Originally Posted by stlsig
This is a 120 v circuit and with the fans off it was drawing about 108 v and then once we kicked the fans on, it dropped to 105 v.
Does anyone have an idea what is causing this?
Yeah, it's a high resistance upstream of your AC, possibly caused by a loose connection.
Being careful of arc-flash, and using a 20A, 240v load like a wall oven or an elec. dryer, measure the 240v at the panel.
When you switch off
the wall oven the voltage should go up no more than ~0.4vac. You'll need a DVM to measure a change this small.
You're looking for the change
in voltage. It may be somewhat larger than 0.4vac, depending on how far away you are from the pole transformer.