Service fuse should be rated to protect 1.5 sq.mm cable.
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.
Ensure that the voltage selector in the power supply compartment is selected to match the mains
supply incoming voltage. If the voltage selector is set to AC: 115 V and AC: 230 V is applied the
fuse will blow. A spare fuse is supplied in the battery compartment. If the voltage selector is set to
AC: 230 V and AC: 115 V is applied the RCU will not sense source supply on. Short term overvoltage
of no more than +20% nominal voltage to the input voltage can be sustained for 1 hour without
damage.
1 Voltage Selector Switch
Fig. 24 Mains Voltage Selector Switch
5.7.1 Mains Cable Specification
The mains cable shall be two core cable with external insulation suitably rated for the voltage and
operating environment. It shall have the following additional specification:
External insulation is be circular in cross-section
External insulation diameter to be in range 8 mm to 12.5 mm
The external insulation is to be cut back as shown in figure 25 below.
The wire size of each core is to be in the range 1.5 mm
2
to 4 mm
2
. It is preferable to terminate
the wires with crimps as shown.
If IP 3x rating for terminal compartment is breached through
incorrect mains wire installation this creates a situation of
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