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EGC size after long, upsized run

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Electromatic

Electromatic

Senior Member
Location
Virginia
Occupation
Master Electrician
I'm trying to confirm the proper EGC size for a service that will be partially temped-in during construction. It's a bit of an oddball, though. There is an existing 200A feeder run a long distance to a pole-mounted disconnect that then continues a short distance to a small pumping building. The temp service will be from the pole disconnect to the building. The long run is using 2 sets of 250kcmil Aluminum in (2)3"RMC conduits with the conduits acting as the EGC.
For the new temp from the pole to the building, I think a single run of 250kcmil (205A) will be okay. Can I just base the EGC size on that portion of the run on the 200A OCPD and use #6Cu/#4Al?
 
Electromatic

Electromatic

Senior Member
Location
Virginia
Occupation
Master Electrician
In the OP scenario: The plan for the temp service is to intercept the (buried) RMC conduits before the pole disconnect, install an in-ground box and run the temp direct-bury conductors from there to the building. Any thoughts on how to connect the temp wire EGC to the RMC? I'm thinking of letting the contractor just use plumbing ground clamps.
 
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