264100 lightning protection.pdf

Bay Pines VA Healthcare System Ambulatory Surgeryt Center VA Project Number 516-334 Construction Documents-3, July 7, 2009

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SECTION 26 41 00

FACILITY LIGHTNING PROTECTION

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing and installation of a complete master labeled lightning protection system, complying with NFPA 780, UL

96 and UL 96A.

1.2 RELATED WORK

A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements that are common to more than one section of

Division 26.

B. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS:

Requirements for personnel safety and to provide a low impedance path to ground for possible ground faults.

1.3 SUBMITTALS

A. In accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL

INSTALLATIONS, submit the following:

B. Shop Drawings:

1. Isometric and plan views showing layout and connections to the required metal surfaces.

2. Show the methods of mounting the system to the adjacent construction.

C. Qualifications: Submit proof that the installer of the lightning protection system has had suitable and adequate experience installing other lightning protection systems, and is capable of installing the system as recommended by the manufacturer of the equipment.

D. Certification: Two weeks prior to final inspection, submit four copies of the following certifications to the Resident Engineer:

1. Certification that the lightning protection system has been properly installed and tested.

2. Certification that the lightning protection system has been inspected by a UL representative and has been approved by UL without variation.

1.4 APPLICABLE PUBLICATIONS

A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by designation only.

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B. National Fire Protection Association (NFPA):

70-02...................National Electrical Code (NEC)

780-00..................Standard for the Installation of Lightning

Protection Systems

C. Underwriters Laboratories, Inc. (UL):

96-94...................Lightning Protection Components

96A-01..................Installation Requirements for Lightning

Protection Systems

PART 2 - PRODUCTS

2.1 MATERIALS

A. Attach master labels "A" or "B" to each item by its manufacturer as evidence that the materials have been manufactured in conformance with the UL Standards for master label lightning protection materials.

B. In additional to conformance to UL 96, the component material requirements are as follows:

1. Conductors: Electrical grade copper.

2. Air terminals: Solid copper, not less than 9 mm (3/8 inch) diameter, with sharp nickel-plated points.

3. Ground rods: Copper clad steel, not less than 13 mm (1/2 inch) diameter by 2400 mm (8 feet) long.

4. Ground plates: Solid copper, not less than 2 mm (1/16 inch) thick.

5. Tubing: Stiff copper or brass.

C. Anchors and fasteners: Bolt type which are most suitable for the specific anchor and fastener installations.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install the conductors as inconspicuously as practical and with the proper bends.

B. Install the vertical conductors within the concealed cavity of exterior walls. Run the conductors to the exterior at elevations below the finished grade and make the ground connections to the earth outside of the building or stack perimeter.

C. Make connections of dissimilar metal with bimetallic type fittings to prevent electrolytic action.

D. Use the exothermic welding type connections that form solid metal joints in the main vertical and horizontal conductors, and for connections that are not exposed in the finish work.

E. Protect copper conductors with stiff copper or brass tubing, which enclose the conductors from the top to the bottom of the tubing, between

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300 mm (one foot) below and 2100 mm (seven feet) above the finished grade.

F. Sheath copper conductors, which pass over cast stone, cut stone, architectural concrete and masonry surfaces, with not less than a 2 mm

(1/16 inch) thickness of lead to prevent staining of the exterior finish surfaces.

G. For the earth connections, install ground rods and ground plates, and the conductor connections to them and the main water pipes in the presence of the Resident Engineer. For the conductors located outside of the building or stack, install the conductors not less than 600 mm (two feet) below the finished grade.

H. For structural steel buildings, connect the steel framework of the buildings to the main water pipe near the water system entrance to the building.

I. Connect exterior metal surfaces, located within 900 mm (three feet) of the lightning protection system conductors, to the lightning protection system conductors to prevent flashovers.

J. Grounding: Test the ground resistance to earth by standard methods and conform to the ground resistance requirements specified in Section 26 05

26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS.

K. Where shown, use the structural steel framework or reinforcing steel as the main conductor:

1. Weld or bond the non-electrically-continuous sections together and make them electrically continuous.

2. Verify the electrical continuity by measuring the ground resistances to earth at the ground level, at the top of the building or stack, and at intermediate points with a sensitive ohmmeter. Compare the resistance readings.

3. Connect the air terminals together with an exterior conductor connected to the structural steel framework at not more than 18000 mm

(60 foot) intervals.

4. Install ground connections to earth at not more than 18000 mm (60 foot) intervals around the perimeter of the building.

5. Weld or braze bonding plates, not less than 200 mm (eight inches) square, to cleaned sections of the steel and connect the conductors to the plates.

6. Do not pierce the structural steel in any manner. Connections to the structural steel shall conform to UL Publication No. 96A.

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L. For smoke stacks, the following additional requirements shall apply:

1. Extend air terminals from approximately 900 mm (three feet) below the top of the smoke stacks to approximately 900 mm (three feet) above the top of the stacks.

2. Securely seat and rivet the vertical conductors into bronze cable connectors. Cross-connect the vertical conductors at approximately the midpoint between the top and bottom of the smoke stacks.

M. When the lightning protection systems have been installed, have the systems inspected by a UL representative. Obtain and install a UL numbered master label "C" for each of the lightning protection systems at the location directed by the UL representative and the Resident

Engineer.

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