Unless the RCU is operated from a dedicated power transformer mounted on the same pole it is
recommended to install surge arrestors on both the incoming LV Active and Neutral grounded to the
external cubicle earth stud.
Do not disconnect earth wire.
Do not disconnect earth wire from the terminal block to the
cubicle earth stud. After installation of mains supply ensure
the earth wire is still connected.
5.7.3 Installation Process – Incoming Mains Connected to Power Isolation Unit
If the RCU is supplied with a power isolation unit then the incoming mains active and neutral are
connected to the terminal block in the isolator rather than the terminal block in the electronics
housing. The specification for the mains wire is the same as above. When the power isolation unit
is factory fitted to the RCU, the power cable to the electronics housing will be pre-fitted to the
electronics housing.
1 The mains cable is fed through the cable gland on the RCU enclosure a suitable amount
to allow connection into the power isolation unit. The cable gland should be tightened to
clamp the mains cable.
2 The cover of the power isolation unit is then removed by a suitably qualified person by
undoing the screws on the front.
3 The mains cable is fed through the gland in the power isolation unit. Ensure the gland
seals around the insulation of the mains cable.
4 Active and neutral of the mains cable are connected into the power isolation unit terminal
block and tightened in place. Ensure the correct wire is installed into the matching
terminal block.
5 Fit the power isolation unit cover and screw in place (torque 1.5 Nm) using screw driver.
6 Plug the cable from the RCU electronics compartment into the labelled socket on the
power isolation unit.
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