Ground

[j rae]

In conduit I'm pulling several ckts. can I pull just one ground and how do I size it ??

 

[david luchini]

In conduit I'm pulling several ckts. can I pull just one ground and how do I size it ??

You can use a single wire type equipment grounding conductor for multiple circuits in the same raceway, it should be sized per T250.122 for the largest overcurrent device protecting conductors in the raceway. See 250.122(C).

 

[GoldDigger]

You can use a single wire type equipment grounding conductor for multiple circuits in the same raceway, it should be sized per T250.122 for the largest overcurrent device protecting conductors in the raceway. See 250.122(C).

And beyond that don't forget that if the current carrying conductors of a determining circuit set are increased in size for purposes of reducing voltage drop, etc., then the EGC must be increased in size proportionally.
This could have the effect of requiring the size to be determined by the oversize conductors in a smaller branch rather than the normal size conductors in a larger branch.

Improbable just means it happens less frequently.

 

[Ponchik]

Depending on the conduit type and the distance you may not need an EGC.

But installing one is always a great idea.

 

[mike1061]

If it's metal conduit you can use the conduit as the ground.
Thanks
Mike

 

[ActionDave]

Depending on the conduit type and the distance you may not need an EGC.

But installing one is always a great idea.

Is it? Often it is it a waste of time, materials, and money.

Metal structure, multiple conduits, tons of parallel paths; even if there is a loose connector a fault clears with no problem.

 

[Bjenks]

Metal structure, multiple conduits, tons of parallel paths; even if there is a loose connector a fault clears with no problem.

If this was true then why would we need two paths of grounding for pool panels and different areas of hospitals?