EG In Homeruns

[Alwayslearningelec]

If you were running several of these circuits in one conduit out of the panel you would only need a single EGC correct? They show one for each circuit.

 

[kwired]

Correct - EGC sized to largest OCPD protecting any conductor in the conduit, or at least no larger than the associated ungrounded conductor in some cases. Motor circuits is where this can be common - say you have a 45 amp breaker but 12 AWG motor conductors (can happen) - the EGC need not be larger than the 12 AWG ungrounded conductors in that case.

 

[LarryFine]

And, if the conduit is metallic, you may well need none.

 

[Alwayslearningelec]

Correct - EGC sized to largest OCPD protecting any conductor in the conduit, or at least no larger than the associated ungrounded conductor in some cases. Motor circuits is where this can be common - say you have a 45 amp breaker but 12 AWG motor conductors (can happen) - the EGC need not be larger than the 12 AWG ungrounded conductors in that case.

Thanks. Could they actually ask for a separate EGC be pulled in common conduit for each circuit. Which code section references needing to only include one EGC in a "homerun" pipe? THanks

 

[don_resqcapt19]

Thanks. Could they actually ask for a separate EGC be pulled in common conduit for each circuit. Which code section references needing to only include one EGC in a "homerun" pipe? THanks

That is a design issue. If the project specifications call for an EGC for each circuit, you need to install it, unless you took exception to that when the bid was submitted.

250.122 (C) Multiple Circuits.
A single equipment grounding conductor shall be permitted to be installed for multiple circuits that are installed in the same raceway, cable, trench, or cable tray. It shall be sized from Table 250.122 for the largest overcurrent device protecting circuit conductors in the raceway, cable, trench, or cable tray. Equipment grounding conductors instal⁠led in cable trays shall meet the minimum requirements of 392.10(B)(1)(c).

 

[infinity]

Thanks. Could they actually ask for a separate EGC be pulled in common conduit for each circuit. Which code section references needing to only include one EGC in a "homerun" pipe? THanks

Sure, they could over design and waste lots of money in the process for zero added safety.

 

[kwired]

Sure, they could over design and waste lots of money in the process for zero added safety.

Those EGC's do count as conductor fill and could require you to increase raceway size because of more fill.

Need to check box fill, I know there been some recent change there, but I believe if a cable or raceway had more than one EGC entering the box it did increase the number of conductors in the box even with past methods. If you had a normal EGC and an Isolated ground entering the box that is where that may have been more likely to happen.