Question

In an ungrounded electrical systems with conductors installed in grounded metal raceways and enclosures, what is the voltage from the current carrying conductors to the metal raceways and WHY?

Answer 1

An increased degree of protection in solidly
grounded systems can be achieved in providing ground-fault protection that will shunt trip circuit
protective devices when user-selected levels of ground fault or leakage current flow are
detected in electrical circuits. This is required to be installed on all solidly grounded wye
services of more than 150 V to ground but not exceeding 600 V phase-to-phase where the
service disconnecting means is rated at 1,000 A or more