Just a guess:
Site wiring fault would be the unit not seeing the correct potential from
hot to ground.
If the ground to that receptacle has a poor connection to the common point
ground or the common point ground has a poor connection to the building
entrance and some device dumps some current on the ground, the potential
between hot and ground will drop causing the fault indication.
Just a guess.
-----Original Message-----
From: Nate Burke
Sent: Thursday, February 16, 2017 9:08 AM
To: Animal Farm
Subject: [AFMUG] APC Site Wiring Fault
I have a UPS that I recently installed pulling a 'Site Wiring Fault' for
20 seconds a few times a day, at the exact same time daily. There are no
other local electrical device at the location that I can find turning on
or off at the same time, or that would have this kind of regularity.
There is a smart meter at the location, could the smart meter be doing
some polling that would cause this? I have another Identical UPS off
the same utility HV line, but different transformer and meter, and it
does not have any errors.
Has anyone seen these before and been able to track down a cause? On the
APC forums, one reply was to simply disable the alert, saying otherwise
you'll descend down a never ending rabbit hole of diagnosing and
tweaking your electrical plant.
Nate
