Just ran into a strange problem the other day. We are replacing a 1200A panel that is fed with bus duct from a switchboard. After the contractor opened up the duct, we realized there was no ground bus bar (or neutral bus bar either). So we called the manufacture, Sq D, and they noted that it wasn't uncommon for older bus duct not to have a ground.
So do I have to replace the bus duct with new? replace with conduit/wire? or add a ground wire? I am familiar 300.3(B) where all circuit conductors must be grouped together, so its probably not a simple as adding a ground wire.
Any thoughts would be appreciated!
Tom
So do I have to replace the bus duct with new? replace with conduit/wire? or add a ground wire? I am familiar 300.3(B) where all circuit conductors must be grouped together, so its probably not a simple as adding a ground wire.
Any thoughts would be appreciated!
Tom