In an older existing precast concrete building (no effectively grounded structural steel)with all of the interior piping insulated can the primary equipment grounding conductor (EG) if sized correctly per table 250.66 be used as the grounding electrode conductor (GEC) for the secondary XO connection. This proposed GEC would connect to the service grounding bus bar and the ground bus for the service is not smaller than the required grounding electrode conductor.
What do you all think is this a code compliant system?
What do you all think is this a code compliant system?