How many dedicated equipment grounding conductors should be installed in a conduit with four dedicated circuits?

In a conduit with multiple dedicated circuits, the National Electrical Code (NEC) allows for a single equipment grounding conductor (EGC) to serve all of the circuits within that conduit, as long as certain conditions are met. The primary purpose of the EGC is to ensure safety by providing a low-resistance path back to the ground in the event of a fault.

Having one dedicated equipment grounding conductor for multiple circuits simplifies installation and reduces the amount of copper needed, while still ensuring that all circuits are properly grounded. As long as the circuits are grouped together in the same raceway and each circuit is dedicated, you can use one EGC.

The incorrect responses would imply that each circuit requires its own separate grounding conductor. While this is permissible if desired, it is not a requirement in scenarios with multiple dedicated circuits placed in a common conduit. Therefore, for four dedicated circuits in a conduit, the choice of one equipment grounding conductor is in full compliance with NEC provisions—making it the most efficient and appropriate option.