Fpbear II wrote:
I noticed that some appliances were running better when plugged into certain
outlets. I am wondering what could cause the voltage difference. This is
in a room where the previous owner installed four GFCI outlets coming from a
dedicated subpanel. The measurements (with some loads still present) a

Pair 1:
134V outlet A
110V outlet B

Pair 2:
113V outlet C
127V outlet D

I took off the face plates. The two pairs of outlets have a shared neutral,
i.e. one white wire comes down from the wall and goes into both outlets.
The other two wires in each outlet pair have the separate hots.. red wire
goes into the hot in one outlet and black wire goes into the hot in the
other outlet.

I also took off the subpanel cover. Here is a picture with the wires
clearly shown. It looks like each outlet has its own breaker:

http://www.statuaryplace.com/images/insidesubpanel.jpg

The subpanel conduit goes all the way to the main service panel and I'm not
sure where it connects at the service panel. The house was built in 1950 so
the rest of the electrical is pretty old, but it this subpanel appears to be
independent of the old wiring.

I am wondering if it might be a mis-wiring at one of the outlets or
something simple that I can fix myself. I have done a lot of electrical
work at the previous house but I am not familiar with shared neutral
circuits.

Thanks!!


It looks to me like the grounding isn't adequate. Make sure the ground
wire connections in the subpanel and main panel are good and tight.
Also check voltages at the subpanel and main panel.

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