Home has one 300 amp supply, a 200 amp primary and a 100 amp secondary panel. Secondary panel was NOT a sub (auxillary) panel as it had it's own feed from one of the lugs off of the meter.

SEC was fed through panel # 1 (directly behind meter) to go into panel #2 (about 1 foot away from panel #1) using rigid metal conduit to bond the 2 panels together.

Panel #1 had #6 ground to grounding rod.
Panel #2 had no ground conductor attached to the bus bar from a ground source.

Questions:

1. Is this considered to be using panel #1 as conduit? (I say it does)

2. Is the bonding of the panels sufficient to ground panel #2? (I say no)

If not:
3. Can panel #2 be grounded to the same grounding rod as panel #1 or should it have a separate grounding rod?
4. Are you allowed to bond main panels?
5. If a separate grounding rod is used, does the 8' clearance between rods apply when the panels are side by side?


I did refer this service to an electrician for repairs of loose grounds, oversized breakers and an improperly wired GFI breaker and suggested that the electrician evaluate the grounding of these panels. Any information learned will be useful in the future.

Attached Images

Panel Setup.jpg (49.3 KB, 76 views)

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