C.T. Cabinet Sizing

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KWH

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I have a job due to appearance I am trying to use a smaller cabinet. The dimension's are 24" tall 32" wide 10" deep with ( 12 ) 250 al conductors. I am not sure if you tried to figure cubic inch you still have 2 C.T.'s inside. This is for a single phase 400amp. I have dealt more with 3phase 600amp and up and install a cabinet that is 44" in length.
 
If the NEC applies to this cabinet (which I doubt) you do not size it per the cubic inches. You must size it per the raceway sizes, quantities and locations.

I think it is likely that this CT cabinet is under the exclusive control of the utility and the utility would have to tell you the minimum size they allow.

90.2 Scope.

(B) Not Covered. This Code does not cover the following:


(5) Installations under the exclusive control of an electric
utility where such installations

a. Consist of service drops or service laterals, and associated
metering, or

b. Are located in legally established easements or
rights-of-way designated by or recognized by public
service commissions, utility commissions, or other
regulatory agencies having jurisdiction for such installations,
or

c. Are on property owned or leased by the electric
utility for the purpose of communications, metering,
generation, control, transformation, transmission, or
distribution of electric energy.

FPN to (4) and (5): Examples of utilities may include those
entities that are typically designated or recognized by governmental
law or regulation by public service/utility commissions
and that install, operate, and maintain electric supply (such as
generation, transmission, or distribution systems) or communication
systems (such as telephone, CATV, Internet, satellite, or
data services). Utilities may be subject to compliance with
codes and standards covering their regulated activities as
adopted under governmental law or regulation. Additional information
can be found through consultation with the appropriate
governmental bodies, such as state regulatory commissions,
the Federal Energy Regulatory Commission, and the
Federal Communications Commission.
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