N93-586-84 Issue 04 AB Page 27 of 32 © Protec Fire Detection plc 2015
Detection circuit specifications
Number of detection zones 2 (3502), 4 (3504), 8 (3508)
Cable requirements Fire resistant screened cable
Maximum zone wiring length 500 metres
Maximum zone wiring resistance 15Ω per conductor
Maximum zone wiring capacitance 0.25µF conductor to conductor
Resistive end of line details 8.2kΩ ±5% ¼W
Capacitive end of line module details 100µF 35V ±5% capacitor in series with a 22Ω ¼W resistor
Maximum number of detectors per zone 25 Protec 3000PLUS/OP devices
Maximum number of devices per zone 32 (combination of Manual Call Points and automatic detectors)
Manual Call Point requirements
Must be fitted with a series resistor (150Ω to 680Ω).
A 180Ω ±5% ¼W resistor must be fitted for the 3500 to distinguish between
manual and automatic triggers on zones.
Alarm circuit specifications
Number of alarm circuits 2
Maximum current per circuit 400mA
Circuit overload protection Protected by a self-resetting thermal 'fuse'
Cable requirements Fire resistant screened cable
Maximum circuit wiring length 500 metres
Maximum alarm circuit capacitance 0.25µF conductor to conductor
End of line monitoring type Voltage reversal using common 0V
Resistive end of line details 10kΩ ±5% ¼W
Alarm circuit device requirements All devices connected to the alarm outputs must be polarised and suppressed
Pulse rate when output set to 'pulsing' Pulse rate of 2 second on and 2 second off
Auxiliary circuit specifications
Auxiliary 24V output current
150mA maximum (protected by monitored, self-resetting thermal 'fuse')
Any overload must be completely removed to clear a fault condition
Class change input Class change triggered when CC input connected to 0V with less than 50Ω
Global fire and fault output contacts Volt free changeover contacts rated at a maximum of 1A 24V dc (resistive)
Security codes
User security code 1 3 4 4 2 2
Engineer security code 3 1 4 4 3 1
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