Grounding on receways

[lmolinar]

On a current job we are installing several power feeders on the same raceway, cable tray in this case. We are sizing the grounding conductor for
this raceway accordingly to 250.95 (that means, as per the largest overcurrent device protecting circuit wires on the raceway). For
circuits drops to equipment, we are sizing the grounding conductor as per the overcurrent device protecting each circuit, then we tap this grounding drop to the grounding conductor on the cable tray.
Is this a code-approved practice? I can't find any reference on the code for it.

 

[dereckbc]

Re: Grounding on receways

Just curious, is this for DC powered equipment?

When you are talking feeder circuits, an EGC is ran with each circuit and paired with phase and neutral conductors. Sized per 250.122 or 250.95 1996 code

The same holds true with branch circuits. Or in other words you run an individual EGC with each circuit.

The only place where I have seen a common ground conductor not run with phase and neutral conductors is with DC power plants.

Refer to 300.3

[ June 03, 2003, 09:51 PM: Message edited by: dereckbc ]

 

[bennie]

Re: Grounding on receways

Dereck: Is an equipment ground conductor installed in each conduit based on the largest circuit? or is there one with each circuit?

 

[russ]

Re: Grounding on receways

Between 392.7, 250.120 and 250.122 I'd say it's OK.

Russ

 

[russ]

Re: Grounding on receways

I see I was reading while Dereck and Bennie were posting.
Seems we came up with something different anyhow.

[ June 03, 2003, 09:58 PM: Message edited by: russ ]

 

[russ]

Re: Grounding on receways

Cable tray allows single conductors 300.3(B),
Seems cable tray is a raceway.

 

[dereckbc]

Re: Grounding on receways

Ok, I guess I just didn't understand the original question. Just now caught the cable rack part.

You can use a common EGC for all circuits contained in a raceway.

Thanks Russ and Bennie, you woke me up.

[ June 03, 2003, 10:15 PM: Message edited by: dereckbc ]

 

[lmolinar]

Re: Grounding on receways

What I meant is that we have more than 2 AC circuits running on the same raceway, with a common EGC sized as per 250.95 (?96 code).
Circuits drop at different locations. Is it right to have the grounding conductor for this drops tapped to the common EGC conductor on the cable tray?.

 

[bennie]

Re: Grounding on receways

Tapping the ground conductor is the only way to connect each receptacle.

Dereck: Your batting average is still way above the average.

 

[lmolinar]

Re: Grounding on receways

Thanks to you all, you've been very helpfull.