Fire-fighters communication system EN 81-72

Description
Specifications

The fire-fighters communication system enables a two-way communication between the car of the fire-fighters lift, the fire-fighters access level and the machine room of the lift.

The system consists of three components:

handset (handset/ exchange)
fire-com (hands-free speakerphone/ fire-fighters speakerphone)
free-com (hands-free speakerphone/ car speakerphone)

Fire-fighters operation is initiated via the fire-fighters switch.

Connectivity
Lines	High, Low, GND, Line
Electrical data
Power supply	24 V DC (±15 %)
Current consumption (closed-circuit status)	approx. 40 mA
Operating voltage	min. 12 V
Current consumption (operating status)	approx. 150 mA
Current consumption (communication)	approx. 250 mA
Other
Network extension (with 0.5 mm²)	max. 250 m
Network extension (with 1 mm²)	max. 500 m
Number of participants (handsets)	1
Number of participants (hands-free speakerphones)	2
Compliance
EN 81-72	X

Topology

Fire-fighters communication system EN 81-72

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