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Open Roads Forum  >  Tech Issues

 > DIY 50 amp to 20 amp pigtail

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wnjj

Cornelius, Oregon

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Posted: 11/11/22 11:40am Link  |  Quote  |  Print  |  Notify Moderator

ktmrfs wrote:

wnjj wrote:

The breakers in the sub panel do not have to add up to the capacity of the supply. Look at your house main panel as an example to see far more than 200A or whatever size panel you have.

Consider too that 50A at 240V is equivalent to 100A at 120V. So you can put several 20A breakers in there and not have an issue even if all were maxed out.

I also see no reason to turn breakers on and off as use them. The 50A breaker at the house will prevent you from overloading the supply.

On final nit pick: You still have a 240V plug in your barn if the RV plug is a 50A one. The RV just uses it as two 50A , 120V circuits.


50A at 240V CAN be UP TO 100A at 120, but could be less, depends on how the two legs are loaded. Each leg is protected to 50A, either leg goes over 50A and a properly installed 50A/240V breaker will trip both legs.

Yeah I left that pesky detail out about balancing them across the legs. As you fill slots in the panel they will alternate so you have to go out of your way to load them all on one side, but your point is taken.

Cummins12V98

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Posted: 11/11/22 06:40pm Link  |  Quote  |  Print  |  Notify Moderator

KnowNuthin wrote:

Cummins12V98 wrote:



I advise 12GA wire and 20A breaker.


Our barn sub-panel is supplied by a 50@ 2-pole breaker in our main house panel… the circuits original purpose was to have a 240v, 50@ welder outlet in the garage.. I had an electrician repurpose that service to our 50@ RV plug in the barn (no longer a 240v outlet in the garage)…

I currently have one 50@ and 2-20@ breakers in the sub-panel… when we plug in the RV we shut off the. 20a breakers and vice-versa…

The spousal unit is an electrical engineer and as such has assured me EVERYTHING electrical is underrated… I.e. we have more than 50@ going into the barn panel and each of the breakers will handle more than their rated capacity (but will trip in the event of an short/overload)… at least that’s what I heard… when she gets going I understand about every third word, the rest is electrical-eze…

Chances are very good I won’t ever run each of the circuits up to their rated capacity… but I’m the worrying kind…

My intention was to replace one of the existing 20a breakers with a 15a then add a second 15a breaker…. Which would give me 20a + 15a + 15a = 50a (plus the dedicated 50a RV outlet)

Yes? No? Other suggestions?


You actually have two 50A circuits available as 100A total capacity. Add another 20A and forget it.


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CharlesinGA

South of Atlanta, Georgia

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Posted: 11/12/22 09:25pm Link  |  Quote  |  Print  |  Notify Moderator

toedtoes wrote:

Would this work for you? It has a built in circuit breaker for added protection:
50amp to 4x 15/20amp adapter


For the price, you cannot buy the stuff to make this and it is EXACTLY what the OP needs.

[image]

Charles


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time2roll

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Posted: 11/12/22 10:09pm Link  |  Quote  |  Print  |  Notify Moderator

CharlesinGA wrote:

For the price, you cannot buy the stuff to make this and it is EXACTLY what the OP needs.
I was about to recommend a $10 power strip from WM with a breaker but this item is perfect. Even looks semi weather resistant.


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wa8yxm

Davison Michigan (East of Flint)

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Posted: 11/13/22 08:14am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

CharlesinGA wrote:

For the price, you cannot buy the stuff to make this and it is EXACTLY what the OP needs.
I was about to recommend a $10 power strip from WM with a breaker but this item is perfect. Even looks semi weather resistant.


Fully agree. Exactly what he's looking for and you can't beat the price unless you have a very well stocked "Spares" box. The plug alone is close to the 10 dollar price.


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pianotuna

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Posted: 11/13/22 11:12am Link  |  Quote  |  Print  |  Notify Moderator

CharlesinGA,


Nice find!


Regards, Don
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enblethen

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Posted: 11/13/22 11:46am Link  |  Quote  |  Print  |  Notify Moderator

This looks like a better product then building one. At least it has some overcurrent protection.
Surieen Adapter


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toedtoes

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Posted: 11/14/22 01:44pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

CharlesinGA,


Nice find!


Yep! Great find! Wish I had found it! [emoticon] [emoticon]


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KnowNuthin

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Posted: 11/14/22 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

[emoticon]


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Dutch_12078

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Posted: 11/15/22 10:49am Link  |  Quote  |  Print  |  Notify Moderator

Heh! Five pages of posts for a question that was answered on the first page... [emoticon]


Dutch
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