Change to service (using switchboard as a raceway)

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I have a customer (Airplane hanger) that has a 1600 A switchboard. Due to a military requirement they want to relocate the feed to the hanger doors to parallel the main. The easiest way to do this is to tap above the main and set a disconnect adjacent to it. Then re-feed the existing conductors.
My question is about using the switchboard as a raceway. This feed is underground, so there is no other easy way to do it. It is almost 750' to the hanger door controller. 3 phase 100 amp circuit.
 
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