Voltage Drop Rules Just Changed — Here’s What to Know

NFPA 72 (2025) brings important updates to Notification Appliance Circuit (NAC) design and verification. The new requirements strengthen system reliability and reduce the risk of device failure in real emergency conditions.

Key changes include:

• Updated, approved methods for voltage-drop calculations
• Verification of worst-case loading, including brownout and end-of-line scenarios
• Required documentation of each circuit’s voltage-drop and performance margin
• Alignment with UL minimum operating voltage to ensure strobes and horns remain within listed performance ranges

These updates directly impact fire alarm design, voltage-drop engineering, and code-compliant installations. Applying the 2025 methodology ensures notification appliances activate properly when every second counts.

Capitol City Fire Protection & Life Safety LLC helps Baton Rouge facilities stay ahead of NFPA 72 changes with compliant design, testing, and system documentation.

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