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Lightning Protection Systems Training

Lightning Protection Systems Training. Presented by. Systems Training Outline. Section 3 – Outline. Bonding.

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Lightning Protection Systems Training

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  1. Lightning Protection Systems Training Presented by

  2. Systems Training Outline

  3. Section 3 – Outline

  4. Bonding • An electrical connection between an electrically conductive object and a component of a lightning protection system that is intended to significantly reduce potential differences created by lightning currents. ref: NFPA 780 – 2008 Edition

  5. Bonding Conductor • A conductor used for potential equalization between grounded metal bodies or electrically conductive objects and a lightning protection system. ref: NFPA 780 – 2008 Edition

  6. Main Conductor • A conductor intended to be used to carry lightning currents between strike termination devices and grounding electrodes. ref: NFPA 780 – 2008 Edition

  7. Metal Framed Structure • A structure with electrically continuous structural members of sufficient size to provide an electrical path that is equivalent to lightning conductors. ref: NFPA 780 – 2008 Edition

  8. Metal Clad Structure • A structure that has sides or roof covered with metal. ref: NFPA 780 – 2008 Edition

  9. Side Flash • An electrical spark, caused by differences of potential between conductive metal bodies or between conductive metal bodies or between conductive metal bodies and a component of a lightning protection system ground. ref: NFPA 780 – 2008 Edition

  10. Fasteners • An attachment device used to secure the conductor to the structure. ref: NFPA 780 – 2008 Edition

  11. Section 3B – Components

  12. Down Conductors • Class I or Class II Copper or Aluminum conductors. • Structural Steel 3/16” thick or greater.

  13. Thru-Roof Connectors • Thru-roof or thru-wall connectors are to be used when penetrating roofs or walls because of the difficulty of sealing stranded lightning conductor cables.

  14. Fasteners • Cable Clips and Holders • Cable Guards

  15. Bonding Plates • When the structural steel is utilized as the down conductor, the bonding plate must have at least 8 square inches of bonding surface.

  16. Exothermic Connection • Prior to making an exothermic connection the surface must be cleaned to bare steel and free of any contaminates.

  17. Suggested Tools • Power Drill • Screwdriver • Hammer • Cable Cutters • Measuring Tape • Exothermic Tools if welding connections • Hard Hat, Gloves, Safety Glasses

  18. Suggested Tools • Ladder (6’ to 40’) • Optional lifts may be required • Grinder • Generator/Extension Cords

  19. Critical Points • If conduit is required to run down conductors, confirm it is being installed in the correct locations and that the openings are protected against foreign matter.

  20. Critical Points • Metallic conduit must be bonded to the lightning protection conductor at both extremities.

  21. Critical Points • All lightning protection conductors bends must have a 8 inch minimum radius bends.

  22. Critical Points • Conductors must maintain a horizontal or downward coursing free from “U” or “V” pockets. Not Allowed

  23. Critical Points • All structures require at least 2 down conductors and at least 1 additional down conductor for every 100 feet of perimeter over 250 ft.

  24. Critical Points • Down conductors coursed on or in reinforced concrete columns or on structural steel columns must be connected to the reinforcing steel or the structural steel member at their upper and lower extremities.

  25. Critical Points • Running down conductors in PVC conduit or other non-metallic chase does not eliminate the need to meet the required bonding requirements.

  26. Critical Points • Aluminum down conductors must transition to copper at a minimum of 18” above where they come into contact with earth. An approved bi-metallic connector must be used.

  27. Critical Points • Down conductors must not be installed in gutters or downspouts. • Aluminum conductors must not be installed in concrete or masonry. • Do not install Class I down conductors on portions of structures that are over 75 ft. tall.

  28. Critical Points • Using larger conduit for lightning protection conductors when bends are required, eases the pulling of the conductor. • It may be beneficial to install additional conduits in poured concrete columns in case one of the conduits becomes blocked.

  29. Summary • End of Section 3

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