Cable Dimensioning; Maintaining The Cable Functions; Max. Cable Length; Formula For The Calculation Of The Maximum Actuator Cable Length - Window Master CompactSmoke WSC 104 S AR Installation Instructions Manual

Cable dimensioning

8
8.1

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 actuator is part of the system component‚ electric actuator 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 firefighting authorities.
8.2

Max. cable Length

Maximum permissible cable length from the smoke ventilation panel to the actuators and pyrotechnic gas generator taking into
account the cable cross-section is shown in the following tables for "± 24V standard actuators", "MotorLink
pyrotechnic gas generator.

8.2.1 Formula for the calculation of the maximum actuator cable length

Max. cable length = permissible voltage drop 2V (UL) x conductivity of copper (56) x cable cross section in mm
For both ±24V standard actuators and actuators with MotorLink
regardless of the result of above formula.
Maximum actuator cable length: Always measured from the smoke to the last junction box
Permissible max. voltage drop in the line: 2 Volt
Actuating current: Sum of all actuator power consumption per motor line
Note: do not use the PE wire / green/yellow wire!
Example
Max actuator cable length with cable cross section 0.75mm
8.2.2 Max cable length – ±24V standard actuators
The actuator supply cable must have 3 wires: 2 wires current carrying / 1 wire for monitoring.
cable cross
section [a]
Total
actuator current [I]
1A
2A
3A
4A
8.2.3 Max cable length – actuators with MotorLink
The actuator supply cable must have 3 wires: 2 wires current carrying / 1 wire for communication.
When a 5-wire cable is used for MotorLink
It is not recommended to use parallel wire.
actuator
max. current total in amps (I) x 2
±24V standard Actuators
Do not use the PE wire / green/yellow wire!
3-wire 3-wire
0.75mm² 1.50 mm²
42m 84m
21m 42m
14m 28m
11m 21m
®
®
the cross section of the cable must not be less than 0.75mm
2
and actuator current 2A: (2 x 56x0.75) : (2 x 2) = 21m
5-wire 3-wire
1.50 mm² 2.50 mm²
2-wire
parallel
168m 140m
84m 70m
56m 47m
42m 35m
®
ML-comm = MotorLink
actuators" and
®
2
(a)
5-wire 3-wire
2.50 mm² 4.00 mm²
2-wire
parallel
280m 224m
140m 112m
93m 75m
70m 56m
®
communication
2
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