On Tue, 29 Dec 2015 19:53:01 -0600, IGot2P wrote:


Okay, the feeder wire is #2 if I am reading the writing on the wire
correctly.

I shut all of the power down and loosened the neutral in the main box in
the house and then reset it and tightened it up very tight. It did not
appear to be loose or corroded before or after I did this. I also
checked once again that the the hots coming out of the 100 amp breaker
in the main box in the house were tight and they were.

Now to the box in the shop. I attempted to tighten the hots but they
were already as tight as they would go. I then loosened the neutral,
checked for corrosion (there was none) and re-tightened it.

After doing the above I checked the voltages again and had the same 125
and 117 as I originally did so no joy.

Then I shut all of the breakers off in the shop panel including the main
100 amp breaker and checked the voltages again. Now things had changed
and I had 122v and 120v!

To this layman it appears that it is just difference in the load on the
two legs that is making the difference but now that the difference is
down to two (2) volts I think that is close enough. I suppose that I
could move some of the load from one leg to the other and even things
out somewhat. Of course it would depend upon what was turned on at any
given time.

Thanks to all who helped,

Don

You must have some fairly heavy load in there.
Yes, move some of the heavier loads to the opposite leg. Try to balance
them. If you have a clamp around amp meter, put it on each main wire.

Do you have a green wire coming from the house? If not, you should have
a ground rod, and I believe I read that anything over 100' should have
one anyhow. When weather allows, I'd put in two ground rods and connect
them with #6 bare copper wire.