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Doc. no. A100K11451 MCS Cable Calculation Document Date 13.11.2018 HKL
Calculation of Cable Area in Time Systems
General
To make a time system with impulse operated analog and digital slave clocks that performs
satisfactorily, the cable from the Master Clock to the Slave Clocks needs to be dimensioned
correctly.
A 10% voltage drop is allowed in the cable.
The length and area of the cable and the current (load) on the cable affect the voltage drop.
Formula
A = l x I x k
A = Area [mm
2
]
l = cable length [m]
I = current [A]
k = 0.015 [constant]
Power Consumption
Impulse Slave Clocks
Analog clocks minute ≤ 400 mm: 7.5 mA
Analog clocks minute ≤ 900 mm: 15 mA
Analog clocks sweep seconds hand ≤ 400 mm: 25 mA
Analog clocks minute 3-wire F/R ≤ 400 mm: 10 mA
Digital Clocks: 5 mA
Time-Code (TC) Slave Clocks
Analog clocks minute ≤ 400 mm: 14 mA (version with movement 113160-00)
Analog clocks minute ≤ 400 mm: 7 mA (version with movement 21634-00)
Analog clocks minute ≤ 900 mm: 20 mA
Analog clocks sweep seconds hand ≤ 400 mm, indoor: 12 mA
Analog clocks sweep seconds hand ≤ 400 mm, outdoor: 20 mA
Analog clocks sweep seconds hand ≤ 900 mm: 27 mA
Time-Code Marine (TCM) Slave Clocks
Analog clocks minute ≤ 400 mm: 20 mA
Analog clocks minute ≤ 900 mm: 20 mA
Analog clocks sweep seconds hand ≤ 400 mm, outdoor: 27 mA
Analog clocks sweep seconds hand ≤ 900 mm: 27 mA
Example
A time system consists of 40 analog clocks with a diameter of 300 mm.
The power consumption will then be 40 x 7.5 = 300 mA = 0.3A
Cable length is 100 meters.
A = 100 x 0.3 x 0.015 = 0.45 mm
2
Choose a cable with an area of at least 0.45 mm
2
.