George:
On the project I am on we have them both ways. Everything is a ground grid. For an Isolated ground in some instances they are installing a triad or Delta grid with insulated conductors connecting to a 1/4 in bus bar using insulated 4/0 copper and running all the isolated grounds to the bus. In other instances an Insulated 1/0 is run directly to the ground grid. EIther way all systems are connected to the grid (lightening, system, isolated grounds). WHat about ground conductors smaller than #6?
