Final answer:
The student is asking about the NYC Building Code requirements for sway bracing on sprinkler systems. Historical zoning laws influence building design, but the specific installation date for sway bracing must be referenced from the current building codes, which address various structural and safety systems.
Step-by-step explanation:
The student's question relates to a specific requirement under the New York City (NYC) Building Code concerning the installation of sway bracing for sprinkler systems. The historical context provided mentions a zoning law from 1916 that influenced the design of skyscrapers, like the Chrysler Building and the RCA Building in Rockefeller Center. However, it does not directly answer the student's question about current building codes for sway bracing installation dates.
For a precise and current answer, one would need to reference the latest NYC Building Codes as they pertain to the installation of fire protection systems. These regulations are dynamic and typically cover a wide range of building systems including structural components, electrical systems, and fire suppression features such as sprinkler systems.
Sway bracing is an important safety feature designed to ensure sprinkler systems remain functional and structurally sound during a variety of different load conditions, including those caused by wind, seismic events, or the building's own movements.