Equipment & Systems
Low-Voltage & Communications
Estimate low-voltage cable drop and compare communications equipment power limits.
Not sure where to start? Choose by task and required inputs.
Fire Alarm Battery Load WorksheetCalculate standby and alarm amp-hour demand from project inputs.Low-Voltage Cable Voltage Drop EstimatorEstimate two-wire DC cable drop from manufacturer resistance data.PoE Power Budget EstimatorCompare device demand with switch and port power limits.Notification Appliance Circuit Voltage Drop CalculatorEstimate segment-by-segment DC voltage drop and appliance terminal voltage.Access Control Power Supply CalculatorEstimate controller, lock, and accessory current for standby and simultaneous activation.Security System Backup Battery CalculatorEstimate backup capacity from security system standby and alarm loads and durations.Distributed Speaker Load CalculatorSum speaker transformer taps and compare with amplifier output capacity and headroom.
Which tool fits your task?
Choose by system behavior and required output. A PoE budget, radial DC voltage-drop calculation and speaker tap inventory use different equipment data.
| Your task | Inputs to collect | Tool and scope |
|---|---|---|
| Estimate a two-wire DC cable voltage drop | Load current, route length and manufacturer conductor resistance. | Low-Voltage Cable Voltage Drop Estimator Confirm the actual circuit topology and permitted device terminal voltage. |
| Review a radial notification appliance circuit (NAC) | Segment lengths, downstream appliance currents and minimum terminal voltage. | Notification Appliance Circuit Voltage Drop Calculator The supported radial steady-DC model does not represent every NAC arrangement. |
| Compare PoE device demand with switch and port capacity | Device demands, power-source limits and the documented power basis. | PoE Power Budget Estimator A power-budget result does not certify the copper link. |
| Sum distributed speaker transformer taps | Line voltage, speaker tap watts, amplifier capacity and entered margin. | Distributed Speaker Load Calculator Use the tap for the correct voltage column; bypass is a different operating mode. |
| Inventory access-control supply loads | Controller, lock and accessory currents in the recorded states. | Access Control Power Supply Calculator Current totals do not decide lock mode or egress compliance. |