question from student

[domnic]

if run three conduits from a load center to a junction box can i use one equipment grounding conductor in one of the conduits for all the c ircuts leaving the junction box.

 

[iwire]

Re: question from student

Yes and no.

While 250.122(C) explains how to size the grounding conductor when used for multiple circuits.

250.122(C) Multiple Circuits. Where a single equipment grounding conductor is run with multiple circuits in the same raceway or cable, it shall be sized for the largest overcurrent device protecting conductors in the raceway or cable.

That is only allowed per raceway as 300.3(B) requires all conductors (including the grounding conductor) of a circuit to be in the same raceway.

If you have 3 raceways between the load center and the junction box each containing multiple circuits you will only be required to run one grounding conductor in each raceway sized to the largest circuit in that raceway.

 

[domnic]

Re: question from student

THANK YOU. THIS FORUM HAS BEN A LOT OF HELP TO ME REINFORCEING MY INTERPRETATION OF THE NEC. BILL SECOND YEAR STUDENT.

 

[ryan_618]

Re: question from student

Bill: I thought you said in another post that you were an instructor. Are you a second year apprentice or an instructor?

 

[domnic]

Re: question from student

bill is one of my students.