Voltage Drop Calculator

Voltage Drop calculations for System Sensor AV products can be done using the Honeywell Online Tools for Fire (HOTFire) site. HOTFire is a free online site that enables users to quickly plan and model notification appliance circuits (NACs) using the entire line of SpectrAlert® Advance and L-Series. Other notification appliances can be loaded by each user. Its simple step-by-step process makes it easy for users to configure panels and circuits from a variety of devices to meet any specification requirement.


If you already have an active Honeywell account, ESDs or eVance users, your current login credentials can be used with HOTFire.

How-To Video: Add a Custom Device to Hotfire

User Guide: Voltage Drop Calculator​