Last Editor Paul Cox - Siemens ST950 Handbook

Example, assuming a distance of 100 metres using 1.0mm
Reg Sign supply cable: 7W at 100 metres = 1 core
RAG traffic signal drive cables: 12W at 100 metres = 1 core each (x3)
RA + Reg Sign common return cable: 19W (12W+7W) at 100 metres = 1 core.
Green return cable: 12W at 100metres = 1 core
It should be noted from looking at Table 14 that above 100 metres, 2 cores would be
required for the 19W common return, and above 160 metres, 2 cores would also be
required for each 12W signal drive cable.
6. Tactile units are to be provided with a separate drive and return core. Tactile units
driven from the same phase green LSLS output can share a common drive and
return core. For the purposes of assessing acceptable cable run lengths using the
table, each tactile unit should be considered to be a 12W load.
If required to reduce core usage, tactile units may share a return core with any
Red/Amber LED signal return core on the same pole (NOT Green as this must
always have its own return). If this option is exercised each tactile unit should be
considered to be a 45W load for the purposes of assessing acceptable cable run
lengths using the table. This figure is much higher than their normal running power,
but is typical of the power consumed if the tactile device is physically held, stopping
the motor.
7. The ELV solar cell should be provided with a drive and return core for connection of
the solar cell supply and signal. The solar cell return can be commoned with the
LED signal return. Its effect on the voltage drop is so small that it can be ignored.
8. Returns for digital inputs (for above ground detectors and pushbuttons etc on the
same pole) may be commoned together, but must remain separate from the LED
signal returns.
Security classification Unrestricted
Version 4
Last Editor Paul Cox
Document Name ST950 General Handbook
Copyright © Siemens plc 2015. All Rights Reserved.
Mobility Division, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
2
cable:
Page 58 of 107
Status Issued
Date 16-Jul-2015
Document No. 667/HB/46000/000
Mobility is a division of Siemens Plc