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Diagram of Class B Wiring

Free PDF Diagram:

Fire Alarm System Class B Wiring

See how to wire a fire alarm system using Class B wiring.

See how the Class B Wiring detects wiring problems in a building.




Class B Wiring for Fire Alarm System is a protective method of wiring. It is designed so that the Fire Alarm Panel can detect a broken wire, and the wiring can be fixed before there is a fire.

The Diagram Shows:
  • How the wires go in and out of each device, for total supervision of the wiring.
  • How the supervising current follows the wires to every device on the input or output zone.
  • Why "T-Taps" should never be used in Class B Wiring.