VA 26 41 00-2009 FACILITY LIGHTNING PROTECTION.pdf
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1、4-09 26 41 00 - 1 SECTION 26 41 00 FACILITY LIGHTNING PROTECTION SPEC WRITER NOTE: Delete between /-/if not applicable to project. Also delete any other item or paragraph not applicable to the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION This section specifies the furnishing
2、 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 07 60 00, FLASHING AND SHEET METAL: penetrations through the roof. B. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical req
3、uirements that are common to more than one section of Division 26. C. 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. SPEC WRITER NOTE: Bonding buried steel to buried copper co
4、nductors and ground rods sets up a galvanic cell which will corrode the steel. Coordinate specification of Lightning Protection System with the Cathodic Protection System. D. Section 26 42 00 CATHODIC PROTECTION: Requirements for protection of buried ferrous equipment from galvanic corrosion. 1.3 QU
5、ALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 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
6、 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 is a certified Lighting Protection Institute (LPI) installer, and has had suitable and adequate
7、experience installing other Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 41 00 - 2 lightning protection systems, and is capable of installing the system as recommended by the manufacturer of the equipment. D. Certification: Two weeks prior
8、 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 bee
9、n approved by UL without variation. 1.5 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. B. National Fire P
10、rotection Association (NFPA): 70National Electrical Code (NEC) 780.Standard for the Installation of Lightning Protection Systems C. Underwriters Laboratories, Inc. (UL): 96Lightning Protection Components 96A.Installation Requirements for Lightning Protection Systems UL 467 .Standard for Grounding an
11、d Bonding Equipment PART 2 - PRODUCTS 2.1 MATERIALS A. Attach master labels 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 compo
12、nent material requirements are as follows: 1. Conductors: Electrical grade copper. Conductors shall be in accordance with NFPA 780 and UL 96 for Class I, Class II, or Class II modified materials as applicable. 2. Air terminals: Solid copper, /18/ / / inches long, not less than 3/8 inch 9mm diameter,
13、 with sharp nickel-plated points. 3. Ground rods: /Copper clad steel/ /steel/ /stainless steel/ /solid copper/, not less than 1/2 inch 13mm diameter by 8 feet 2400mm long. Rods made of copper-clad steel shall conform to UL 467 and galvanized ferrous rods shall conform to IEEE C135.30. Ground rods of
14、 copper-clad steel, steel, stainless steel, galvanized ferrous, and solid copper shall not be mixed on the project. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 41 00 - 3 SPEC WRITER NOTE: Designer will determine type and number of ground
15、rods to be used; based on local conditions, earth resistivity data, and on the size and type of the electrical installation. Copper clad steel rods will typically be specified for normal conditions. Galvanized coated steel or stainless steel rods will be typically used where low soil resistivities a
16、re encountered and galvanic corrosion may occur between adjacent underground metallic masses and the copper-clad rods. Stainless steel rods have a longer life than the zinc coated steel, but use must be justified based on the higher cost. In high resistivity soils, 3.048 m (10 foot) sectional rods m
17、ay be used to obtain the required resistance to ground; however where rock is encountered, additional rods, a counterpoise, or ground grid may be necessary. Coordinate and standardize rod selection for individual facilities with other specification sections. 4. Ground plates: Solid copper, not less
18、than 1/16 inch 2mm thick. 5. Tubing: Stiff copper or brass. C. Anchors and fasteners: Bolt type which are most suitable for the specific anchor and fastener installations. Clamp-type connectors for splicing conductors shall conform to UL 96, class as applicable, and, Class 2, style and size as requi
19、red for the installation. Clamp-type connectors shall only be used for the connection of the roof conductor to the air terminal and to the guttering. All other connections, bonds, and splices shall be done by exothermic welds or by high compression fittings. The exothermic welds and high compression
20、 fittings shall be listed for the purpose. The high compression fittings shall be the type which require a hydraulically operated mechanism to apply a minimum of 10,000 psi. PART 3 - EXECUTION 3.1 INSTALLATION A. Installation shall be coordinated with the roofing manufacturer and installer. B. Insta
21、ll the conductors as inconspicuously as practical and with the proper bends. C. 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 buildin
22、g or stack perimeter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 41 00 - 4 D. Make connections of dissimilar metal with bimetallic type fittings to prevent electrolytic action. E. Use the exothermic welding type connections that form sol
23、id metal joints in the main vertical and horizontal conductors, and for connections that are not exposed in the finish work. F. Protect copper conductors with stiff copper or brass tubing, which enclose the conductors from the top to the bottom of the tubing, between one foot 300mm below and seven f
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