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NOT MEASUREMENTSENSITIVEDOE HANDBOOKELECTRICAL SAFETYU.S. Department of EnergyWashington, D.C.20585DOE-HDBK-1092-2013July 2013SupersedingDOE-HDBK-1092-2004December 2004AREA SAFTDISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

DOE-HDBK-1092-2013Available on the Department of EnergyTechnical Standards ProgramWeb site athttp://www.hss.doe.gov/nuclearsafety/techstds/ii

DOE-HDBK-1092-2013FOREWORD1.This Department of Energy (DOE) Handbook is approved for use by the Office ofHealth, Safety and Security and is available to all DOE components and theircontractors.2.Specific comments (recommendations, additions, deletions, and any pertinent data) toenhance this document should be sent to:Patrick TranHS-12/GermantownU.S. Department of Energy1000 Independence Ave. SWWashington, DC 20585-02703.This DOE Electrical Safety Handbook replaces the DOE Electrical Safety Handbookthat was originally issued in 1998, and revised in 2004. DOE handbooks are part ofthe DOE directives system and are issued to provide supplemental informationregarding the Department's expectations for fulfilling its requirements as contained inrules, orders, notices, and regulatory standards. The handbooks may also provideacceptable methods for implementing those requirements. Handbooks are notsubstitutes for requirements, nor do they replace technical standards that are used todescribe established practices and procedures for implementing requirements.4.This updated handbook contains DOE-developed explanatory material in support ofnational electrical safety codes and standards, including those referenced in the Codeof Federal Regulations (CFR) in 10 CFR 851, Worker Safety and Health Program.Sections of this handbook were revised and relocated within the handbook forimproved clarity of information. This document references the most recent version ofeach code and standard at the time of development, recognizing that newer versionsare invariably improved and provide increased safety over previous versions. 10 CFR851 references the 2005 edition of the National Fire Protection Association (NFPA) 70,the National Electrical Code (NEC), and the 2004 edition of the Standard for ElectricalSafety in the Workplace (NFPA 70E). This document, however, references the 2008NEC and the 2009 NFPA 70E versions. Each site must ensure, through review, thatits implementation of the newer versions meets the intent of 10 CFR 851. In additionother electrical codes and standards utilized in this handbook include: 29 CFR 1910,Subpart S, Occupational Safety and Health Standards, Electrical; 29 CFR 1926Subpart K, Safety and Health Regulations for Construction, Electrical; IEEE/ANSI StdC2, National Electrical Safety Code (2007); NFPA 70B, Recommended Practice forElectrical Equipment Maintenance (2010); and others. For a complete list ofreferences used in this document, see Section 14.iii

DOE-HDBK-1092-2013CONTENTS1.0 INTRODUCTION11.1 PURPOSE . 11.2 SCOPE . 11.3 ELECTRICAL SAFETY PROGRAM . 21.4 AUTHORITY HAVING JURISDICTION . 22.0 GENERAL REQUIREMENTS42.1 ELECTRICAL MAINTENANCE OR REPAIRS . 42.1.1Work on Electrical Equipment . 42.1.2Considerations for Working on Energized Systems and Equipment . 42.1.3Safety Watch Responsibilities and Qualifications . 52.2 BASIC SAFEGUARDS. 52.3 RESPONSIBILITIES . 62.3.1Management Responsibilities . 62.3.2Employee Responsibilities . 72.4 MODIFICATIONS TO FACILITIES . 72.5 APPROVAL OF ELECTRICAL EQUIPMENT . 72.6 CODES, STANDARDS, AND REGULATIONS. 72.7 TRAINING AND QUALIFICATIONS OF QUALIFIED WORKERS . 82.7.1Formal Training and Qualifications . 82.7.2Training of Safety Personnel. 92.8 WORKING SPACE AROUND ELECTRICAL EQUIPMENT . 92.8.1Electrical Equipment Rated at 600 Volts or Less . 92.8.2Electrical Equipment Rated over 600 Volts . 112.9 IDENTIFICATION OF DISCONNECTING MEANS . 122.9.1Disconnecting Means . 122.9.2Panelboard Circuit Directories . 122.9.3Enclosure Labeling. 122.9.4Load Labeling. 122.9.5Source Labeling . 122.10 WORK INSTRUCTIONS . 132.10.1Safe Work Instructions and Supervision . 132.10.2Work Planning . 132.11 ELECTRICAL PERSONAL PROTECTIVE EQUIPMENT. 142.11.1Management's Responsibilities. 142.11.2Inspecting PPE. 142.11.3Cleaning and Electrical Testing of PPE . 142.11.4Live-Line Tools . 152.11.5Fiberglass-Handled Tools . 152.11.6Maximum-Use Alternating Current (AC) Voltage . 152.11.7Maximum Usage Voltage for Live-Line Tools . 152.11.8Rubber-Insulated Gloves . 162.11.9Storage. 162.11.10Safety Shoes, Hardhats, and Glasses . 16iv

DOE-HDBK-1092-20132.12 WORK PRACTICES . 162.12.1Establishing an Electrically-Safe Work Condition . 162.12.2Training . 192.12.3Planning the Work . 192.12.4Personal Protective Equipment. 232.12.5Electrical Injuries . 233.0 Hazard Analysis244.0 ELECTRICAL PREVENTIVE MAINTENANCE254.1 DEVELOPMENT AND IMPLEMENTATION REQUIREMENTS . 254.2 ELECTRICAL PREVENTIVE MAINTENANCE PROGRAM . 254.3 MAINTENANCE . 254.4 INSPECTION . 254.5 ESSENTIAL ELEMENTS . 264.6 PLANNING AND DEVELOPING AN EPM PROGRAM, AND FUNDAMENTALS OF EPM . 264.7 GROUND FAULT PROTECTION AND ARC FAULT CIRCUIT INTERRUPTERS . 264.7.1Ground Fault Circuit Interrupters (GFCIs). 274.7.2Arc Fault Circuit Interrupters (AFCIs). 284.7.3Ground Fault Protection for Equipment (GFPE) . 294.8 OVERCURRENT PROTECTIVE DEVICES . 295.0 GROUNDING305.1 SPECIFICATIONS AND DRAWINGS. 305.2 CIRCUIT AND SYSTEM GROUNDING. 305.3 EQUIPMENT GROUNDING . 305.4 BONDING . 315.5 GROUNDED OR UNGROUNDED SYSTEMS . 325.5.1Grounded Systems . 335.5.2Ungrounded Systems . 345.5.3High-Impedance Grounding . 355.6 GROUNDING REQUIREMENTS . 365.7 GROUNDING ELECTRODE CONDUCTOR (GEC) . 375.7.1Sizing the Grounding Electrode Conductor . 385.7.2Exceptions to NEC 250.66 . 385.8 MAIN BONDING JUMPER. 385.9 SYSTEM WITH GROUNDED CONDUCTOR. 395.10 EQUIPMENT GROUNDING CONDUCTOR . 405.10.1Sizing the Equipment Grounding Conductor . 415.10.2Separate Equipment Grounding Conductors . 415.11 UNGROUNDED SYSTEMS . 415.12 GROUNDING A SEPARATELY DERIVED SYSTEM . 425.13 GROUNDING ELECTRODE SYSTEM . 425.14 PERSONNEL PROTECTIVE GROUNDS . 435.14.1Purpose of Personnel Protective Grounds . 445.14.2Criteria for Personnel Protective Grounds . 445.14.3Grounding Clamps . 45v

DOE-HDBK-1092-20135.14.4Screw-Tightening Devices . 455.14.5Grounding Cable Length . 455.14.6Grounding Cable Connection. 455.14.7Connecting Grounding Cables in Sequence. 455.14.8Removing Protective Grounds . 455.14.9Protective Apparel and Equipment . 456.0 SPECIAL OCCUPANCIES476.1 EXPLOSIVES. 476.1.1Evacuation . 476.1.2Shutdown of Operations . 476.1.3Lightning Protection . 476.1.4Static Electricity. 486.1.5Electrical Equipment and Wiring . 516.1.6Testing . 536.2 PREVENTION OF EXTERNAL IGNITION AND EXPLOSION . 576.2.1Sources of Ignition . 586.2.2Combustion Principles . 586.2.3Evaluation of Hazardous Areas . 596.2.4Intrinsically Safe Equipment. 596.2.5Enclosures . 596.2.6Purging/Pressurization Systems . 616.3 HAZARDOUS LOCATIONS. 626.3.1Class I . 626.3.2Class II . 666.3.3Groups . 686.3.4Ignition Temperature . 686.3.5Flammable (Explosion) Limits . 686.3.6Flashpoint. 696.4 ELECTRICAL EQUIPMENT FOR CLASS I, II, AND III AREAS . 696.4.1Seals and Drains . 696.5 DESCRIPTIONS, FEATURES, AND TEST CRITERIA OF ENCLOSURES FOR HAZARDOUS(CLASSIFIED) LOCATIONS (PER NEMA 250). 716.5.1Type 7 Enclosures . 726.5.2Type 8 Enclosures . 726.5.3Type 9 Enclosures . 736.6 UNDERGROUND FACILITIES . 746.6.1Work on Electrical Equipment and Circuits . 756.6.2Power Cables and Conductors . 756.6.3Trailing Cables . 766.6.4Trolley Circuits for Track Haulage. 767.0 REQUIREMENTS FOR SPECIFIC EQUIPMENT777.1 CONVEYING SYSTEMS . 777.1.1Electrical Design Criteria . 777.2 CRANES AND HOISTS . 787.2.1NEC General Requirements . 78vi

DOE-HDBK-1092-20137.2.2Disconnecting Means . 787.2.3Grounding . 807.2.4Control. 807.2.5Clearances . 807.2.6OSHA and NEC Requirements . 807.2.7Maintenance and Operations . 807.2.8Documented Maintenance . 817.2.9Mechanical Elevating and Rotating Equipment . 817.3 ELEVATORS AND ESCALATORS. 827.3.1Codes and Standards . 827.3.2Design Specifications . 827.3.3Emergency Power . 847.3.4Design . 847.3.5Fire Protection . 857.3.6Inspections and Records . 857.4 PORTABLE AND VEHICLE-MOUNTED GENERATORS . 857.4.1Ground Fault Circuit Interrupter . 867.4.2Grounding Portable and Vehicle-Mounted Generators. 867.5 BATTERIES . 867.5.1Surrounding Space . 867.5.2Location. 867.5.3Ventilation . 877.5.4Conduit . 877.5.5Battery Room . 877.5.6Personal Protective Equipment. 887.5.7Tools . 887.5.8Storage Batteries and Battery Banks . 888.0 WORK IN EXCESS OF 600 VOLTS918.1 RESPONSIBILITIES FOR SAFETY . 918.1.1Workers . 918.1.2Supervisors . 928.2 TRAINING . 928.2.1Employee Training . 928.2.2Qualified Employee Training . 938.3 JOB BRIEFINGS. 938.4 PERSONAL PROTECTIVE EQUIPMENT AND PROTECTIVE CLOTHING . 948.4.1Shoes . 948.4.2Hardhats . 948.4.3Eye Protectors. 958.4.4Conductive Articles . 958.4.5Work Gloves. 958.4.6Work Clothes. 958.4.7Fire-Resistant (FR) Arc-Rated (AR) Clothing . 958.4.8Rubber Gloves . 96vii

DOE-HDBK-1092-20138.4.9Rubber Line Hose, Hoods, Covers, Sleeves, and Blankets . 978.4.10Live Line Tools . 978.4.11Storeroom Storage . 978.4.12Truck Storage. 978.4.13Placing of Insulating Goods on Conductors . 988.4.14Removing Insulating Goods from Conductors . 988.4.15Cleaning and Inspecting . 988.5 PROTECTIVE GROUNDING OF LINES AND EQUIPMENT . 988.5.1Purpose . 988.5.2Application. 998.5.3Grounding Equipment . 1018.5.4Testing Before Installing Grounds. 1048.5.5Attaching and Removing Grounds . 1048.5.6Grounding Methods and Location of Grounds in Order of Preference . 1058.5.7Testing Without Grounds . 1058.5.8Ground Personnel . 1058.6 INSTALLING OR REMOVING CONDUCTORS . 1068.6.1Working on Energized Line or Equipment . 1068.6.2Stringing or Removing De-energized Conductors . 1068.6.3Stringing Adjacent to Energized Lines . 1088.7 SPECIAL TOOLS . 1088.7.1Lineworkers’ Climbing Tools . 1098.7.2Body Belts and Safety Straps . 1108.7.3Tool Bag and Equipment . 1108.7.4Tapes and Rulers . 1108.7.5Spoon and Shovels . 1108.7.6Pike Poles . 1108.7.7Hand Axes and Sharp Tools . 1108.7.8Handlines and Taglines . 1108.8 TREE TRIMMING . 1118.8.1Care and Use of Tools . 1118.8.2Climbing . 1118.9 UNDERGROUND . 1118.9.1Working in Manholes, Utility Tunnels, and Vaults. 1118.9.2Working on Energized Underground Cables . 1138.9.3Terminals of Underground Cables (Potheads) . 1138.10 FERRO-RESONANCE. 1139.0 TEMPORARY WIRING1159.1 REQUIREMENTS AND INSTALLATION CONDITIONS OF USE. 1159.1.1Contact Prevention. 1159.1.2Vertical Clearances .

DOE HANDBOOK . ELECTRICAL SAFETY . DOE-HDBK-1092-2013 July 2013 Superseding DOE-HDBK-1092-2004 . the National Electrical Code (NEC), and the 2004 edition of the . This document, however, references the 2008 NEC and the 2009 NFPA 70E versions. Each site must ensure, through review, that its implementation of the newer versions meets the .