Elster A1120, User Manual

Page: 46 / 157

38
A1120/40 - Electronic Polyphase Meter
©
Elster Metering Limited - M181 001 2G - 5/2010
In order to assist the installer the following guidelines are given: -
1. Keep a.c. circuits and d.c. circuits separated by a minimum of 50mm where possible
2.
Where a.c. and d.c. circuits must cross, do so at right angles to each o
ther
3. The cables for each circuit must be bunched together to minimise the loop
4. area
enclosed
5. The cables for the pulsing output must use a twisted pair. Where the environment is
electrically hostile, screened twisted pair cable may be required. The screen must be
connected to earth at one point only
6. Ancillary equipment must also be CE marked
7. If interposing relays are used (a.c. or d.c.) then these must be correctly and adequately
suppressed
26.6 Fixing and Connection
WARNING
Installation must always be carried out by appropriately trained and qualified personnel in
accordance with normal metering custom and practice.
The installer is responsible for the choice of connecting cables which must be appropriate for the
voltage and current rating of the meter and for ensuring that the supply is properly fused. For
direct current meters, 25mm
2
cables are recommended. Meters must be protected by fuses equal
to the meter rating. i.e. 100A fuse for a 100A meter. Failure to do so may result in damage or fire.
Connections to the auxiliary voltage terminals will only be protected by the installation’s main fuse
cut-out. The installer must ensure that additional local protection is provided for any circuits
connected to these terminals.
Refer to the connection diagrams inside the terminal cover, paying particular attention to the
auxiliary terminal configuration.
Isolate all circuits before carrying out the installation.
Refer to the nameplate to ensure that the correct meter is being installed.
Failure to comply with these instructions may result in damage, fire and/or electric shock.
To mount the meter on the meter board
Remove the meter terminal cover.
Fix a 5mm dia. x 13mm long round headed wood screw into the meter board to accommodate the
keyhole fixing aperture at the back of the meter. Note that a choice of two fixing points is available
for the upper fixing screw (see figure 6). Leave the shank of the screw projecting from the board by
4.5 mm.
Hang the meter on the screw and align it to be vertical.
Secure the lower end of the meter to the board using two 5mm dia. x 13mm long round head
screws through the lower mounting holes in the area of the terminal chamber.
Tighten screws just sufficiently to prevent movement of the meter.