Motorola PTP 500 Installation Guide download pdf (Page 15)

3. Grounding and lightning protection PTP 500 Installation Guide

phn-2508_005v000 (Mar 2013)

Page 12

Mast or tower installation

For mast or tower installations, the following additional requirements must be met:

• The equipment must be lower than the top of the tower or its lightning air terminal.

• The metal tower or mast must be correctly grounded.

• A grounding kit must be installed at the first point of contact between the drop cable

and the tower, near the top.

• A grounding kit must be installed at the bottom of the tower, near the vertical to

horizontal transition point, bonded to the tower or its ground bar (TGB).

• If the tower is greater than 61 m (200 ft) in height, an additional grounding kit must

be installed at the tower midpoint and as necessary to reduce the distance between

ground kits to 61 m (200 ft) or less.

• In high lightning prone geographical areas, additional ground kits should be

installed at spacing between 15 to 22 m (50 to 75 ft). This is especially important on

towers taller than 45 m (150 ft).

A schematic example of a mast or tower installation is as follows:

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