iRelay 460 Equipment Installation Guide
UGD-D01035
Airspan Commercial and Internal Use
19
3 Connecting and Managing the Cables
3.1 Fitting the Protection Earth Cable
1. Connect an earthing cable to the screw fixing point on the main body casting of iR460.
The earthing cable must be connected to a protection ground bar or clamped directly to the
steel structure of the power or pole. Typically, protective earthing is required in areas of high
lightning activity or when the iR460 unit is mounted on high, exposed roofs or tower
structures.
For the surge protection devices inside the iR460 unit to be effective, a direct earth
connection is required. The earthing cable must be kept as short as possible (typically 0.6m)
and the cable must be positioned downwards leading away from iR460, avoiding any sharp
bends. (The earthing lugs and screws are supplied in the IRM kit.)
Figure 16:
iR460 with Earthing Connection
2. Connect the earth cable to the protection earth bar using suitable crimp lugs. Alternatively,
use a clamp to join the earth cable to the steel structure of the mounting pole or tower
structure (see
Figure 17
).
Note:
Airspan does not supply the clamp required for this connection. Depending on the
tower structure, choose an appropriate clamp.
Figure 17:
Attaching the Earth Cable to the Pole
Important:
To avoid or minimize galvanic corrosion, when installing a protection earth be
sure to use the suitable metal combinations. See
Figure 18
. Avoid combinations above the