Service verses feeders, fire proofing

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Here is the situation: 208Y120 3 Phase service, multi-tenant space. 800A Main disconnect to meter bank of 6 meters with 5-200A disconnects and 1-100A disconnect. Sleeves through outside wall to pull box on interior in ceiling space. Conduits branch from pull box to tenant spaces to panels. Conduits run through fire walls to other spaces and are sealed at walls. Only two tenants-one taking 3 units, and the other taking 2 units. Green tags for up to rough, cover in 3 unit space, no build out in 2 unit space (open). Service inspected to 800A disconnect and released to Utility for transformer install. Situation brought up by arch. doing build out for 3 unit tenant and then expanded by GC. No input from inspector. (More concerned about multiple to one metering for the tenants.) Just looking for answers and suggestions. Considered service or feeders based on main disconnect being at meter location? If needed, would 2" of cementous fire coating on all conduits help this situation? ;)
 
The 800A main should be the service disconnecting means. Everything after that are feeders.

Even if by some chance per PUC/POCO designation the disconnects after the meter bank are the service disconnecting means, the interior runs are still feeders.
 
Smart $ said:
The 800A main should be the service disconnecting means. Everything after that are feeders.

Even if by some chance per PUC/POCO designation the disconnects after the meter bank are the service disconnecting means, the interior runs are still feeders.
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There may be building code or local ordinance restrictions on running the main AC feeders for a rented space through the inside of other units rented to other customers.
Especially if the units are firewalled well enough to be considered separate buildings.

Both service wiring and feeders which are below ground covered by a minimum thickness of concrete are considered by the NEC to be outside the building.

The feeders must, in any case, be protected by OCPD at their starting point or else they will be subject to tap rule requirements.

All in all, in your case, barring local variations, I do not see a problem.
 
Alphabet said:
... If needed, would 2" of cementous fire coating on all conduits help this situation? ;)
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FWIW, Code specifies concrete or brick encasement not less than 2" thick [230.6, as referenced in other sections]. I don't believe cementitious fire coating qualifies as concrete, but subject to your AHJ's interpretation, not mine
 
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