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SAFSALE ENGINEERING TOOL

Fire Alarm NAC Voltage Drop Calculator

Estimate end-of-line voltage for a fire alarm notification circuit from source voltage, alarm current, conductor gauge and one-way cable length.

Conservative end-of-line voltage—
This uses a conservative lumped-load-at-the-end DC model and approximate copper resistance at 20°C. Real distributed NAC calculations should use the actual appliance locations, worst-case supply voltage, selected wire, temperature assumptions and manufacturer instructions.