The design and details shown will meet the requirements of Underwriters Laboratory Code 96A, National Fire Protection Association Code 780 and the Lightning Protection Institute Code 175 for Lightning Protection Systems.

  1. Conductor bend shall not form a sharper angle than 90 degrees or have a radius less thatn 8 inches.
  2. Metal bodies of inductance located within 6′ of a main lightning conductor shall be bonded to the lightning protection system. (Including metal vents, flashing, louvers and roof drains.)
  3. Connections to ground and/or counterpoise shall be made at a point not less than 1′–0 below grade, and 2′–0 away from foundation wall.
  4. Air terminal shall be placed at the locations indicated, not more than 2′–0 from the ends of ridges, outside corner, or outside edges of main roofs and must extend a minimum of 10″ above the the object to be protected.
  5. Midroof air terminals shall be spaced at 50′–0″ O.C. maximum spacing.
  6. Job conditions may dictate slight variations in air terminal and ground rod locations.
  7. Conductors shall maintain a horizontal or downward path free from “U” and “V” pockets. Any rise in horizontal conductor shall not exceed 8 inches.
  8. Cable may rise upwards at a rate of 3″ or rise per 1′–0″ run maximum.
  9. Copper lightning protection materials shall not be a placed on aluminum surfaces, nor shall aluminum materials be placed on copper surfaces.
  10. For the sake of clarity we have not called out each individual item of lightning protection materials on the roof plan. We have shown typical details and have called out each of these details on the roof plan, only in scattered locations.
  11. All structural steel, rebar, framing and miscellaneous steel shall be made electrically continuous through construction (not the responsibility of the lightning protection contractor).
  12. Electric, telephone, and antenna system grounds shall be connected with main sized conductor to one lightning protection ground or metal water pipe.
  13. A lightning arrestor, protector, or antenna-discharge unit must be installed on each electric and telephone service entrance and radio and television antenna lead in. (To be provided by electrical contractor.)
  14. All adhesive fixtures shall be set with an adhesive compound compatible with the roofing material. Adhesives shall be approved in advance by the roofing contractor.
  15. Bond all metal pipes such as water, gas, fire, storm, sewer which enter the structure to the nearest downlead, ground rod or counterpoise.
  16. Cable will be fastened every 3′–0″ O.C. maximum spacing.
  17. Perimeter and ridge air terminals 10″ to 23″ will be spaced up to 20′ maximum. Air terminals 24″ and over will be spaced 25′ maximum.

Contact Us with any questions about the installation of your project – we’ll be glad to advise you.