NFPA 780-2008 雷电保护系统的安装标准

NFPA Technical Committee Document Proposal NOTE All Proposals must be received by 500 pm EST/EDST on the published Proposal Closing Date. For further ination on the standards-making proces NFPA Technical Committee Document Proposal NOTE All Proposals must be received by 500 pm EST/EDST on the published Proposal Closing Date. For further ination on the standards-making proceSequence of Events Leading to Issuance of an NFPA Committee DocumentStep 1 Call for Proposals Proposed new Document or new edition of an existing Document is entered into one of two yearly revision Shrouds .................................................... 8.4.2.8, 8.4.2.9 Ordinary structures ........................ 4.18, A.4.18.1 to A.4.18.8780–58 INSTALLATION OF LIGHTNING PROTECTION SYSTEMS-L- -N-780–57INDEXCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permitted without license from IHS--,,,,,,-Potential equalization ............................................. 4.20 Flat roofs ........ Fig. 4.1.2, 4.7.11, Fig. 4.7.2.3a, 4.8.1B, 4.8.2.4,780–56 INSTALLATION OF LIGHTNING PROTECTION SYSTEIndexin thereproducedCablesConnected to aircraft ............................................. I.1.7Bonding ....................................................... 8.4.5.2Connections .................O.1.2 Other Publications. ANSI/IEEE C62.45, IEEE Recommended Practice on Surge Testing780–54 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS standard. The placement of air terminals on parts of the wind voltages be used. Otherwise, the SPD can conduct current dur-780–53ANNEX OCopyright National Fire Protection Association Provided by IHS u1 Dwellings or other buildings that are protected against M.3.1 One should remain inside a closed boat, as far as prac-780–52 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire ProtAeCollective Area for a Structure Where a Prominent Part En-compasses All Portions of the Lower Part of the Structure.Isolated structure, no other structureslocated within a distance of 3H1Isolated stFlash Density780–50 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permit1989–1994Avg. VermontLightningFl. Densityfl./km2/yr.2780–49ANNEX LCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking peTable L.1.2 Damage by Occupancy UseConsequenceinstallations；limitedorfailurealarmof life,electronicof feedflammables,computercultural780–48 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright NatioK.5.4 Magazines. K.7.3 Electrical 14-Month Test. The lightning protection780–47ANNEX LCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproductAnnex K Protection of Structures HousingK.4 Grounding.780–46 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANot for RH.1.2 The loss of livestock due to lightning during thunder- grounding receptacles to permit interconnection of metal780–45ANNEX JCopyright National Fire Protection Association Provided by IHS under lF.2.5 Grounding Electrodes. Grounding electrodes for con- structural steel framework and its lower inductive reac-780–44 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection I780–43ANNEX FCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permitted without license from IHSThree-point ground res3 Continuity tests to determine if suitable equipotential 5 Inspection, testing, or both of surge suppression devices780–42 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire ProtTable C.2.3 Sample Calculations of Bonding Distancesin.in.in.780–41ANNEX DCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networknecessary to equalize potentials by bonding grounded metal bod- higher the lightning current, the higher the magnetic field.780–40 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Ptem components can be built in so as to be protected from B.4.6 Where practicable, each grounding electrode connec-780–39ANNEX CCopyright National Fire Protection Association Provided by IHS under licThese fields are not as strong on flat surfaces as they are on edges780–38 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license withcan be expected. The metallic path should be continuous ment and propagation, empirical observations over hundreds780–37ANNEX BCopyright National Fire Protection Association Provided by IHS under liceρEquating resistances for a copper conductor of area ACu,780–36 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANot foA.4.20.1 For structures 18 m 60 ft or less in height, a loop floating roofs and seals with vapor spaces below the flexible780–35ANNEX ACopyright National Fire Protection Association Provided by IHS Three s of analysis are commonly used for this de- though this is usually achieved by the L–N modes across two780–34 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire ProtectioA.4.15.4.1 It is preferable that grounding electrodes be lo-Outside zone Inside zone780–33ANNEX ACopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo Annex A Explanatory MaterialA.3.3.6 Combination Wave Generator. For the open-780–32 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under8.4.3.2 The loop conductor shall be connected to at least one 8.4.6.2* Connecting fittings made of metals other than alumi-780–31PROTECTION FOR WATERCRAFTCopyright National Fire Protection Associationm 50ft.]780–30 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permittedC Isolated metal parts shall be bonded as required by Sec- 8.2.2.4* Carbon fiber composite CFC is not permitted to be780–29PROTECTION FOR WATERCRAFTCopyright National Fire Protection Association PB Sideflash distance from a catenary shall be calculated as 7.4 Protection of Specific Classes of Structures.780–28 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Ass7.3.3.7 Overhead Ground Wire.75Rolling780–27PROTECTION FOR STRUCTURES CONTAINING FLAMMABLE VAPORS, GASES, OR LIQUIDSCopyright National Fire Protection Association Provided by IHS under license with NF7.1.1.2 For the purpose of this chapter, the term structure 7.3 Protective Measures.head780–26 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IH6.4.2 Down Conductors. 6.8.1.2 TopLevelofStack. All interior and exterior grounded780–25PROTECTION FOR STRUCTURES CONTAINING FLAMMABLE VAPORS, GASES, OR LIQUIDSCopyright National Fire Protection Assocmaterial, and to the lightning protection system loop conduc- 6.2 Materials.780–24 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under licehA If a b is less than the calculated bonding distance, then780–23PROTECTION FOR MISCELLANEOUS STRUCTURES AND SPECIAL OCCUPANCIESCopyright National Fire Protection Association Provided by IHS unde4.19.2 Materials. B Reinforced Concrete Structures Where the Reinforce-780–22 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under licenseTable 4.18.4 Maximum Allowed Suppressed Voltage Ratings per Mode of Protection ProvidedBe780–21PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection Association Provided by IHS under li4.15.4.2 Where rod or cable conductors are used for ground- included within this standard are limited to permanently in-780–20 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Prote4.13.4.2 The ground ring electrode shall be a main-size light- 4.14.1.1 This interconnection shall include lightning protec-780–19PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection A4.12.2 Fittings used for required connections to metal bodies780–18 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANo4.9.8.2 Cross-run conductors shall be connected to the main 4.9.10.6 Lower roofs or projections that are located within a780–17PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection Asso4.9.2 Dead Ends. Strike termination devices shall be permitted780–16 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANA780–15PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permitted without license fro4.8.4.1 Strike termination devices shall be located on the in-780–14 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANor37 mHorizontal protected distance m15 m 50 ft780–13PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reprod780–12 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permitted without l3 Domed roofs780–11PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection Association Provided by IHS under license with NFPANot for ResaleNo reproduction or networking permitted witho4.5 Use of Aluminum. Aluminum systems shall be installed in780–10 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFPANot Table 4.1.1.1A Minimum Class I Material RequirementsSImmmmmmg/mmm2mmmmmmmm2mm780–9PROTECTION FOR ORDINARY STRUCTURESCopyright National Fire Protection Association Provided by IHS under license with 3.3.21.2* Class II Materials. Lightning conductors, air ter- 3.3.33 Vapor Opening. An opening through a tank shell or780–8 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protectio3.2.3 Labeled. Equipment or materials to which has been 3.3.8 Copper-CladSteel. Steel with a coating of copper bonded780–7DEFINITIONSCopyright National Fire Protection Association Provided by IHS undeNFPA 7801.2 Purpose. The purpose of this standard shall be to provide780–6 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license withAnnex K Protection of Structures HousingExplosive Materials ........................... 780–46Annex L Lightning Risk Assessment .................. 780–47Annex M Guide for Personal Safety fromLightningContents5.6 Concrete Tanks and Silos ...................... 780–23780–4 INSTALLATION OF LIGHTNING PROTECTION SYSTEMSCopyright National Fire Protection Association Provided by IHS under license with NFTechnical Committee on Lightning ProtectionGerard M. BerMatthew Caie,Josephine Covino,Ignacio T. Cruz,Robert F. DaleyJoseph P. DeGrNY [RT]Douglas J. Franklin,Inc., MN [M]William Goldbach,Mitchell GuthThe 2004 edition also contained a number of technical revisions throughout the standard. These included the780–2 INSTALLATION OF LIGHTNING PROTECTION SYSTEMS2008Copyright National Fire Protection AssoCopyright © 2007 National Fire Protection Association®. All Rights Reserved.preparedJuneCouncileditions.standardsandbinedInstitute1947the1968,designationPrbytent.clarifystreamermorenotintendedinstallaADDITIONAL NOTICES AND DISCLAIMERSUpdating of NFPA DocumentsUsers of NFPA codes, standards, recommended practices, and guides should be aware thatthese documents may be superseded at any time by the iIMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA DOCUMENTSNOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA DOCUMENTSNFPA codes, standards, recommended practices, and guides, of which theNFPA®780 Standard for the Installation of Lightning Protection Systems 2008 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization Copyright Nationa