Service Entrance /CT Question

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A/A Fuel GTX

A/A Fuel GTX

Senior Member
Location
WI & AZ
Occupation
Electrician
Since most of my work is of the residential type, I'd like to verify that I'm thinking correctly on this situation. I need to feed a new Panel at a business that has an 800 amp CT cabinet as part of the service equipment. My design is to come out of the bottom of the CT cabinet with an underground conduit and run about 100' on the exterior of the building and then up and into a Panel with a main breaker. I will run a GEC from the new panel to the existing GEC system and connect via a tap at that point. My line of thought here is that I can install these service entrance conductors at any length without a disconnect as long as they are outside of the building. Are my assumptions correct?
 
If the new panel is not near the existing ones, how will comply with:

230.71 Maximum Number of Disconnects.
(A) General. The service disconnecting means for each service
permitted by 230.2, or for each set of service-entrance
conductors permitted by 230.40, Exception No. 1, 3, 4, or 5,
shall consist of not more than six switches or sets of circuit
breakers, or a combination of not more than six switches and
sets of circuit breakers, mounted in a single enclosure, in a
group of separate enclosures, or in or on a switchboard. There
shall be not more than six sets of disconnects per service
grouped in any one location.
 
jumper said:
If the new panel is not near the existing ones, how will comply with:

230.71 Maximum Number of Disconnects.
(A) General. The service disconnecting means for each service
permitted by 230.2, or for each set of service-entrance
conductors permitted by 230.40, Exception No. 1, 3, 4, or 5,
shall consist of not more than six switches or sets of circuit
breakers, or a combination of not more than six switches and
sets of circuit breakers, mounted in a single enclosure, in a
group of separate enclosures, or in or on a switchboard. There
shall be not more than six sets of disconnects per service
grouped in any one location.
Click to expand...

Great point and that's why I tossed this out here. The existing setup is an exterior CT cabinet feeding 4 disconnects on the same wall but on the inside of the building. Sounds like I'll have to plan on going from the CT cabinet to an interior disconnect and then back out to the panel either underground or up through the attic, which would be a monumental task given the close quarters up there.
 
Would these even be considered service conductors? I know they wouldn't from a resi. meter. But I'm not sure on a CT type setup.
 
Little Bill said:
Would these even be considered service conductors? I know they wouldn't from a resi. meter. But I'm not sure on a CT type setup.
Click to expand...

Yes they would be considered service entrance conductors up to the point of the line side of the first disconnect. The same would be true in a residential situation.
 
A/A Fuel GTX said:
Great point and that's why I tossed this out here. The existing setup is an exterior CT cabinet feeding 4 disconnects on the same wall but on the inside of the building. Sounds like I'll have to plan on going from the CT cabinet to an interior disconnect and then back out to the panel either underground or up through the attic, which would be a monumental task given the close quarters up there.
Click to expand...

You could also put disconnects or a larger MDP to supply the existing panels plus your new one someplace else if that works better.

Keep future load in mind, if they know they will need more capacity it could be time to start planning for it, your addition makes 5 service disconnects, you can only have 1 more.
 
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