Cable Dimensioning; Max. Cable Length; 7.1.1 Formula For Calculating Max. Actuator Cable Length; 7.1.2 Max. Cable Length - ±24V Standard Actuators - Window Master WCC 103 BT Installation Instruction

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route the cables in the building according to the regulations in this instruction
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check all system functions

Cable dimensioning

7
Cables should be routed in compliance with applicable regulations.
7.1

Max. cable length

The maximum permitted cable lengths from the MotorController to the actuators, taking into account the cable cross-section, are
shown in the following table.

7.1.1 Formula for calculating max. actuator cable length

Max. cable length = permitted voltage drop 2V (UL) x copper's conductivity (56) x cable cross-section in mm
For ±24V standard actuators, the cable cross-section may not be less than 0.75 mm
formula.
Maximum actuator cable length: Always measured from the MotorController to the last junction box + actuator cable
Permissible max. voltage drop in the line: 2 Volt
Total actuator current: The sum of all the connected actuators max. current consumption per motor line
Note: do not use the PE wire / green/yellow wire in the actuator cable!
Example
Max. actuator cable length with cable cross-section of 0.75mm
7.1.2 Max. cable length – ±24V standard actuators
The actuator cable must have 2 wires minimum.
Cable-
cross-section [a]
Total
actuator current [l]
1A
2A
3A
Max. total actuator current per motor line in amperes (l) x 2
±24V standard actuators
The PE wire/the green-yellow earth wire must not be used
3-wire 3-wire
0.75mm² 1.50 mm²
42m 84m
21m 42m
14m 28m
2
, irrespective of the result of the above
2
and 2A current consumption: (2 x 56 x 0.75) : (2 x 2) = 21m
5-wire 3-wire
1.50 mm² 2.50 mm²
2-wire
parallel
168m 140m
84m 70m
56m 47m
7
2
(a)
5-wire 3-wire
2.50 mm² 4.00 mm²
2-wire
parallel
280m 224m
140m 112m
93m 75m