Loop Length Calculator

Pertronic F120A and F100A Loop Length Calculator
Items	No of units	Quiescent Current	Total Quiescent Current
Apartment Module		7 mA	0 mA
Loop Relay		6 mA	0 mA
Loop Responder (Loop Powered)		27 mA	0 mA
Loop Responder (Ext Powered)		7 mA	0 mA
Conventional Smoke Detectors ++		0.05 mA	0 mA
Analogue Modules		0.35 mA	0 mA
Analogue Detectors		0.35 mA	0 mA
PS2 Sounder 24V		0.004 mA	0 mA
Fan Controller, Fan Relay		15 mA	0 mA
PSB Sounder		1.5 mA	0 mA
6500S Analogue Beam		2 mA	0 mA


Maximum Loop Current: Single End MUST NOT Exceed			350 mA
Total Loop Current = TQmax		Load OK	0 mA
Panel Battery Voltage			26 Volts
Peak Loop Voltage			24 Volts
Minimum Working Loop Voltage			15 Volts
Maximum Loop Volt Drop = VD			9 Volts
Cable Resistance Ohms/M (F100ZZCBL:1.25mm2 Twisted Pair Cable)			0.0312 Ohms
Maximum Allowable Loop Cable Resistance = VD/TQmax (Ohms)**			0 Ohms
Maximum Cable Loop Length Must Not Exceed			2500 Meters
Maximum Loop Length (m) - Load Spread Evenly Over Loop			0 Meters
Maximum Loop Length (m) - Load at end of Loop			0 Meters
** To measure Analogue Loop Cable Resistance: a) short the cable pair at one end. b) measure the resistance across the two conductors - red to black.
++ Include only Conventional Smoke Detectors connected to Loop Powered Loop Responders and Apartment Modules.

Max Cable Length =

0 M