First off I would never use a plug GFCI. Get your self a GFCI breaker and put it on that whole circuit. The plug GFCI can trip like an arc fault as well for no reason and for this reason they are junk.
If the GFCI breaker trips you do have a direct fault and need to source it out.
Have a second breaker that you can switch to if you have the first to go down and when you to get the alarm text you can just swap plugs to eliminate the problem or run your back up off the second circuit.
Cheers Don.
Thanks Don and others for your responses.
Unfortunately it's up to the school if they will put in a GFIC breaker. It was the best I could do at the time I set up the system. They claim they have no money.
