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A subcode, under the NJUCC, is essentially an area of technical specialty. The major ones are Building, Electrical, Fire Protection, Plumbing and Elevator. The UCC defines the technical requirements for each Subcode in NJAC 5:23-3.1 et seq. For each of these subcodes the UCC adopts large portions of model codes that are enforced in many parts of the United States. They do not adopt any one of these in its entirety. To find out the technical requirements of any of the subcodes, one must annotate the model code to reflect the modifications enumerated in NJAC 5:23-3.1, et seq. The DCA Division of Codes and Standards Web Site contains the currently adopted model codes.

It is important for the designer to also be conversant with the Barrier-Free Subcode, which addresses accessibility for the disabled, and the Rehabilitation Subcode. which is for use in existing buildings. These are not enforced by a single Subcode Official. The duties are allocated in accordance with the UCC.

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