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TimeSource 3100 31
Engineering and Ordering
097-72020-01 Issue 9: November 2003
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Lightning Suppressor Guidelines
• Mount the lightning suppressor within 4.6 meters of a valid, direct, low impedance,
low resistance, earth ground connection point. Valid earth grounds include the roof
ring ground system, building structural steel, or a Central Office ground plate. If the
grounding point is inside the building, mount the suppressor within 15 meters of the
cable entry into the building.
Warning: Metal clamps that form a complete metal circle around the antenna cable or
the cable conduit are not allowed. The ring clamp acts like a choke coil to induce
currents, which resists current flow and hampers proper lightning protection.
Warning: Place the lightning suppressor away from electrical devices or cabling that
may induce arcing.
Note: Keep all impedances as low as possible, otherwise the grounding scheme may be
defeated.
• Route the ground wire as straight as possible (bends in the ground wire increase
impedance at lightning frequencies), in accordance with local company practices.
• Treat all exposed connections with an electrically conductive anti-corrosion
compound (Kopr-Shield or equivalent).
Warning: Avoid small-radius turns and unnecessary turns.
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