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5.5. Installation of the Break glass unit, ventilation keypad
and detector
Ensure that the break glass unit and the ventilation buttons are visible and well accessible.
Do not install behind protruding walls, door panels or hidden by the building structure.
Note: Installation height of the break glass unit = 1.4 m above floor.
Install the automatic detectors in accordance with their enclosed instructions.
6. Cable dimensioning
Maintaining the cable functions
According to valid national regulations.
The cable network for smoke ventilation
systems („Cable system“) ends normally at the interface (junction box)
for the actuator!
The flexible, heat resistant connection cable of a
ctuator is part of the system component ‚electric motor
actuation' and is not a part of the electrical installation!
We recommend in all cases to discuss the type of cable routing with the competent fire fighting
authorities.
6.1. Cable length table
For determining the maximum permissible cable lengths between the smoke control panel and the actuators,
taking into account the specified cables cross sections, please refer to the following table:
Maximum actuator current: 4.8A (
Note:
Be aware of the overall capacity of the smoke control panel!)
Actuating current: Sum of all motor currents per group module
Maximum cable length: (always routed from the central smoke control panel to the last junction box)
Note:
Do not use the green/yellow wire!
Per motor supply line, 3 wires are required ( 2 wires current carrying /1 wire for monitoring )
Cross section
3 wire
5 wire
3 wire
5 wire
3 wire
1.5 mm²
1.5 mm²
2.5 mm²
2.5 mm²
4 mm²
Actuator current
in Amps
(2 wires in
parallel)
(2 wires in
parallel)
1
84.00 m
168.00 m
140.00 m
280.00 m
224.00 m
2
42.00 m
84.00 m
70.00 m
140.00 m
112.00 m
3
28.00 m
56.00 m
47.00 m
93.00 m
75.00. m
4
21.00 m
42.00 m
35.00 m
70.00 m
56.00 m
(The information is valid for ambient temperatures of 25°C)
Formula for the calculation of the maximum cable length
max. cable length = permissible voltage drop 2V (
UL
) x conductivity of copper(
56
) x cable cross section(
A
)
max. actuator current total (
I
) in amps
x 2
Permissible max. voltage drop in the line UL : 2 Volt
Permissible cable length for the break glass unit supply cable when using......4x2x0.8mm:
up to 200m
The motor connection cable length to the junction box (or control module) must not exceed
10 m
.
