Cathodic protection is its own beast so far a NEC-type systems are involved. Is it safe to assume that the 300kVA transformer is under the domain of the petrochem and not an electric utility? You might start by scrutinizing the listing instructions and, as needed, contact the “PCR-module” manufacturer for resolution. If this is new territory for the inspection authority, he may be easiest to work with if you approach him up front with as much PCR-specific application information as possible.
[This message has been edited by Bjarney (edited 05-04-2004).]