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3.1.2 Communication Module
The communications module cover is manufactured from opaque polycarbonate inside which the
communication hub is mounted. Access to the hub is necessary to insert or change the GPRS/GSM SIM card.
Changing the communications technology is simply a matter of exchanging one communications module for
another.
Figure 4: GPRS/ZigBee hub fitted inside the hub cover
Communication Module Sealing
The communication module has two (2) sealing screws on either side of the module. Removal of the module
and access to the meters front cover for any reason requires the seals to be broken and the screws undone.
3.1.3 Meter Base with Terminal Block
The meter base and terminal block are manufactured from glass-filled polycarbonate. The terminal block is part
of the meter base and comprises four (4) tunnel type terminal bores for the termination of meter service cables.
The terminals are manufactured from brass with an internal bore diameter of 9.5 mm and can accommodate
2
2
2
service cables with a cross-sectional area of 35 mm
, 25 mm
or 16 mm
. Service cables are secured with two
M6 conductor screws made from mild steel (Zinc plated). The screw heads are combination slotted and cross
head. A securing torque of 3.5 Nm is recommended.
Figure 5: M6 Conductor screw
3.1.4 Terminal Cover
The meter is supplied with a short terminal cover which is manufactured from opaque polycarbonate and is
secured with a single sealable screw. The terminal cover must be removed to access the meters terminals and
lower main front cover seal. Provision is provided for terminal cover removal detection in power on and off
conditions. The connection diagram is marked on the inside of the terminal cover.
Figure 6: Inside of short terminal cover
Page 12 of 116
Liberty 100 Smart Electricity Meter Technical Reference Manual
BGX501-767-R02
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