User guide

Canopy System User Guide Grounding the Equipment
pmp-0229 (Mar 2013)
177
The Recommended Separation Distance provides significant compliance margin in all cases. To
simplify exposure distances in this column, a module has the expressed separation distance
regardless of whether it is retrofitted with a reflector or a LENS.
These are conservative distances:
• They are along the beam direction (the direction of greatest energy). Exposure to the sides and
back of the module is significantly less.
• They satisfy sustained exposure limits for the general population (not just short term
occupational exposure limits), with considerable margin.
• In the reflector cases, the calculated compliance distance d is greatly overestimated because
the far-field equation models the reflector as a point source and neglects the physical
dimension of the reflector.
Grounding the Equipment
Effective lightning protection diverts lightning current safely to ground, Protective Earth (PE) . It
neither attracts nor prevents lightning strikes.
WARNING!
Lightning damage is not covered under the warranty. The
recommendations in this guide give the installer the knowl
edge to protect
the installation from the harmful effects of ESD and lightning.
These recommendations must be thoroughly and correctly performed.
However, complete protection is neither implied or possible.
Grounding Infrastructure Equipment
To protect both your staff and your infrastructure equipment, implement lightning protection as
follows:
• Observe all local and national codes that apply to grounding for lightning protection.
• Before you install your modules, perform the following steps:
o Engage a grounding professional if you need to do so.
o Install lightning arrestors to transport lightning strikes away from equipment. For
example, install a lightning rod on a tower leg other than the leg to which you mount your
module.
o Connect your lightning rod to ground.
o Use a 600SS Surge Suppressor on the Ethernet cable where the cable enters any structure.
(Instructions for installing this surge suppressor are provided in Procedure 22 on Page
398.)
• Install your modules at least 2 feet (0.6 meters) below the tallest point on the tower, pole, or
roof.