When are updated plans required for sprinkler system alterations?

• A. For All Alterations Consisting Of More Than 20 Sprinklers
• B. Only For Alterations Exceeding 100 Sprinklers
• C. Only For Changes To The Building's Occupancy
• D. Only When The Owner Requests Them

Answer: (A)

When you modify a sprinkler system, updated plans are required if the work involves more than twenty sprinklers. This threshold ensures that significant changes are properly documented so the design, head locations, piping, valves, and hydraulics are accurately reflected and stay in line with current codes. Updated plans help the authority having jurisdiction verify that the water supply, zoning, and control equipment are correct and that inspections proceed smoothly. Changes to occupancy or owner requests aren’t the deciding factors here; it’s the scale of the alteration—specifically involving more than twenty sprinklers—that triggers updating the plans.