Feeders

[Jchast]

I'm on revision 6 of a job I started 3 months ago. 2 questions at the moment.

I have a 600 Amp main feeder from the transformer, to a remote meter, to a 600 Amp building disconnect. From the disconnect, I have 3, 200 Amp subpanels. Nothing on the print regarding distribution. How do I account for this.?

Second question is in regard to my building bond. Do I need to run to the meter, or can I bond at the disconnect?

 

[augie47]

A lot of into missing:
Is the transformer in question a POCO service transformer or a customer transformer ?
What is the characteristic of the "feeder" (voltage, etc)
POCO meter or customer meter ?
What is the proximity of the subpanels to the 600 amp disconnect ?

 

[don_resqcapt19]

The only way to feed the 3 panels from the load side of the 600 amp OCPD is by using 240.21(B)(2).

I have no idea of what a "building bond" is, so can't answer that part.

 

[Jchast]

The only way to feed the 3 panels from the load side of the 600 amp OCPD is by using 240.21(B)(2).

I have no idea of what a "building bond" is, so can't answer that part.

Building bond would refer to Building steel And cold water

 

[Jchast]

A lot of into missing:
Is the transformer in question a POCO service transformer or a customer transformer ?
What is the characteristic of the "feeder" (voltage, etc)
POCO meter or customer meter ?
What is the proximity of the subpanels to the 600 amp disconnect ?

Yes, transformer is poco

 

[Jchast]

600 amp disconnect is on the same wall as the subpanels. Disco is outside, subs are inside

 

[Jchast]

120/208

 

[augie47]

Sounds like you have a 600 amp SERVICE, not feeder. In either event, don's advice (post #3) applies, 240.21 for feeders to subpanles (likely 10' or 25' max)
Grounding electrode conductors would normally originate in your 600 amp service disconnect.

 

[infinity]

I think that Augie nailed it. There is a 600 amp service with a 600 amp service disconnect which feeds three 200 amp panels. The GEC can terminate at the 600 amp disconnect or any point upstream of that. The conductors between the 600 amp disco and the 200 amp panels are tap conductors unless they're ampacity is 600 amps (not likely).

What size conductors are being used here?

 

[don_resqcapt19]

Building bond would refer to Building steel And cold water

"Building bond" does not exist in the NEC. It appears that you are asking about grounding electrode conductors.

If that is the case, they can be connected to the grounded conductor at any point between the service point and the grounded bus in the service equipment. They can also terminate at more than one location. The main bonding jumper must be installed in the service equipment.

 

[Jchast]

I am not installing service equipment. I have a remote meter, feeding a disconnect, feeding 3 subpanels.

 

[infinity]

I have a remote meter, feeding a disconnect, feeding 3 subpanels.

So the disconnect is the 600 amp that you mentioned and is not the service disconnect? What size conductors are you using?

 

[augie47]

Your grounding electrode conductors would normally originate in the 600 disconnect on the building in either event.

 

[Jchast]

I think that Augie nailed it. There is a 600 amp service with a 600 amp service disconnect which feeds three 200 amp panels. The GEC can terminate at the 600 amp disconnect or any point upstream of that. The conductors between the 600 amp disco and the 200 amp panels are tap conductors unless they're ampacity is 600 amps (not likely).

What size conductors are being used here?

No info on feeder size on single line

 

[infinity]

No info on feeder size on single line

Can you post a photo of the one-line?