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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > 14-50 Nema converter to 30 AMP female

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chracatoa

Seattle

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Posted: 05/27/19 01:53pm Link  |  Quote  |  Print  |  Notify Moderator

So I just installed a 14-50 Nema outlet to charge my electric vehicle. I believe it's 240v, but as far as I know it pulls it from 2x120v. Can I use an adapter and plug my 30AMP 110v trailer to it? Will I get 240v or 110/120v?


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Chris Bryant

Arden, North Carolina

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Posted: 05/27/19 02:25pm Link  |  Quote  |  Print  |  Notify Moderator

That outlet has two hits, a neutral and a ground. There is 120 volts between each hot and ground, and 240 volts between the hots. The adapter will use one leg of that circuit, for 120 vac. Yes, it will be fine.


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time2roll

Southern California

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Posted: 05/27/19 02:43pm Link  |  Quote  |  Print  |  Notify Moderator

Very common and standard adapter is available at any RV store, amazon and plenty of others.
Thousands are in use right now. The adapter will supply 120 volts to your 30 amp RV just fine.


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RoyB

King George, VA

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Posted: 05/27/19 02:47pm Link  |  Quote  |  Print  |  Notify Moderator

Going by this chart from NO-SHOCK-ZONE you can see what the measurements should be around your 50A connector using a multimeter...

[image]
NOSHOCKZONE image

Using a RV50A (M) to RV30A(F) adapter cord will look like this...
[image]
NOSHOCKZONE Image

Note that only one leg of the HOT1 or HOT2 is used... This will not feed 220VAC to the 30A Trailer. IT will however feed 120VAC at 50AMPS to your 30A Power Distribution Panel but you will be protected by a 30A Breaker if you draw more than 30A's from your appliances...

I have no idea how this would affect any surge protection devices you may have hooked up protecting your 30A Power Distribution Panel...

I guess this all makes sense to you... I would contact a RV Wiring EXPERT if you are unsure about anything... I am NOT an expert in this area... Just reading all of this from the NOSHOCKZONE on the internet...

This will be no different than using the RV50A(M) to 30A(F) adapter Cord connected to the campground pedestals... I do this all the time as when I look at the contacts on the 50A connector they all look like new as compared to the 30A connecters that have black burn marks everywhere haha...

Here is another drawing from NO SHOCK ZONE showing how to wire up the 50A and 30A connectors...

[image]
NOSHOCKZONE image

Here is pictorial of what to measure around a 30A Connector using a multimeter...

[image]
NOSHOCKZONE image

Might be interesting to compare notes with you just have connected up...

Roy Ken
[image]

* This post was last edited 05/27/19 03:21pm by RoyB *   View edit history

chracatoa

Seattle

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Posted: 05/27/19 03:09pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks. I'll buy an adapter and I guess I'll have to find one of my voltmeters.

cavie

Port Charlotte Fl/ Hindsdale MA

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Posted: 05/27/19 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

chracatoa wrote:

So I just installed a 14-50 Nema outlet to charge my electric vehicle. I believe it's 240v, but as far as I know it pulls it from 2x120v. Can I use an adapter and plug my 30AMP 110v trailer to it? Will I get 240v or 110/120v?


50 amp is 120/240 just like at home. 240 L1 to L2. 120 volts L1 to neutral and L2 to neutral just like at home. Yes you can use and RV dog bone to hook up to your 30 amp 120 trailer.


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Reisender

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Posted: 05/28/19 09:59am Link  |  Quote  |  Print  |  Notify Moderator

cavie wrote:

chracatoa wrote:

So I just installed a 14-50 Nema outlet to charge my electric vehicle. I believe it's 240v, but as far as I know it pulls it from 2x120v. Can I use an adapter and plug my 30AMP 110v trailer to it? Will I get 240v or 110/120v?


50 amp is 120/240 just like at home. 240 L1 to L2. 120 volts L1 to neutral and L2 to neutral just like at home. Yes you can use and RV dog bone to hook up to your 30 amp 120 trailer.


Yep. We have two Electric vehicles. We routinely use 14-50 or TT30 receptacles for charging the cars. The 240 volt 14-50 is literally 6 times as fast as the TT30 as the EVSE detects 120 volts on the TT30 and automatically switches to 12 amp max. On the 14-50 it detects 240 and allows 27 amps. We gave both a 14-50 and TT30 on our property.

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