Fascinating.
I note the main disconnect also breaks the neutral.
As this is "Old Urban", for the Distribution Panel Earth bonding...is the bond made to the gas pipe system if that is the only piping in the dwelling? Is there an additional ground created by driven or buried ground rods or something like 'em?
Is the underground service cable armor in direct contact with earth, and if so, what is it constructed of?
So many questions, so little time.
Al
