What To Expect In The 2007 NFPA 780
What to expect in the 2007NFPA 780Standard for the Installation of LightningProtection SystemsJohn M. Tobias, Ph.D., P.E.Presentation to LPI Meeting, March 2007
Presentation to LPI Meeting, March 2007
ObjectiveFamiliarize with major revisions for 2007NFPA 780.The topics presented are the final actionsfor the new standard, due out after theJune NFPA meeting.Look on www.nfpa.org for the ROC text.Presentation to LPI Meeting, March 2007
Status Completed ‘Report on Comments’ (ROC)phase. Committee Balloted on Proposals 43 Comments– 9 Rejected.– 1 on ‘hold.’ (Risk Assessment.)– Remainder accepted in some fashion. Next step is NFPA Annual MeetingPresentation to LPI Meeting, March 2007
Editorial ChangesMany revisions editorial in nature, for example: No more ground ‘terminals,’ now electrodes. Conversions to metric (w/ SAE units.) ‘Persons’ vice ‘Personnel.’ Communications as a generality. Preserved unique (and added) definitions.Presentation to LPI Meeting, March 2007
Use of AluminumSeveral revised articles: Clarified intent to separate copper/aluminumLP and structural materials. (4.2.3, 4.2.4, 4.5.1) Clarified intent not to use close to earth.(4.5.2) Permits use in structure interior belowgrade.Presentation to LPI Meeting, March 2007
Strike Terminations Clarified permitting combination striketerminations (4.6.1.5). Permits combination of methods to determinestrike termination placement. (4.7) Clarification of Zone of Protection (4.7.2.2 &4.7.3.1) Protection of Roof Top Units (HVAC, etc.)(4.8.8.5)Presentation to LPI Meeting, March 2007
Strike TerminationsProposal to decrease termination to edgeinterval revisited. (Accepted in Principle.)Presentation to LPI Meeting, March 2007
Strike TerminationsCommittee Meeting Action: Accept in PrincipleChange 4.8.2 to read as follows:4.8.2* Location of Devices. As shown in Figure 4.8.2, thedistance between strike termination devices and ridge ends onpitched roofs or edges and outside corners of flat or gentlysloping roofs shall not exceed 0.6 m (2 ft).Add annex A.4.8.2 to read as follows:A.4.8.2 Strike termination devices should be placed as closeas practicable to roof edges and outside corners.Presentation to LPI Meeting, March 2007
Handrails as Conductors4.9.3.2 Permanent exterior metal handrailsand ladders that are subject to direct lightningstrikes (e.g., on roofs or between roofs) andare electrically continuous shall be permittedto be used as main conductors where theminimum thickness is 1.63 mm (0.064 in).Presentation to LPI Meeting, March 2007
Handrails as Conductors Concern over decreased human safety. Rationale is that it is impossible to keepcurrent off of this type of handrail andpermitting it’s use as a conductorsimplifies implementation.Presentation to LPI Meeting, March 2007
BondingGeneral provision to strengthen bondingrequirements. Metallic piping. (4.20.1.1) Ground electrodes of different systems.(4.14.1) Prohibition of piping use as electrode.(4.13.1.3)Intent is to prevent lightning damage observedon metallic piping systems in the past fewyears.Presentation to LPI Meeting, March 2007
Grounding No more terminals! Electrodes instead! Clarifies ground rod depth vs. separationeffects. (4.13.2.4) Complete rewrite of 4.13.8.1 (Shallow Topsoil)– Clarifies requirements for electrode depth.– Permits ring, radial or plate electrode andcombinations thereof.Presentation to LPI Meeting, March 2007
Strike Terminations on Roofs“4.8.7.1 Wind Turbines. Zones of Protectionfor Wind Turbines will consider their bladediameter and have no part outside of a zone ofprotection afforded by the blades.See Annex for additional information.”Presentation to LPI Meeting, March 2007
Surge Protection New Definitions/Figure of Merit– Nominal Discharge Current (In)– Voltage Protection Level VPL– Broadens category of SPD (previouslycovered under TVSS). Also clarification of requirements.Changes coordinate with upcoming UL1449 3rd ed. to facilitate selection andinspection.Presentation to LPI Meeting, March 2007
Stacks Clarified definition of heavy-duty stack.(6.1) Permits materials other than leadcoatings. (6.4.1.1) Clarifies air terminal placement. (6.4.2.2) Clarifies electrode requirement (6.10.2)Presentation to LPI Meeting, March 2007
Watercraft Entirely rewritten Chapter 8, Protectionfor Watercraft.Dr. Ewen Thomson, with 15 years ofexperience designing shipboard lightningprotection and damage investigation wascontributor to committee.Presentation to LPI Meeting, March 2007
Annexes Significant addition to Annex A for surgeprotection. Revised Annex B (Principles of LightningProtection) Revisions to Tree Protection, Annex F. New Annex O – Protection for WindTurbines.Presentation to LPI Meeting, March 2007
Annexes Held major revisions to Annex L – RiskAssessment for next cycle. Added new flash density map to providebetter statistical average (and retained oldmap for clarity.)Presentation to LPI Meeting, March 2007
Presentation to LPI Meeting, March 2007
Equipotential BondingProblem: AHJs in several locations notpermitting the bonding of metal piping systemsto LP components.Cause(s): Bonding practices permitted in the2005 NEC (Art. 250.104(B)Wording in other standards that prohibit use ofmetal piping systems for ground electrodes.AHJs not understanding the difference betweengrounding and bonding. (Despite good examplein the 2005 NEC Handbook.)Presentation to LPI Meeting, March 2007
Equipotential BondingStandards affected: NFPA 13 Installation of SprinklerSystems, NFPA 24 Installation of Private ServiceFire Mains etc., NFPA 54 National Fuel Gas CodePresentation to LPI Meeting, March 2007
Equipotential BondingRoot cause?A change to NEC (between 1999 & 2002)put ‘gas piping’ into the section of ‘othermetal piping.’This change permits bonding only throughappliance grounding conductor.Presentation to LPI Meeting, March 2007
Equipotential BondingActions of the 780 Committee: Submitted proposals to NFPA 24(Subsequently rejected.) Filed Notice of Intent: Successfully protestedrejection at NFPA annual meeting. (13 & 24) Submitted comment to NFPA 70. Began dialog with NFPA 54, intend to set upjoint working group.Presentation to LPI Meeting, March 2007
Initiatives for Next Cycle Complete risk assessment proposal. Incorporate new grounding findings. Renew efforts for strike modeling & airterminal placement / tall structures. Examine new surge protection findings. Explosives / Flammables integrated(normative) chapter.Presentation to LPI Meeting, March 2007
Conclusion NFPA 780 undergoing several changes,affecting installation requirements. Addressing emerging industries, likewind turbines. Addressing new findings in lightningrelated research. Beginning planning for next cycle.Presentation to LPI Meeting, March 2007
NFPA 780 is your standard.Participate!Presentation to LPI Meeting, March 2007
National GeographicPhotoPresentation to LPI Meeting, March 2007
Presentation to LPI Meeting, March 2007
Presentation to LPI Meeting, March 2007
Dec 07, 2014 · NFPA 780 Standard for the Installation of Lightning Protection Systems John M. Tobias, Ph.D., P.E. Presentation to LPI Meeting, March 2007. Objective Familiarize with major revisions for 2007 NFPA 780. The topics presented are
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Le genou de Lucy. Odile Jacob. 1999. Coppens Y. Pré-textes. L’homme préhistorique en morceaux. Eds Odile Jacob. 2011. Costentin J., Delaveau P. Café, thé, chocolat, les bons effets sur le cerveau et pour le corps. Editions Odile Jacob. 2010. 3 Crawford M., Marsh D. The driving force : food in human evolution and the future.
