Don Pedigo
New User
- Location
- Tennessee
I am assessing and making line drawings for an older facility in Springfield Tennessee. In my research, I've discovered three different grounding/bonding techniques on the 208/120 panels. One of which is completely wrong. The local inspector says per article 250.30 that the 208/120 system should be treated as a new service. By that he's telling me that I only carry my 3-conductors and grounded conductor from the transformer and bond the can. I see this way done on all of the old panels. The newer equipment has what would be called a four wire system. I've read forums that support the four-wire system but, I also see how 250.30 could be viewed as the inspector sees it. This plant is having serious voltage fluctuations and outages. I know grounding is the issue. Can you please clarify the correct way? Also, shouldn't EVERY panel hit the building steel? I haven't really gotten into the 480V panels so if you could include that in your answer I would greatly appreciate it.