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Old 09-17-2018, 12:39 PM   #1
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50 amp plug at our S&B shows reverse polarity on my Progressive Industries EMS.

Electrician says the outlet is wired correctly. I think two wires are switched. I just canít find anything on which two and how to correct the issue. I took a chance and plugged in without the EMS. Every plug inside showed proper power using a plugin tester. Any help is appreciated.
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Old 09-17-2018, 12:49 PM   #2
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I understand , reversed polarity ( hot neutral) on a 30 amp RV plug , but this is the first I've heard about it on a 50 amp plug .
Do you have this test diagram ?
Did the electrician do a meter test like this or was he just going by wiring color?
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Old 09-17-2018, 12:49 PM   #3
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Quote:
Originally Posted by cochise1949 View Post
Electrician says the outlet is wired correctly. I think two wires are switched. I just canít find anything on which two and how to correct the issue. I took a chance and plugged in without the EMS. Every plug inside showed proper power using a plugin tester. Any help is appreciated.
If you have a voltmeter and know how to use it, and presuming the outlet is a NEMA 14-50....

You should measure 240V between the "outside" vertical slots, and 120V between the lower, center vertical slot and each of the other outside slots, and ZERO volts between the U-ground (at the top) and the neutral (the lower, center slot). If you measure anything else, it's wired wrong.


edit ps: Skip's diagram shows this nicely!
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Old 09-17-2018, 01:21 PM   #4
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A tie for, the timing of our posts ; Solo_RV_Guy ; hard to post new info when that happens.
My typing is so slow , there can be several posts while I'm typing.
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Old 09-17-2018, 01:21 PM   #5
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Does it show reverse polarity when plugged in at a campground?
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Old 09-17-2018, 01:59 PM   #6
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Does it show reverse polarity when plugged in at a campground?
Good question.

And is thus a new home pedestal setup or existing and has been ok previously?
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Old 09-17-2018, 02:28 PM   #7
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I'm just wondering if one of the current transducers was turned backwards during the install of the EMS....with the arrow pointing away from the contractor instead of towards it
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Old 09-18-2018, 11:40 AM   #8
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Quote:
Originally Posted by Skip426 View Post
I understand , reversed polarity ( hot neutral) on a 30 amp RV plug , but this is the first I've heard about it on a 50 amp plug .

Do you have this test diagram ?

Did the electrician do a meter test like this or was he just going by wiring color?


The plug tests exactly as described in your diagram. I gave the electrician this diagram before he started.
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Old 09-18-2018, 11:42 AM   #9
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Quote:
Originally Posted by Solo_RV_Guy View Post
If you have a voltmeter and know how to use it, and presuming the outlet is a NEMA 14-50....

You should measure 240V between the "outside" vertical slots, and 120V between the lower, center vertical slot and each of the other outside slots, and ZERO volts between the U-ground (at the top) and the neutral (the lower, center slot). If you measure anything else, it's wired wrong.


edit ps: Skip's diagram shows this nicely!


Yep...everything measures as in the diagram.
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Old 09-18-2018, 11:43 AM   #10
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Quote:
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Does it show reverse polarity when plugged in at a campground?


We are at a park in Reno now. EMS showing no errors.
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Old 09-18-2018, 11:44 AM   #11
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Originally Posted by vsheetz View Post
Good question.

And is thus a new home pedestal setup or existing and has been ok previously?


New setup.
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Old 09-18-2018, 01:12 PM   #12
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That previous park has problems in my opinion.
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Old 09-18-2018, 01:24 PM   #13
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Instead of just testing .....
Remove the outlet and visually verify where each wire goes


RED to one side terminal
BLACK to opposite side terminal
WHITE to bottom 'slot' terminal
GREEN/BARE to top 'u' shaped terminal

Visually verify the wiring .
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Old 09-18-2018, 03:08 PM   #14
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If you have 0 volts at ground to neutral, there is nothing wrong with the wiring.
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