TWO BUILDINGS ONE GROUND ROD

[bphgravity]

Re: TWO BUILDINGS ONE GROUND ROD

250.60, "Differerent Sytems" not different services. systems is refering to the other electrodes that might have been used at the premises again specified at 250.50

 

[bphgravity]

Re: TWO BUILDINGS ONE GROUND ROD

Potentially dangerous neutral current can flow on the grounding electrode conductor when multiple services are grounded to the same single electrode. This occurs beacause neutral current from each service has multiple parallel return paths back to the electric utility power supply. This is of particular concern if the grounded (neutral) conductor from one of the services is opened.