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Fire & Gas Detection Loop Power Budget

Standby and alarm-condition voltage budget for a two-wire initiating device circuit carrying multiple detectors and an end-of-line resistor.

AAJappsEngineering Calculation Report

Fire & Gas Detection Loop Power Budget

Generic IDC loop-budget model, consistent with NFPA 72 design practice

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Panel & loop

V
Ω
Ω
V

Devices

mA
mA

Standby state

Standby loop current7.40 mA
Voltage at farthest device23.85 V

Alarm state

Alarm loop current36.90 mA
Voltage at farthest device23.26 V