This panel is located in a unit of a condominium. It's not the best picture (since you can't see the ground bar) but here's the situation. I've got a 3 wire feed (the ground that appears to be a grounding electrode is actually the grounds twisted together from the branch circuits). The ground bar does not physically have a bonding strap to the panel but is attached to the enclosure. My understanding is this should be a 4 wire feed with the grounding electrode attaching to the ground bar. I realize that there is the possibility that they are using the metal conduit as the grounding electrode, but how do I know that?? This was in a 1969 condominum. Apparently, there was a Zinsco in it's place several years ago that they updated to a Square D. Don't know what year that happened. Any advice on how to write this up would be greatly appreciated!

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