Grounding Survey
Once you have completed the Site Survey, perform a Grounding Survey as follows:
1. Check all mounting structures and surfaces to be used for equipment installation for
protection against lightning.
2. Check the grounding of all mounting structures and surfaces.
3. Check the distance between the lightning collectors and the location of the ODUs.
4. Record the above information.
5. Continue with the Grounding Survey and identify:
a. The best location to install the ODU. Avoid long ground wires to the pole
(ground bonding).
b. The best method for securing the ground wire to the ground bonding
(minimum impedance).
c. The best location to install the ODU so it is not the highest metal object on the
site.
d. Identify a location close to the ODU for the safe installation of an LPU.
6. Continue only after you verified that all equipment, mounting structures, and surfaces
are protected according to local and national regulations.
Air‐Termination System
To determine where to install equipment, and what, if any, extra equipment is needed to
protect the ODUs from lightning, you must design an "air‐termination system". Typically, an
air‐termination system can be designed using one of the following methods:
• Rolling sphere
• Mesh
• Protective angle
The rolling sphere method is recommended for geometrically complicated installations. For a
more detailed discussion of these methods, refer to the Lightning Protection Guide by Dehn
International
(www.dehn‐international.com).
An example of designing an air-termination system:
1. Take a composite 3D diagram (or use an actual model) of the installation
neighborhood. Example:
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