Now the electricians who did this install and caused the ground faults are highly trained and should know better .
MC Connectors are only listed to be used with metal clad cables not plastic jacketed.
They should have used Romex/ NMC connectors or plastic bushing but they chose not to.
of course now we are getting ground faults and there responsible to make good on there work.
Why they chose to do what they did who knows might be only connectors thy had and seemed like they would work or where just too lazy to go get and wait for correct ones .
But either way its wrong and will need corrected and time and money lost. But thats not what all I found bad