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102.4 Additions, alterations or repairs.
Additions, alterations, renovations or repairs to installations shall conform to that required for new installations without requiring the existing installation to comply with all of the requirements of this code. Additions, alterations or repairs shall not cause an existing installation to become unsafe, hazardous or overloaded.
102.4.1 Minor additions, alterations, renovations and repairs.
Minor additions, alterations, renovations and repairs to existing installations shall meet the provisions for new construction, unless such work is done in the same manner and arrangement as was in the existing system, is not hazardous and is approved.
102.4.2 Special provisions for prior code buildings.
In addition to the requirements of Sections 102.4 and 102.4.1, the provisions of Sections 102.4.2.1 through 102.4.2.3 shall apply to prior code buildings.
102.4.2.1 Number of plumbing fixtures.
For prior code buildings, the number of required plumbing fixtures shall be permitted to be calculated based on the 1968 Building Code utilizing the occupant load figures for the 1968 Building Code, or shall be permitted to be calculated based on the New York City Plumbing Code utilizing the occupant load figures from the New York City Plumbing Code.

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