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So we're reading 400A shop 200A house ,and trailer all off one service ?

The problem apparently being return paths to the serving Xformer , which is where? proximal or distal to these structures?

My Q's would be how many earthed neutrals exist?

How many metallic systems are common? IE> water, cable coax, phone, etc

~CS~
 

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Thanks, it really does make a difference reading it :thumbsup:

I'd focus on the incoming service. Either a bad Tx, or a neighbour is passing neutral current to this service.

Measure the current on the ground wire, I think you'll see current. If it stays there when you shut off the main, you know it's from someone else.
If you don't find anything there, then do the same with the neutral on the service.

*edit* adding a ground rod at the trailer will only hide the problem, but will fix the tingle problem
:thumbsup:

^^^this phenomenon happens more than most realize ..... apt advise starting with the concept of an internal Vs. external malady ~CS~
 
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