I wire more homes in Westmoreland County than any other electrical contractor. The homes I wire start at $320,000 and go up. I've averaged 60 new homes per year since 1980. I also wire high end kitchens for the largest kitchen cabinet company in the County. I have two teaching degrees in the State of PA., K-12, and Vo-Techs . One is for electrical, Since I have a masters degree, I'm also certified to teach at the Universities. The electrical inspector I use has an electrical engineering degree from Penn State. We talk often and I always pass inspection. I also do commercial and industrial wiring including motor controls and overhead crane repair.
I'm not bragging, but when someone attacks my knowledge I need to defend myself.
Very Nice Electromen®
Sounds like You have some good experience under your belt.
I do know that GFCIs and Appliances , tools or whatever you connect them to operate differently in different applications/situations.
As far as I can remember GFIs in homes were made to protect people from getting hurt while working in wet or damp environments. Or a dummy that drops the hairdryer in the bathtub. Hard to protect a dummy, no mater how hard you try.
When GFCIs are put on everything in the House, they can make more problems for the end user.
If a appliance has a fault normally the GFCI does little to make the appliance or You any safer.
That is why appliances have built in safety devices. Redundancy is better used in Aircraft.
When I worked on REAL Ground Fault systems used on 3 phase Oil Drilling Systems, Where you have a Meter actually telling you the amount of Fault Current, I realized the affect of different equipment operating on the same Electrical Source.
When you have a problem in a system that is drilling, the last thing that you want is for a breaker to trip. That is why they use Alarms, Not Automatic Ground Fault Interrupters.
If the electrical load is far enough off it will blow the Feeder Fuse.
Stick in there and teach us all something new.
I am a old dog that likes to learn new tricks...
DonL®