In a campus 15kV underground system a 4/0 AWG bare ground wire was installed (embedded) within the cement of the duct bank surrounding the non-metallic ducts and it is terminated at each manhole ground rod/ring. A typical feeder consists of three shielded phase conductors and an insulated ground conductor. If there is line-to-ground fault the return fault current will divide itself among the metallic shields and ground conductor. What is the purpose of the 4/0 ground wire, that is not bonded to the rebar within the duct bank cement?
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Campus 15kV underground system
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