Delta Grounding System

[kezetrum]

Hi

 

any body has experience also about triad ground rod assembly method (delta grounding rod installation), with 10 ft min. standard between the third ground rods, and connected each others with bare copper 4/0 AWG. This is become the standard of grounding plan for building since 1978 till now at my engineering office where I am working, may be you can explain the advantage and disadvantage between the other methods

 

thanks