Updated plans are required for alterations consisting of more than how many sprinklers?

• A. 10
• B. 20
• C. 30
• D. 40

Answer: (B)

Updated plans are required when changes to a fire sprinkler system affect a relatively large portion of the system, prompting a formal review to ensure the design still complies with fire code and functions properly. This threshold exists to catch substantial alterations that could impact hydraulics, head placement, and overall system performance. The correct option reflects that rule, aligning with the idea that smaller changes don’t always need a full plan update, while bigger ones do to maintain safety and code compliance. The other thresholds would either overburden the process for minor work or risk insufficient review for larger changes.