacle.

When I need to, I like to put little caps at the end of unused conductors. Like the little blue ones. For #10 you may need an orange.

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Re: Dryer outlet - Not used

Post by vmlopez » Wed Apr 10, 2019 9:19 pm

Thanks

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Re: Dryer outlet - Not used

Post by emtnut » Thu Apr 11, 2019 5:16 am

vmlopez wrote:
Wed Apr 10, 2019 6:36 pm
Oh Yes. Do I cap both ends of the Red Wire ? :)
Yep ! At the panel, you currently have (should have) a 30A double pole breaker with a black and red wire.
Ideally, you would change this out to a 30A single pole breaker, and just use the black wire (white and ground connected to the neutral and ground bars) , red capped off.

You also can just remove the red wire from the double pole and cap it. Make sure you mark on your panel that is is now a 120V RV circuit.

At the receptacle, cap the red, and connect the blk wht and green as per a normal 120V feed.

As Aaron said, use a small wirenut for the #10 wire.
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Re: Dryer outlet - Not used

Post by emtnut » Thu Apr 11, 2019 5:20 am

Shannon wrote:
Wed Apr 10, 2019 7:35 am
Aaron wrote:
Wed Apr 10, 2019 6:26 am
No, they're 240V. They use NEMA 14-50 receptacles, the same as an electric range typically.
Hmm interesting I actually thought that those 30 and 50 amp RV plugs where both 240V. So next question what is running 240V in RVs? Roof top air conditioning is all I can think that may? But I've owned Rvs with 30 amp plugs ,with air so maybe some are 120V in those cases?
The 30A is 120Volts ... so 3,600 watts available
The 50A is 240Volts ... so 12,000 watts available.

I've never worked on a trailer with 50A service, but I think they have all 120V loads ... mainly so that if you are at a park with only 30A 120V service, you can use an adapter and still use 1 of the AC units.
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Re: Dryer outlet - Not used

Post by Aaron » Thu Apr 11, 2019 1:17 pm

emtnut wrote:
Thu Apr 11, 2019 5:20 am
I've never worked on a trailer with 50A service, but I think they have all 120V loads ... mainly so that if you are at a park with only 30A 120V service, you can use an adapter and still use 1 of the AC units.
My mom and her husband used to have a double-wide, that one had the NEMA 14-50 plugin. I installed the receptacle on the side of my sister's house when they parked it there for a month. That was back in like 2002 or so.

I think it had a 240V air-conditioner, and maybe the heater was too. But all the appliances and everything else inside was 120V.

Many of the more modern RV parks have 240 plug-ins now I think.

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