bnbowen@uiuc.edu
Member
We are in the early design stage for replacing an elevator in 1960's school. We have a 277/480 volt panel in the elevator machine room fed from a 400 amp distribution panel. The 400 amp distribution panel is fed from a larger panel at the service entrance. The elevator requires a ground wire. The problem is, there is no ground wire in the conduit to either panel. Just RGS. Is it permissible to install ground bushings and jumpers inside the panels to properly ground the panels per 517.19(D) and have a compliant design? Thanks for your help once again.