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Fire Alarm System Class A Wiring Copyright 2012 Douglas Krantz [email protected] www.DouglasKrantz.com All fire alarm wiring needs to be installed so that a current from the panel will supervise all wires and connections. Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Supervising current from the fire alarm control panel flows through all wires, connections, and the End-of-Line resistor, making sure broken wires or bad connections will be found and repaired before a fire occurs. Supervised Class A Wiring Wire Supervising Current + + + - Fire Alarm Control Panel + + + - B Out A Return B Out A Return End Of Line Resistor Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Fire Alarm Device Broken Wire in Class A Wiring Wire Supervising Current is no longer passed through the circuit because of a broken wire. + + + - Fire Alarm Control Panel + + + - B Out B Out End Of Line Resistor Loss of Supervising current causes the fire alarm control panel to switch to feeding the circuit from both ends. Even if there is a fire, all devices will still be working because there are now two Class B loops instead of a single Class A loop. B Out B Out Class B Loop Class B Loop

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CLASS A WIRING PROCEDURE

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Page 1: Class a Wiring

Fire Alarm SystemClass A Wiring

Copyright 2012 Douglas Krantz

[email protected]

www.DouglasKrantz.com

All fire alarm wiring needs to be installed so that a current from the panel will supervise all wires and connections.

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

Supervising current from the fire alarm control panel flows through all wires, connections, and the End-of-Line resistor, making sure broken wires or bad connections will be found and repaired before a fire occurs.

Supervised Class A Wiring

Wire

Supervising Current

+++

-

Fire AlarmControl Panel

++

+

-

B Out

A Return

B Out

A Return

EndOf

LineResistor

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

FireAlarmDevice

Broken Wire in Class A Wiring

Wire

Supervising Current is no longer passed through the circuit because of a broken wire.

+++

-

Fire AlarmControl Panel

++

+

-

B Out

B Out

EndOf

LineResistor

Loss of Supervising current causes the fire alarm control panel to switch to feeding the circuit from both ends. Even if there is a fire, all devices will still be working because there are now two Class B loops instead of a single Class A loop.

B Out

B Out

Class B Loop Class B Loop

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