User is to ensure that radio/modem selected has appropriate
fire safety ratings and has no failure mode that could result in
causing a fire.
The radio must be powered via the RCU Serial Port.
If the radio uses a power supply from the battery (via the Serial
Port), the radio cable must be fitted with a 6A fast acting fuse
in the cable.
1 Radio or Modem
2 Mounting Plate
3 Radio Tray
Fig. 32 RCU and Voltage Transformer Earthing Diagram
5.12 External Antenna Connection
To enable long range wireless connection to the SCADA control centre it will be necessary for the
user to fit an appropriate external antenna. The antenna cable is passed through a cable gland at
the rear of the RCU enclosure and connected to the users radio equipment. The cable gland must
be tightened to clamp the cable. It may be desirable to fit an antenna surge arrestor inside the RCU
cubicle. The surge arrestor should be grounded to the 6mm earth stud inside the RCU cubicle.
Do not disconnect earth wire.
Do not disconnect earth wire from the terminal block to the
cubicle earth stud. After installation of surge arrestor, ensure
the earth wire to the power supply compartment is still
connected.
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