Amendment 0006_Specification 26 41 00.pdf

SECTION 26 41 00

LIGHTNING PROTECTION SYSTEM

08/23

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 81 (2012) Guide for Measuring Earth

Resistivity, Ground Impedance, and Earth

Surface Potentials of a Ground System

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023; ERTA 1 2024; TIA 24-1) National

Electrical Code

NFPA 780 (2023) Standard for the Installation of

Lightning Protection Systems

U.S. AIR FORCE (USAF)

DAFMAN 32-1065 (2020) Grounding and Electrical Systems

U.S. DEPARTMENT OF DEFENSE (DOD)

UFC 3-575-01 (2012; with Change 1, 2021) Lightning and

Static Electricity Protection Systems

UL SOLUTIONS (UL)

UL 96 (2016; May 2023) UL Standard for Safety

Lightning Protection Components

UL 96A (2023) UL Standard for Safety Installation

Requirements for Lightning Protection

Systems

UL 467 (2022) UL Standard for Safety Grounding and Bonding Equipment

UL 1449 (2021; Reprint Dec 2022) UL Standard for

Safety Surge Protective Devices

UL Electrical Construction (2012) Electrical Construction Equipment

Directory

1.2 RELATED REQUIREMENTS

1.2.1 Verification of Dimensions

Confirm all details of work, verify all dimensions in field, and advise

Contracting Officer of any discrepancy before performing work. Obtain prior approval of Contracting Officer after engineering approval and before making any departures from the design.

1.2.2 System Requirements

Provide a system furnished under this specification consisting of the latest products of a manufacturer regularly engaged in production of lightning protection system components. Products must be UL listed for use on lightning protection systems unless this rating does not exist for items in question.

Comply with NFPA 70, NFPA 780, UL 96, and UFC 3-575-01.Provide lightning protection system as shown on project drawings for Magazines and AROS facility only.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for

Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Lightning Protection Quality Assurance Plan; G

SD-02 Shop Drawings

Overall lightning protection system; G

Each major component; G

Contractor Design; G

Detail Drawings; G

SD-06 Test Reports

Lightning Protection and Grounding System Test Plan; G

Lightning Protection and Grounding Systems Testing; G

SD-07 Certificates

Lightning Protection System Installers Documentation; G

Component UL Listed and Labeled; G

Lightning Protection System Inspection Certificate; G

Roof Manufacturer's Warranty; G

1.4 QUALITY ASSURANCE

In each standard referred to herein, consider the advisory provisions to be mandatory, as though the word "shall" or "must" has been substituted for

"should," wherever it appears. Interpret references that require LPS expertise in these standards to mean Base Civil Engineer (BCE) or

BCE-designated representative with LPS training certification.

A minimum of four (4) weeks before starting construction, submit the

Lightning Protection Quality Assurance Plan, immediately followed by a meeting to review the Lightning Protection Quality Assurance Plan. This meeting must be combined with the meeting for the Magazine Grounding and

Bonding system quality assurance plan. The meeting must include the DOR, KTR QC Manager, Special Inspector, lightning protection contractor, KTR superintendent, government CM, and a government representative familiar with LP systems for munnitions magazines. The plan shall include, but not be limited to:

a. The contractor's understanding and explanation of the QC process.

b. Special inspector qualifications and responsibilities.

c. Shop QC manager (or in-house inspector) qualifications and responsibilities.

d. A list of achallanging issues (available material challenges, shipping challenges, schedule challenges, etc.).

e. Special procedures and processes.

f. A discussion of SI record keeping and required bi-weekly submittals and any other submittals to the contractor's QC manager, etc.

g. Show coordination between SI inspector, in-house inspector, Shop QC manager, and KTSR QC manager.

1.4.1 Installation Drawings

1.4.1.1 Overall System Drawing

Submit installation shop drawing for the overall lightning protection system.

Include on the drawings the physical layout of the equipment (plan view and elevations), mounting details, relationship to other parts of the work, and wiring diagrams.

1.4.1.2 Major Components

Submit detail drawings for each major component including manufacturer's descriptive and technical literature, catalog cuts, and installation instructions.

1.4.2 Component UL Listed and Labeled

Submit proof of compliance that components are UL Listed and Labeled for use on lightning protection systems. Listing alone in

UL Electrical Construction, which is the UL Electrical Construction

Directory, is not acceptable evidence. In lieu of Listed and Labeled, submit written certificate from an approved, nationally-recognized testing organization equipped to perform such services, stating that items have been tested and conform to requirements and testing methods of Underwriters

Laboratories (UL).

1.4.3 Lightning Protection and Grounding System Test Plan

Provide lightning protection system and grounding system test plans in compliance with NFPA 780 Identify (by number or letter, at the preference of the base - 1.2.3. or a.b.c.) the system test points/locations along with a listing or description of the item to be tested and the type of test to be conducted. As a minimum, include a sketch of the facility and surrounding lightning protection system as part of the specific test plan for each structure. Include the requirements as "Testing of Mast Lightning

Protection System" in the test plan. For explosives facilities, the rolling sphere must be superimposed in elevation drawings, on all three of these types of lightning protection systems for installations with a high strike density as indicated in the NOAA Strike Density Maps. This may be accomplished by Computer Aided Design (CAD). Integral systems are discouraged on explosives and communications facilities because it has the potential to bring lightning closer to what is being protected. For explosives facilities, record drawings with materials description (wire size, air terminal material, etc.) is required by the base Weapons Safety

Office. Testing of Surge Protective Devices must comply with UL 1449 and annual inspection of Surge Protective Devices should be included on Figures

A7.6 and A7.7.

1.4.4 Lightning Protection System Inspection Certificate of Qualifications

Provide an approved third-party inspector who meets training certification requirements for final acceptance of the LPS. Inspection and certification of the LPS must be completed and certified in writing, before occupancy of the building. Compliance requirements are in UFC 3-575-01 Signed

Certificate of Qualifications must be placed in the LPS records.

Note that the Contracting Officer may not accept the LPS system without a recommendation from a qualified person identified in the project documents.

1.5 SITE CONDITIONS

Confirm all details of work, verify all dimensions in the field, and advise the Contracting Officer of any discrepancy before starting any work, if known at that time, or when it becomes known while performing work. Obtain prior approval of the BCE or BCE-designated representative with LPS training certification before design changes are made.

1.6 REBAR BONDING IN MAGAZINES

Reinforcing steel in walls, floor slab, and box structure must all be interconnected through bonding, and must have a continuous path to the primary grounding system. Mininum rebar overlap is 20x diameter (20d).

Metal ventilators, steel doors and door frames must be bonded to the primary grounding system. Submit photo documentation of the reinforcing steel bonding for each ceiling panel, wall panel, and floor slab.

PART 2 PRODUCTS

2.1 MATERIALS

See NFPA 70, NFPA 780, UFC 3-575-01. Do not use a combination of materials that forms an electrolytic couple of such nature that corrosion is accelerated in the presence of moisture unless moisture is permanently excluded from the junction of such metals. Where unusual conditions exist which would cause corrosion of conductors, provide conductors with protective coatings, such as tin or lead, or oversize conductors. Where a mechanical hazard is involved, increase conductor size to compensate for the hazard or protect conductors. When metallic conduit or tubing is provided, electrically bond conductor to conduit or tubing at the upper and lower ends by clamp type connectors or welds (including exothermic). All lightning protection components, such as bonding plates, air terminals, air terminal supports and braces, clips, connector fittings, and fasteners are to comply with the requirements of UL 96 classes, as applicable.

2.1.1 Main and Bonding Conductors

Main and Bonding Conductors should be NFPA 780 and UL 96 Class I or Class

II materials, as applicable. For explosives, Class II materials are in accordance with NFPA 780, Chapter 8.

2.1.2 Conductors

Provide copper or aluminum conductors, as applicable. See NFPA 780, UFC 3-575-01.

2.2 COMPONENTS

2.2.1 Air Terminals on Integral Systems

Provide solid air terminals with blunt tips. Tubular air terminals are not permitted. Support air terminals more than in length by suitable brace, supported at not less than one-half the height of the terminal.

2.2.2 Lightning Protection Masts

Provide 18m high metallic lightning protection mast. Top of metallic mast shall have minimum thickness of 4.8mm. Mast shall be electrically continuous and minimum 1.63mm wall thickness.

A rolling sphere diagram showing proof of protection is a required submittal that must be approved prior to sizing or ordering the masts.

This system shall comply with NFPA 780 and UFC 3-575-01.

2.2.3 Contractor Design and Detail Drawings

Submit contractor designed calculations for lightning protection mast for all structural elements. Mast must be designed for all load combinations generated from the Design Load Criteria as specified on sheet S001A.

Calculations must be approved, certified, stamped, and signed by a registered

Structural engineer verifying the capability of the mast to carry all loads to the foundation.Mast must also be designed for servicibility requirmeents.

Submit detail drwaings of mast with catalog cuts, templates, erection and installation details, anchorage,and connection to the supporting foundation.

Indicate thickness, type, grade, and dimensions

2.2.4 Ground Rods

Provide ground rods conforming to NFPA 780. Provide ground rods that are not less than 19mm in diameter and 2440mm in length. Provide ground rods of solid copper.

2.2.5 Connections and Terminations

Provide connectors for splicing conductors that conform to UL 96, class as applicable. Conductor connections can be made by compression clamps or welds (including exothermic). Provide style and size connectors required for the installation.

2.2.6 Connector Fittings

Provide connector fittings for "end-to-end", "Tee", or "Y" splices that conform to NFPA 780 and UL 96.

PART 3 EXECUTION

3.1 LIGHTNING PROTECTION SYSTEMS

Provide a lightning protection system that meets the requirements of

NFPA 780 and UFC 3-575-01.

3.1.1 Integral Lightning Protection System

The integral type lightning protection system consists of air terminals, roof conductors, down conductors, ground connections, grounding electrodes and ground ring electrode conductor for the purpose of carrying lightning current from a direct strike to ground in a manner that will protect assets and personnel. Expose all conductors on the structures except where exterior down conductors are required to be in protective sleeves for prevention of mechanical damage (above grade level). Integral systems are the least preferred, especially for explosives and communications facilities. When use of integral systems is determined by the designer or site conditions to be necessary, do not run down conductors inside columns or other methods which will prevent visual access for required inspections. Visual access is required by NFPA 780 so that the annual visual inspection may be performed on all LPS components.

Make interconnections within side-flash distances between down conductors and metallic equipment mounted on the exterior or interior of a facility, at or below the level of the grounded metallic parts. Calculate side-flash distances in accordance with NFPA 780. Be aware of side flashes that may occur through exterior walls.

Note that integral systems should be avoided as LPS for Explosives and

Communications facilities and is discouraged for general facilities.

Installation and maintenance costs of an integral system are excessive and this method is maintenance intensive. The complexity and number of test points dictates frequent interruption to missions and daily operations for required annual inspections and testing. Integral systems require fall protection and maintenance of that fall protection system. For fall protection, maintain NFPA 780-compliant separation distance between the integral system and metallic fall protection.

3.1.1.1 Roof-Mounted Components

Coordinate with the roofing manufacturer and provide certification that the roof manufacturer's warranty is not violated by the installation methods for air terminals and roof conductors. Adhesive fasteners may be used on the roof if the installation is observed by base-qualified personnel to be compliant with manufacturer's instructions. Installation must be observed until the observer is satisfied that the proper methods for preparing the surface are being performed. These fasteners will be added and considered a test point in Base records and must be part of the annual inspection.

Observer must date and sign the test record.

No connection or physical attachment is allowed to any coping system on the roof as this violates the integrity and warranty of the coping system.

3.1.1.2 Air Terminals

Use of adhesive fasteners, when installing air terminals on "rubber" (EPDM) type roofs, should be in accordance with adhesive and roof manufactures’ recommendations. See paragraph ROOF-MOUNTED COMPONENTS.

3.1.1.3 Roof Conductors

Roof conductors should comply with NFPA 780.

3.1.2 Mast Lightning Protection System

A mast lightning protection system consists of one or more individual masts not interconnected to each other, and isolated from the building, that provide sufficient protection for the structure contents. These masts are metallic. The base of a metallic mast should have connections to two separate ground rods within test wells, 19mm by 2440mm. Paths to ground must possess a visible test point.

3.1.3 Down Conductors

A minimum of two paths to ground shall be provided on any system. This may be by two down conductors or with a down conductor in combination with other metallic connections to ground. Protect exposed down conductors from physical damage from ground level up to 1830mm. If this protection is a metal conduit, both ends must be bonded to the down conductor passing through it. For Schedule 80 conduit providing this protection, no bonding at both ends is necessary. Schedule 80 conduit or metallic conduit may be painted to match the surrounding surface. NO CONNECTIONS OR FASTENERS OF

ANY LIGHTNING PROTECTION SYSTEM MAY BE PAINTED because this affects the ease with which lightning current can pass to ground.

3.1.4 Ground Connections

Attach each down conductor and ground ring electrode to a ground rod below grade by exothermic weld for all buried connections and exothermic weld or compression connectors for connections inside test wells. Terminate all down conductors to a grounding electrode inside a test well. Test connections and record resistances and continuity readings prior to covering.

Accessible connections above ground level and in test wells can be grounded with mechanical clamping, meeting installation requirements in NFPA 780.

3.1.5 Installation of Grounding Electrodes (Ground Rods)

Extend driven ground rods vertically into the existing undisturbed earth for a distance of not-less-than 2440mm if exothermic welds are used for bonds. Inside test wells, the 19mm by 2440mm rod may be driven to a point above the base of the test well, that will provide working/testing access to the mechanically-fastened bond. Set ground rods not less than 915mm nor more than 1830mm (see NFPA 780) from the structural foundation, and at least

915mm beyond the drip line for the facility. After the completed installation, measure the total resistance to ground using the fall-of-potential method described in IEEE 81. Maximum allowed resistance of a single driven ground rod is 25 ohms (NFPA 70). If resistance-to-ground of a single ground rod for the lightning protection system exceeds 25 ohms and another ground rod is driven in accordance with

NFPA 780, 25 ohms does not apply to this test point. See NFPA 70 exception to Article 250.53.

For explosives facilities: For a ground ring electrode, provide continuous

No. 2/0 (minimum) bare stranded copper cable (NFPA 780-2023, Chapter 8, Explosives Facilities).

3.2 APPLICATIONS

3.2.1 Personnel Ramps and Covered Passageways

Lightning Protection is required in accordance with NFPA 780 and

UFC 3-575-01.

3.3 FIELD QUALITY CONTROL

3.3.1 Lightning Protection Systems Testing

A 100 percent test point test and inspection is required by all services.

Identify test points for lightning protection system connections and bonds. Provide a sketch (NTS) with identified test points as part of the contract acceptance. Number points in a manner consistent with the installation (Base or Post) nomenclature for existing lightning protection systems; for example, use letters or numbers to track the test results.

Test each lightning protection system connection to ensure continuity across each connection or bond is 1 ohm or less, and record the value.

<OLG>

<OLI>LPS testing must also be accomplished on smaller projects, such as roofing and HVAC projects, where lightning protection systems are installed on any facility with existing LPS, to ensure the LPS is not damaged or reconfigured during construction.</OLI>

<OLI>Comply with UL 96A. A third-party inspector (not the designer and not the installer) must be present for the 100 percent inspection and data documentation by the contractor. This is to take place prior to project acceptance.

3.3.2 Grounding Systems Testing

A 100 percent test point resistance test and inspection is required.

Identify all test points for grounding system connections and bonds.

Provide a sketch (NTS) with identified test points as part of the contract acceptance. Number points in a manner consistent with the installation

(Base or Post) nomenclature for existing grounding systems; for example, use letters or numbers to track the test results. Test each grounding system connection or bond to ensure resistance-to-ground is 25 ohms or less or as excepted by NFPA 70 or NFPA 780. Record the resistance measurement on a copy of the test form located at the back of DAFMAN 32-1065 for Air

Force or a similar form provided by the Army or Navy. Test the ground rod for resistance to ground before making connections to the rod. Tie the grounding system together and test for resistance to ground. Make resistance measurements in dry weather, and not earlier than 48 hours after rainfall. Include in the written report: locations of test points, measured values for continuity and ground resistances, and soil conditions at the time that measurements were made. Submit results of each test to the Contracting Officer.

-- End of Section --