philhanna@comcast.net
Member
I am designing a switchgear installation (480Y/277) that will be fed by a Utility wye-wye 2500kva transformer. The utility intends on grounding the neutral to a ufer in the vault. They want me to bring my 11 sets of 4-500 kcmil to the transformer and connect the switchgear neutral bus to the switchgear ground bus. If I were to do that, how should I size the ground ring and electrodes at the switchgear and will that cause a problem with the neutral being grounded at two points?