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Maxwell Lightning Protection Co.

» Project Specifications: Buildings < 75' Copper Equipment


Provide a complete Lightning Protection System as shown on the drawings and as specified herein. This system shall be installed by a firm actively engaged in the installation of Master Labeled Lightning Protection Systems a minimum of five (5) years shall be listed by Underwriters Laboratories, such as Maxwell Lightning Protection Company, 621 Pond Street, Dayton, OH 45402, (513) 228-7250, or 1-800-872-1657.

The completed system shall comply with the latest edition of the Installation Requirements for Master Labeled Lightning Protection Systems U.L. 96A and the National Fire Protection Association Lightning Code - N.F.P.A. 780, Lightning Protection must be L.P.I. - certified and in good standing and so certified.

All materials used in this installation shall be labeled or listed by Underwriters Laboratories, Inc. for use in Master Labeled Lightning Protection Systems. The catalog numbers referred to on the drawings and herein are those of EAST COAST LIGHTNING PROTECTION, MAXWELL LIGHTNING PROTECTION COMPANY or THOMPSON LIGHTNING PROTECTION.

Air Terminals shall project a minimum of ten (10) inches above the objects protected and shall be located at intervals not exceeding 20' 0" along ridges and around the perimeter of flat roof or gently sloping roofs. Flat or gently sloping roofs exceeding 50' 0" in width shall be provided with additional air terminals at intervals not exceeding 50' 0" on the flat or gently sloping area. Air terminals shall be located within 24 inches of the roof edge and outside corners of the protected area.

Air terminals shall be provided for metal stacks, flues and mechanical equipment having a metal thickness of less than 3/16" and not within a zone of protection of an air terminal. Equipment with metal thickness 3/16" or greater shall be bonded per code requirements.

Air terminals shall be, 3/8" X 12" (or longer as required) solid copper using air terminal bases of cast bronze construction.

Main size conductors on the roof shall be No. 29, Class I copper lightning conductor consisting of 29 strands of 17 AWG copper wire weighing 190 lbs. per 1000 feet.

All secondary bonding conductors shall be No. 14, secondary bonding conductor consisting of 14 strands of 17 AWG copper wire.

All down conductors shall be No. 29, Class I copper lightning conductor. Down conductors shall be concealed in exterior wall construction.

Note: Buildings over 60' require a conductor counterpoise cable of 29/17 copper to meet N.F.P.A. code requirements for this project.

All roof penetrations shall be made using a conduit sleeve passing through a pitch pocket. The pitch pocket shall be installed by the roofing contractor. The roofing contractor must include all additional expenses for this additional work. Any roof pads or roof stripping must be supplied and installed by the roofing contractor, at the roofing contractors expense, to maintain the roof warranty.

Common grounding of all ground mediums within the building shall be ensured by connection to cold water piping or by direct bonding using main size conductors and fittings.

Metal bodies of conductance (metal bodies with a metal thickness of 3/16" or greater and not located within the zone of protection of an air terminal) shall be bonded using main size conductors and fittings per code requirements.

Metal bodies of inductance (metal bodies located within 6' 0" of the lightning protection system) shall be bonded to the system using secondary bonding conductors and fittings unless inherently bonded through construction to another bonded metal body.

Ground electrodes shall be No. 5810, 5/8" X 10' long copper clad ground rods located as shown on the drawings. Down conductors shall be connected to the ground rods using exothermic weld connections.

Structural steel may be substituted for down conductors. Ground main steel columns and average of 60' using Class II material. Roof penetrations from steel to perimeter cables at 100', per U.L. 96A, L.P.I. 175, and N.F.P.A. 780. Use exothermic weld to all steel connections.

Upon completion of the installation the contractor shall deliver to the owner the Master Label issued by Underwriters Laboratories, Inc. for this system. If the new addition connects to an existing building that is not protected or brought up-to-date a U.L. Letter of Findings must be obtained, at the lightning protection contractors expense.

Note: Surge Arresters at the main electrical panel are not included under our scope of work. This must be installed and supplied by the Electrical Contractor.

Drawings shall be submitted for approval before delivering material and beginning work. Drawings to show number of points, size locations, conductor routes and size, grounding and details of connectors. Catalog data for all items of material used shall be submitted.

Lightning protection contractor shall submit his Underwriters Laboratories listing number, along with a copy of ten successful U.L. inspection certificates and their identification numbers installed in the last five years. Contractor must show proof of insurance and must be substance to be bonded.


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Before hiring an lightning protection company, verify that the installer is UL Listed. Call the Follow-Up Services department at UL's office:

333 Pfingsten Road
Northbrook, IL 60062
(847) 272-8800