For safe installation ensure that the supply from the voltage
transformer is isolated and de-energised. Use a single pole
device before connecting to the RCU.
It is mandatory that the user installs a service fuse (2A) and
point of isolation externally to the RCU.
For safe maintenance ensure that the supply is isolated
elsewhere before removing the power supply compartment
cover
Fit the power supply compartment cover before energising
RCU supply.
When installing the VT supply ensure that the voltage selector
in the power supply compartment is selected to match the VT
secondary voltage. Incorrect voltage selection may result in
the fuse blowing.
The VT secondary power supply cable specification and installation process is identical to the mains
cable specification and installation in section 5.7.
5.10 Earthing
Earthing of the RCU and connected accessories in the correct way is critical to ensuring operator
safety.
Incorrect earthing of the RCU may expose operators to
dangerous voltages that may result in death or serious injury.
The RCU cubicle should be bonded to ground using the M12
earth stud provided to meet the safety requirements of the
utility. The earth wire must be 16mm
2
in size or larger. It is the
user’s responsibility to provide the earth wire.
5.10.1
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