BY ORDER OF THESECRETARY OF THE AIR FORCEAIR FORCE INSTRUCTION 32-106514 JUNE 2017Civil EngineeringGROUNDING SYSTEMSCOMPLIANCE WITH THIS PUBLICATION IS MANDATORYACCESSIBILITY: Publications and forms are available on the e-publishing website atwww.e-Publishing.af.mil for downloading or ordering.RELEASABILITY: There are no releasability restrictions on this publication.OPR: AF/A4CSupersedes: AFI32-1065, 15 January 2015Certified by: AF/A4CF(Mr. Gerald Johnson)Pages: 71This instruction implements Air Force Policy Directive (AFPD) 32-10, Installations andFacilities. It assigns maintenance responsibilities and requirements for electrical groundingsystems on Air Force installations, including systems for equipment grounding, lightningprotection, and static protection. This instruction also implements the maintenance requirementsof DOD 6055.09-M, Volume 2, Ammunition Explosives Safety Standards, Enclosure 4,“Lightning Protection,” April 2012, for potentially hazardous explosives facilities. Thisinstruction applies to all personnel, including Air Force Reserve Command (AFRC) units and theAir National Guard (ANG). This instruction may be supplemented at any level, but all directsupplements must be routed to the office of primary responsibility (OPR) of this instruction forcoordination prior to certification approval. The authorities to waive wing/unit levelrequirements in this publication are identified with a Tier number (“T-0, T-1, T-2, T-3”)following the compliance statement. See AFI 33-360, Publications and Forms Management, fora description of the authorities associated with the Tier numbers. Submit requests for waiversthrough the chain of command to the appropriate Tier waiver approval authority or to thepublication OPR for non-tiered compliance items. Refer recommended changes and questionsabout this publication to the OPR using AF Form 847, Recommendation for Change ofPublication; route AF Forms 847 from the field through the appropriate functional chain ofcommand. Ensure that all records created as a result of processes prescribed in this publicationare maintained IAW Air Force Manual (AFMAN) 33-363, Management of Records, anddisposed of IAW the Air Force Records Disposition Schedule (RDS) in the Air Force RecordsInformation Management System (AFRIMS). The use of the name or mark of any specificmanufacturer, commercial product, commodity, or service in this publication does not imply
2AFI32-1065 14 JUNE 2017endorsement by the Air Force. This AFI is intended for and applies to trained electrical personnelonly.SUMMARY OF CHANGESThis instruction has been substantially revised and must be completely reviewed. Major changesinclude the addition of Tier wavier authority requirements for added paragraphs, incorporatedEngineering Technical Letters, updated office symbols, updated glossary, updated references,revision of National Electrical Code (NEC) references to reflect current requirements, revision ofcurrent National Fire Protection Association (NFPA) references to reflect current and upcomingrequirements for new facilities, and clarifications based on questions received from maintenancepersonnel. Also included are the incorporation of Engineering Technical Letter (ETL) 11-28:Mandatory Review and Update of Record Drawings for Nuclear-Capable Weapons andMunitions Storage and Maintenance Facilities, and Engineering Technical Letter (ETL) 12-9:Personnel Certification Requirements for Inspection of Lightning Protection Systems (LPS) onNuclear Weapons Maintenance, Handling, and Storage Facilities.Section A— Maintenance Policy31.Responsibilities. .3Table 1.Scheduled Maintenance for Grounding Systems. .52.Codes and Specifications. .173.Required Maintenance. .174.Recordkeeping and Review for Explosives Facilities.175.Forms. .196.Personnel Qualifications. .197.Developing Procedures. .21Section B— Grounding Resistance and Continuity Tests and Visual Inspections218.Testing Requirements. .219.Visual Inspections of Lightning Protection Systems. .2110.Visual Inspection of Facility Grounds. .22Section C— Grounding and Lightning Protection Requirements2211.Introduction.2212.Testing and Inspecting Static and Lightning Protection Systems and Grounding. .22Example Sketch of Test Points (Typical). .23Static Protection. .24Figure 1.13.
AFI32-1065 14 JUNE 2017Figure 2.3Grounding Static Bus Bar on Interior Wall. .25Lightning Protection Systems. .26Figure 3.ECM With Center Conductor and Air Terminals. .28Figure 4.ECM Without Center Conductor and Air Terminals. .29Surge Protection. .3014.15.Attachment 1— GLOSSARY OF REFERENCES AND SUPPORTING INFORMATION33Attachment 2— BASIC REQUIREMENTS FOR GROUNDING SYSTEMS39Attachment 3— BASIC BONDING REQUIREMENTS46Attachment 4— LIGHTNING PROTECTION SYSTEMS56Attachment 5— MAINTENANCE SELF-CHECK FOR EXPLOSIVES FACILITIES59Attachment 6— TESTING REQUIREMENTS60Section A—Maintenance Policy1. Responsibilities.1.1. The Headquarters, United States Air Force, Deputy Chief of Staff for Logistics,Engineering and Force protection, Directorate of Civil Engineers (HQ AF/A4C) willensure compliance with Statutory Law and will develop, maintain, clarify, approve, andpublish Strategy, Doctrine, Policy, and Air Force Instruction for the Grounding System’sprogram. HQ AF/A4C will also develop Management Internal Control Toolset (MICT) SelfAssessment Communicators as part of the oversight strategy for Grounding Systems.1.2. Air Force Civil Engineer Center (AFCEC) will:1.2.1. Establish standards and criteria for design, maintenance, repair, and managementof grounding and bonding systems in accordance with mandatory requirements of UFC 3520-01, Interior Electrical Systems; UFC 3-550-01, Exterior Electrical PowerDistribution; UFC 3-575-01, Lightning and Static Electricity Protection Systems; andUFC 3-580-01, Telecommunications Building Cabling Systems Planning and Design. (T0).1.2.2. Review emerging and evolving technologies and evaluates for applicability to theAir Force.1.2.3. Evaluate grounding and bonding training conducted internal to the Air Force,conducted by the Defense Ammunition Center (DAC), and conducted by the privatesector. (T-1).1.2.4. Assist direct reporting units (DRU) and Air Force installations with inspectinggrounding and bonding systems and with troubleshooting electrical issues suspected tostem from grounding and bonding issues and discrepancies. (T-2).
4AFI32-1065 14 JUNE 20171.2.5. Assists Air Force Safety Center (AFSEC) and Inspector General (IG) personnelwith determining the equivalency of grounding and bonding protection systems. (T-1).1.3. The Base Civil Engineer (BCE) will:1.3.1. Maintain lightning and grounding systems specifically identified in Table 1according to the procedures within, or procedures referenced by, this instruction. Waviertiers per grounding system provided within table.1.3.2. Ensure that user organizations identified in Table 1 are aware of their maintenanceresponsibilities. (T-2).1.3.3. Train users to perform their responsibilities to inspect and maintain lightning andgrounding systems as identified in Table 1 when requested. On installations where theelectrical utility system is owned by a private entity, consult with the private/systemowner. (T-2).1.3.4. Review the lightning protection system record drawings on each facility at leastannually or after repair actions (including facility repairs and construction additions bycontractors) have been completed.1.3.5. Ensure that, for all functions of the civil engineer squadron that are contracted(e.g., base operations support [BOS] and contractors supporting governmentowned/contractor-maintained facilities/installations), the responsibilities listed within thisinstruction are included in the contract, as applicable.
AFI32-1065 14 JUNE 201751.4. Users. Users will maintain and inspect lightning and electrical grounding systems asidentified in Table 1.Table 1. Scheduled Maintenance for Grounding Systems.Facility orSystemActionRequiredFrequency of erAuthority1. Any and alli nspections shouldfollow NETA MTSguidancea. Visualinspection ofelectricaldistributionequipment1. Exteriorfencing, poleElectrical5 s, andneutrals.b. Physicalcontinuity ofgrounds for2 yearsseparatelyderivedsystemsBCE2. It is not necessaryto perform the 5year inspection ofthe system in asingle year;however, at the endof 5 years,UFC 3-501-01 documentation mustUFC 3-550-01 show that the entiresystem has beeninspected.T-23. If utility isprivatized, this doesnot apply; however,safety andoperationaldiscrepancies anddamage should bereported whenobserved.BCEThis AFIEnsure ring currentsare not establishedby the existence ofgrounds formultiple systemsand equipment.T-2
6AFI32-1065 14 JUNE 2017a. Continuitycheck across2. Electrical gate openingsubstation1 (1 ohm or(if baseless)owned or5 yearstotally/partia b. Groundresistancellymaintained measuremenby the base) t of entrancegate (5 ohmsor less)3. Exteriorlightningarrestorsand/or surgeprotectivedevices on Visualprimarydistributionlines (evenif privatelyowned).a. Facilityserviceentrance visualinspection4. Generalb. Verifybonding ofothersystems tofacilitygroundsT-0BCENETA MTST-0Ensure reliability tothe Air Forcemission.3-5 yearsCriticalsystems 1-3yearsDiscrepanciesshould be reported,in writing, to theowner if other thanAir Force, with ccto BCEBCEUponrevisions to afacilityWhenelectrical orcommunications work is BCEperformed atfacilityserviceUpon newinstallation,installation orupgrade ofother systemsBCErequiringgrounding,and prior tocontractacceptanceNFPA 70(NEC), Art.250NFPA 70(NEC), BT-3Tag or mark in aconspicuous placeto indicate visualinspection date andinitials of inspectorT-3Ensure the integrityof the single pointfacility groundT-0UFC 3-575-01NFPA 70(NEC)
AFI32-1065 14 JUNE 2017c. Visualinspection oflightningprotectionsystem andSurgeprotectivedevices(SPDs)1-2 years, asdeterminedby the baseAHJ, basedon facilitytype.d. Facilitygroundresistancecheck (perNEC Article5 years250, 25ohms or lessat servicegroundingelectrode)a. Resistancemeasurement on staticgrounds(10,000ohms orless)5. POLfacilitiesb. Visualinspectionandmechanicalcheck ofgroundconductorconnections(pull test)7BCENote mechanicaldamage, lightningThis AFIdamage, orNFPA 780discrepanciesUFC 3-575-01 caused by repair,UFC 3-520-01 renovation, oradditionT-3BCEThis AFIT-3UFC 3-460-03T-1Uponinstallationand whenBCEobserved tobe physicallydamagedQuarterly andwhenUserdamagedUFC 3-46003, para.10.3.20AnnuallyBCET-1
8AFI32-1065 14 JUNE 2017Annually forother thanc. Inspection thermal weld.ofIf thermalconnection weld, inspect BCEto grounding uponelectrodeinstallationand whendamaged.d. Facilityserviceentrance visualinspectionWhenelectricalwork isperformed atfacility,includingdestructiveBCEinspectionand any kindof electricaltesting, byother thanBCEUFC 3-46003, para.10.3.20NFPA 70(NEC), Art.250NFPA 70(NEC), BT-1Tag or mark in aconspicuous placeto indicate visualinspection date andinitials of inspectorT-0T-2BCE requirementsare covered in Item4, general facilities.T-2a. VisualinspectionandcontinuityMonthlyvalidation of6. Fuels lab equipmentgroundsUserAFI 91-203,BCE requirementsparas.are covered in Item22.214.171.124.2 and4, general facilities.126.96.36.199.3b. Visualinspection ofMonthlyfacilitygroundsUserAFI 91-203Resistancemeasurement on staticWhengroundsinstalled or(10,000repairedohms orless)BCEUFC 3-575-017. Aircraftparkingaprongrounds andhangar floorstaticgroundsT-1
AFI32-1065 14 JUNE 20178. LOXstorageResistancemeasurement on staticground(10,000ohms orless)9. Rail caroff-loadingspurAnnually (Ifthe rail carenters anVisualexplosiveinspection offacility, testrail bondingfor continuityevery 2years)Groundresistancemeasurement at serviceentrance(Per NECArticle 250,10 ohms orless at theservice10.groundingCommunicat electrode isions (&designTEMPEST) objective. IfFacilities10 ohmscannot beobtainedaftercompliantinstallationof a groundloop,resistance isrecorded asis.)Wheninstalled,physicallydamaged, orrepaired9BCEBCEQuarterly forfirst yearafterinstallation;BCEthen every 21months (seeNote for thisitem)This AFIT-2This AFIT-2NFPA 70(NEC)This AFICommunicationsfacilities requiretiered surgesuppression –protection at themain distributionpanel and any subpanel servingsensitivecommunication sequipment, HVAC,and atcommunication sequipment.Note: User hasrequested 21months in order tocomply with theirreferences. User isresponsible fortrend analysis.T-0
10AFI32-1065 14 JUNE 2017Checks11.involving inCommunicat houseionselectronicEquipment equipmentgrounda. Visualinspection ofstatic busbars,groundingconductors,and bonds12.Hazardous2explosives b.Resistancearea(weapons) to groundforequipmentbondingstraps(10,000ohms orless)Determinedby user fromT.O. andUserequipmentmanufacturerMIL-HDBK419ABefore usingequipmentUserand every 6monthsAFMAN 91201, para.188.8.131.52 and184.108.40.206.3.3.1This AFIAnnually fornuclearBCEfacilitiesWhenphysicallydamaged orwhen frayedfrom usec. Continuity Whenphysicallyacrossdamagedbonds,NFPA 780,Ch. 8To prevent theeffects oftransients/surges onthe electricaldistribution,communicationsequipment contractsshould includeSPDs on the loadsides of sub-panels.If surge protectivedevices are requiredby the equipmentmanufacturer, this isto be purchased andinstalled as part ofthe project.T-3T-3Explosives areagoverned byDDESBT-0UserAFMAN 91201, para.5.13.1T-3UserAFMAN 91201, para.220.127.116.11T-3
AFI32-1065 14 JUNE 201711between busbars,conductors, After systemand bonding modification BCEstraps (lessthan 1 ohm)NFPA 780,Ch. 8d. Facilitygroundresistancecheck (perNEC Article250, 25ohms or lessat servicegroundingelectrode)When repairor renovationBCEis made to thefacilityNFPA tionand whendamage isreportedAFMAN 91201, para5.19.1BCEf. Visualinspection ofSPDsAnnuallyBCET-0T-0 PerNECExplosives areagoverned byDDESBThis AFINFPA 780,Ch. 86 months andafter aUserlightningstrikeExplosives areagoverned byDDESBExplosives areagoverned byDDESBVisual inspectionmay consist only ofchecking for anAFMAN 91- indicator lamp,denoting SPD201, para.18.104.22.168.3.3.1 operationThis AFIExplosives areagoverned byDDESBT-1 forrepair orrenovationT-1T-3T-0g. SeenonhazardouThis block is This block is This block iss explosivesintentionally intentionally intentionallyrequirementsblankblankblank13e, 13f,13g, and 13i13. Nonhazardous2Semia. Visualinspection of annuallyUserAFMAN 91201, para.Intent of“semiannually” isT-3
12explosivesarea(weapons)AFI32-1065 14 JUNE 2017static busbar,conductor,and bondsb.Resistanceto groundforequipmentbondingstraps(10,000ohms orless)5.13.4AnnuallyWhenphysicallydamaged orwhen frayedfrom usec. Continuitycheck fromWhenequipment tophysicallystatic busdamagedbar (1 ohmor less)d. Facilitygroundresistancecheck (PerNEC Article24 months250, 25ohms or lessat facilitygroundingelectrode)BCENFPA 780,Ch. 8UserAFMAN 91201, para.5.13UserAFMAN 91201, para.5.13NFPA 780,Ch. 8Explosives areagoverned byDDESBT-0Explosives areagoverned byDDESBT-3Explosives areagoverned byDDESBT-0Explosives areagoverned byDDESBT-0NECThis AFIBCEAFMAN 91201, para.5.13.1NFPA 780AHJNECe. Visualinspection oflightning12 monthsprotectionsystemcomponentsevery 180 days, 10daysBCEAFMAN 91201, para.22.214.171.124This AFINFPA 780AHJAFMAN 91-201refers to AFI 321065T-0Explosives areagoverned byDDESB
AFI32-1065 14 JUNE 2017f. Groundresistancemeasurement on LPS atgroundingelectrode(per NECArticle 250, 24 months25 ohmsmaximum)measureddiagonallyopposite toelectricalserviceg.Continuityvalidation onairterminals,24 monthsbonds, andconductorconnections(1 ohm orless)13NECBCEThis AFINFPA 780AHJAFMAN 91201BCEh. Visualinspection ofSPDsi. Static busbarcontinuity to 24 monthsground (1ohm or less)This AFINFPA 780AHJ6 months andafter aUserlightningstrikeAnnuallyAFMAN 91201, para.126.96.36.199BCET-0Explosives areagoverned byDDESBExplosives areagoverned byDDESBVisual inspectionmay consist only ofAFMAN 91- checking for an201, para.indicator lamp,188.8.131.52.3.3.1 denoting SPDoperationThis AFINFPA 780AHJAFMAN 91201BCEAFMAN 91-201refers to AFI 321065This AFINFPA 780AHJT-0T-2Explosives areagoverned byDDESBT-0Explosives areagoverned byDDESBT-0
14AFI32-1065 14 JUNE 2017a. Facilitysingle nd every 24monthsThis AFIGoverned byDDESBT-0BCEThis AFIGoverned byDDESBT-0AtconstructionBCEand every 24monthsThis AFIGoverned byDDESBT-0BCEThis AFIGoverned byDDESBT-0AtconstructionBCEand every 24monthsThis AFIGoverned byDDESBT-0This AFIGoverned byDDESBT-0b. Visualinspection of12 monthsgroundingsystemc. Continuitybetweenarch andground (1ohm or less)14.Protectiveaircraftshelter3vaultd. (HAS)Validatedoor hinge 24 monthscontinuity (1ohm or less )e. (HAS)Continuitybetweenvault lip(flange) andground (steelconduit) (1ohm or less)f. Continuityof installed(permanent)Whenbondsnotified ofbetweendamagemetalmasses andsteel supportBCE
AFI32-1065 14 JUNE 201715g. Visualinspection ofpermanentbondsAnnuallybetweenmetalmasses andsteel supportBCEThis AFIa. Groundresistancevalidation(Per NECArticle 250,5 years25 ohms orless atservicegroundingelectrode)BCENFPA 99T-3Beforeacceptance ofnew facilityor afterBCEserviceentrancemodificationNFPA 99T-0Annually(semiannually forcritical careareas)BCENECT-0BCEThis AFIT-2b.Effectivenes15. Medicals offacilities4groundingsystem byvoltage andimpedancemeasurementsc.Verificationof continuityof receptaclegroundingcircuitsGround16. Airfield resistancelightingcheck (Pervault single NEC Article 2 yearspoint facility 250, 25groundohms orless)Governed byDDESBT-0
1617. EMPhardenedfacilities18. PMEL19. Specialintelligence,cyber, SCIF,UAS/RPA,launch andspace, andotherspecial-usefacilities4AFI32-1065 14 JUNE 2017(Thesefacilitiesmay havespecialrequirements) Otherwise,resistance2 yearscheck (PerNEC Article250, 25ohms or lessat servicegroundingelectrode)UserT-3DNA-A-8660, Vol 1-3This AFIBCET-2a. Visualinspection of Before eachequipment usebondsUserThis AFIb.Continuityandresistancetest offacilityground (Per 5 yearsNEC Article250, 10ohms or lessat servicegroundingelectrode)BCEThis AFIa. TBD byAHJThis block isintentionally BCEblankThis block isintentionallyblankb. TBD byAHJThis block isintentionally UserblankThis block isintentionallyblankT-3FC 4-218-01FT-2
AFI32-1065 14 JUNE 201717a. toutage toBCE)Userb. VisualinspectionAfterunscheduledpoweroutages andannuallyBCE20. SurgeprotectivedevicesThis AFINFPA 780User
UFC 3-501-01 UFC 3-550-01 1. Any and all inspections should follow NETA MTS guidance 2. It is not necessary to perform the 5-year inspection of the system in a single year; however, at the end of 5 years, documentation must show that the entire system has been inspected. 3. If utility is privatized, this does not apply; however, safety and