User's Manual

INSTALLATION
FIXED STATIONS
ENVOY™ TRANSCEIVER REFERENCE MANUAL 373
Wiring techniques
Correct wiring techniques can reduce voltage drop. These include choosing good
connection points and using terminal lugs correctly.
WARNING: It is essential for every mains-energised installation to have an
effective connection to the protective earth of the power distribution
system in case the basic insulation fails.
WARNING: Without protective earthing, dangerous voltages may be applied to
accessible metal parts.
A 3-wire mains cord has an earth wire that provides an effective earth, and is therefore
electrically safe. A 2-wire mains cord lacks a protective earth wire, so one must be
established by bonding the transceiver supply to an earth stake driven into the ground,
or to some other low-impedance earth connection.
Related links:
Connecting the AC mains supply on page 373
Connecting the power supply
Connecting the AC mains supply
An AC mains or a generator-based supply may be used as a direct source of power to
a transceiver power supply in a fixed station.
To connect an AC mains supply:
 Fit the plug from the transceiver supply into the AC mains socket.
The transceiver supply converts the AC power supply to DC.
 Connect the transceiver supply to the transceiver via the DC power leads.
 Ensure the transceiver is earthed correctly.
Most Codan power supplies can use an external battery as an alternative power supply
in the event of an AC mains failure. Codan recommends the use of the Standby Battery
Cable Kit (Codan part number 15-00702) for easy and correct installation of the
standby battery. The cable from this battery must be able to carry the full supply
current, so it must be of correct size.
Related links:
Earthing the transceiver in a fixed station on page 374
Power and control cabling on page 357