ERICO ISODC Isolated Downconductor System - Manual (Page 16)

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The Lightning Event Counter (LEC) is a device for registering and recording the number of strikes intercepted. The LEC should be
mounted in a secure area that is not prone to contact by moving items, theft or vandalism. However, it should be mounted in a
location that allows safe access to inspect the display. Refer to instructions supplied with the LEC.
The LEC is fixed to the Isolated Downconductor, and does not require additional fixing to the structure. Additional downconductor
fixings should be installed directly above and below the LEC counter.
10. TESTING AND MAINTENANCE
Ice loading, wind and other vibration sources can loosen mechanical and electrical connections over time. Atmospheric pollution can
accelerate corrosion. Therefore, the Isolated Downconductor system should be visually inspected by a lightning protection specialist
annually. Electrical tests should be conducted every 2 years.
Visual inspection should ascertain that:
• System conforms to the design standard (IEC 62305) and requirements of this instruction.
• Structure or equipment changes have not affected the design.
• All components are secure and in good condition.
Special attention should be given to:
• Mast mounting brackets.
• Isolated Downconductor sheath to ensure it has not suffered inadvertent mechanical damage.
• ISODC primary equipotential bond connection is securely connected to structure.
Electrical testing should include:
• Continuity test of the complete system.
• Earth resistance measurement.
• The upper and lower cable termination integrity can be tested by temporarily isolating the lower termination adapter from
ground/structure. Using an Ohm meter measure between the lower termination adapter and ground/structure. Resistance
should be between 700 and 2000 Ohms.
11. UPPER TERMINATION PROCEDURE
The ISODC upper termination is normally preinstalled by the factory. If however, this needs to be field fitted then follow the procedure
supplied with the termination kit. Note that this termination procedure is different to that of the lower termination adapter.
9. LIGHTNING EVENT COUNTER