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Can service condutors be installed in the same raceway/conduit with feeder or branch circuit conductors?
Monday, March 28, 2022
Feeder or branch circuit wiring is not allowed in the same raceway/conduit as service conductors. The reason is that service conductors (wires) do not have overcurrent protection, so a short between a service conductor and a feeder or branch circuit conductor in the same conduit would not trip a breaker and is a fire hazard.
But feeder and branch circuit wiring are allowed in the same conduit because they occur after the main breaker and have overcurrent protection in the event of a short. In a residence with an outside service panel and an interior subpanel for distribution, it’s important to recognize the difference between the service conductors coming in from the meter and the feeder conductors that run to the subpanel inside the home. Either of them can come into the panel at the top, bottom, or side of the panel. Both are often the same size wiring, but the service conductors are connected to the main breaker.
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