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 > Reverse Polarity code When Plugging in at Home

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Lakejumper

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Posted: 09/28/20 02:19am Link  |  Quote  |  Print  |  Notify Moderator

In the past I have plugged my RV in directly to my 30 receptacle in the garage, without any issues. Today a friend who is visiting plugged into my 30 amp plug, but placed a surge protector in the middle of the power cords and got a Reverse Polarity error code. Why is this happening?


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MEXICOWANDERER

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Posted: 09/28/20 03:51am Link  |  Quote  |  Print  |  Notify Moderator

Whomever wired his EMS did it bass-ackwards. Anything reconnectable on the incoming shore power from plug to his breaker panel is reconnectable. But it is commonly it's in the umbilical cord.

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Posted: 09/28/20 04:49am Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:

Whomever wired his EMS did it bass-ackwards. Anything reconnectable on the incoming shore power from plug to his breaker panel is reconnectable. But it is commonly it's in the umbilical cord.


Or maybe the 30 receptacle in the garage is wired wrong and it always had a problem but was never checked.


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Posted: 09/28/20 06:28am Link  |  Quote  |  Print  |  Notify Moderator

TenOC wrote:

MEXICOWANDERER wrote:

Whomever wired his EMS did it bass-ackwards. Anything reconnectable on the incoming shore power from plug to his breaker panel is reconnectable. But it is commonly it's in the umbilical cord.


Or maybe the 30 receptacle in the garage is wired wrong and it always had a problem but was never checked.


This is what I'd check first. Getting the Hot and Neutral swapped when wiring the plug is very easy to do. In the old days before the 3rd wire ground was introduced it usually didn't matter how you wired the plugs. But with the 3rd wire ground and with a lot of the newer electronics it does matter and can make a difference (it actually makes a difference on 2-wire connections too which is why most plugs can only plug in one way with the larger blade on one side of the plug). I always use a tester on any new circuit or plug I install just to make sure I did it right.

* This post was edited 09/28/20 06:35am by bob_nestor *

BurbMan

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Posted: 09/28/20 06:35am Link  |  Quote  |  Print  |  Notify Moderator

Agreed, if OP was not using a polarity checker the garage outlet has likely been wrong from the get go and he never knew it.


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Posted: 09/28/20 07:13am Link  |  Quote  |  Print  |  Notify Moderator

Call an electrician and have them check the wiring.


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Posted: 09/28/20 07:36am Link  |  Quote  |  Print  |  Notify Moderator

wildtoad wrote:

Call an electrician and have them check the wiring.

This can be done before calling an electrician.

Go to a big box hardware store and buy a no-contact voltage tester. They are not expensive. That will tell you exactly which slot on your 30 amp outlet is hot. You can then tell if the outlet is wired backwards. With the round slot at the top, the hot slot should be lower left.

[image]


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Dave H M

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Posted: 09/28/20 08:20am Link  |  Quote  |  Print  |  Notify Moderator

Bpbbo, If you hare some elcheapo HF volt ohm meters laying around already, won't they suffice for the testing?

BB_TX

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Posted: 09/28/20 08:22am Link  |  Quote  |  Print  |  Notify Moderator

Bobbo wrote:

wildtoad wrote:

Call an electrician and have them check the wiring.

This can be done before calling an electrician.

Go to a big box hardware store and buy a no-contact voltage tester. They are not expensive. That will tell you exactly which slot on your 30 amp outlet is hot. You can then tell if the outlet is wired backwards. With the round slot at the top, the hot slot should be lower left.

[image]


This is the best answer. And that tester is handy to have around any way. Here is how it should be wired.

http://www.myrv.us/electric/

* This post was edited 09/28/20 08:28am by BB_TX *

K Charles

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Posted: 09/28/20 08:23am Link  |  Quote  |  Print  |  Notify Moderator

A volt meter stuck in the long spot and the round hold should be zero.





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