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Unformatted text preview: LAWRENCE BERKELEY NATIONAL LABORATORY ELECTRICAL SAFETY MANUAL Revision: Rev 1 Date: January 2017 ELECTRICAL SAFETY MANUAL Page 1 of 217 LAWRENCE BERKELEY NATIONAL LABORATORY ELECTRICAL SAFETY MANUAL Revision: Rev 1 Date: January 2017 TABLE OF CONTENTS Revision History ................................................................................................................................ 7 1 1.1 1.2 1.3 1.4 Introduction............................................................................................................................... 8 Purpose ......................................................................................................................................................................................... 8 Scope .............................................................................................................................................................................................. 8 Regulatory Drivers ................................................................................................................................................................... 9 Format ........................................................................................................................................................................................... 9 PART I – ELECTRICAL HAZARDS ........................................................................................................ 10 2 Electrical Hazards ..................................................................................................................... 11 2.1 2.2 2.3 2.4 2.5 2.6 Electrical Hazard Classification ................................................................................................. 23 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Explanation of the electrical hazard classification structure................................................................................ 23 Classification Matrix .............................................................................................................................................................. 25 Hazard Class 1.x, 50-60 Hz Nominal Power ................................................................................................................. 26 Hazard Class 2.x, DC ............................................................................................................................................................... 28 Hazard Class 3.x, Capacitors ............................................................................................................................................... 30 Hazard Class 4.x, Batteries <100 VDC ............................................................................................................................ 34 Hazard Class 5.x, RF Circuits (3 kHz to 100 MHz) ..................................................................................................... 36 Hazard Class 6.x, Sub-RF Circuits (1 Hz to 3 kHz) ..................................................................................................... 38 3 Scope ............................................................................................................................................................................................ 11 Electrical Shock........................................................................................................................................................................ 11 Electrical Burn.......................................................................................................................................................................... 18 Delayed Effects ......................................................................................................................................................................... 21 Battery Hazards ....................................................................................................................................................................... 21 Other Hazards........................................................................................................................................................................... 22 PART II – ELECTRICAL SAFE WORK PRACTICES .................................................................................. 40 4 Electrical Safety Principles & Controls....................................................................................... 41 4.1 4.2 4.3 4.4 4.5 4.6 4.7 General Electrical Safety for All Persons ................................................................................... 49 5.1 5.2 5.3 Scope ............................................................................................................................................................................................ 49 General requirements ........................................................................................................................................................... 49 Recognizing electrical hazards .......................................................................................................................................... 49 5 Principles of Electrical Safety............................................................................................................................................. 41 Application of ISM to Electrical Safety ........................................................................................................................... 42 Planning Electrical Work ..................................................................................................................................................... 43 Hierarchy of controls............................................................................................................................................................. 45 Authorization............................................................................................................................................................................ 46 Executing the Plan .................................................................................................................................................................. 47 Self-Controls for the Qualified Electrical Worker ...................................................................................................... 47 Page 2 of 217 LAWRENCE BERKELEY NATIONAL LABORATORY ELECTRICAL SAFETY MANUAL Revision: Rev 1 Date: January 2017 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 Electrical Safe Work Controls ................................................................................................... 78 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 Scope ............................................................................................................................................................................................ 78 Qualified Electrical Workers (QEWs) ............................................................................................................................. 78 Electrical Work and Requirement for a QEW.............................................................................................................. 79 Mode 0 – Electrically Safe Work Condition .................................................................................................................. 83 Mode 1 – Process for Establishing an Electrically Safe Work Condition (LOTO) ......................................... 84 Mode 2 – Energized Diagnostics (Testing & Troubleshooting) ........................................................................... 86 Mode 3 – Energized Repair Work (EEWP) ................................................................................................................... 89 Electrical Safe Work Procedure (ESWP) ....................................................................................................................... 90 Person in Charge (PIC).......................................................................................................................................................... 93 QEW Skill of the Craft ............................................................................................................................................................ 93 Direct Field Supervision ....................................................................................................................................................... 94 Job Briefing ................................................................................................................................................................................ 95 Working Alone or Accompanied ....................................................................................................................................... 95 6 7 Portable electric equipment ............................................................................................................................................... 55 Extension cords for temporary use ................................................................................................................................. 57 Relocatable Power Taps (Power Strips)........................................................................................................................ 61 Adapter Cord Sets ................................................................................................................................................................... 64 Ground Fault Circuit Interrupters.................................................................................................................................... 64 Heating Tapes and Cords ..................................................................................................................................................... 69 Portable Heating Devices..................................................................................................................................................... 70 Holiday Lights........................................................................................................................................................................... 70 Working Space Around Electrical Equipment............................................................................................................. 70 Switching .................................................................................................................................................................................... 74 Shock Protection .................................................................................................................... 100 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 Arc Flash Protection ............................................................................................................... 112 8.1 8.2 8.3 8.4 8.5 Arc Flash Hazard Analysis ................................................................................................................................................ 112 Determination of an Arc Flash Hazard ........................................................................................................................ 113 Incident Energy Analysis .................................................................................................................................................. 115 Arc Flash Boundary ............................................................................................................................................................. 115 Working Distance................................................................................................................................................................. 118 8 Performing a Shock Hazard Analysis ........................................................................................................................... 100 Determination of a Shock Hazard ................................................................................................................................. 100 Shock Protection Boundaries.......................................................................................................................................... 102 When Voltage Rated Gloves Are Required ................................................................................................................ 108 When Leather Protector Gloves Are Required ........................................................................................................ 108 When Voltage Rated Blankets or Sheeting Are Required.................................................................................... 109 When Insulated Sticks (Hot Sticks) Are Required .................................................................................................. 109 Selection of Shock Protection PPE ................................................................................................................................ 109 Primary vs. Secondary Shock Protection ................................................................................................................... 110 Page 3 of 217 LAWRENCE BERKELEY NATIONAL LABORATORY ELECTRICAL SAFETY MANUAL 8.6 8.7 8.8 8.9 8.10 8.11 8.12 8.13 8.14 9 Revision: Rev 1 Date: January 2017 Incident Energy Analysis for Facility Power Systems........................................................................................... 118 Incident Energy Analysis for R&D Systems............................................................................................................... 119 Energy Reducing Maintenance Switches ................................................................................................................... 119 Arc Flash Labeling ............................................................................................................................................................... 120 Arc Flash PPE Selection ..................................................................................................................................................... 121 Arc flash incident energy >40 cal/cm2 ........................................................................................................................ 123 MCC Buckets, Busway Plug-In Units and Drawout Type Circuit Breakers .................................................. 124 Daily Arc-Rated Work Wear for Electrical Work .................................................................................................... 124 Body Positioning for Arc Flash ....................................................................................................................................... 125 Zero Voltage Verification (ZVV) .............................................................................................. 126 9.1 9.2 9.3 9.4 9.5 9.6 9.7 Purpose .................................................................................................................................................................................... 126 Live-Dead-Live Test Method ........................................................................................................................................... 127 Steps to perform ZVV ......................................................................................................................................................... 127 Where to perform ZVV....................................................................................................................................................... 128 When to perform ZVV ........................................................................................................................................................ 129 Types of Voltage Detectors .............................................................................................................................................. 130 ZVV where there is no exposed conductor ................................................................................................................ 131 10.1 10.2 10.3 10.4 Minimum PPE for Electrical Work ................................................................................................................................ 133 Body Positioning .................................................................................................................................................................. 133 Controlling the Work Area (Alerting Techniques) ................................................................................................. 136 Other Precautions for Personnel Activities ............................................................................................................... 139 11.1 11.2 11.3 11.4 11.5 11.6 11.7 Scope ......................................................................................................................................................................................... 145 Qualification requirements .............................................................................................................................................. 145 Restricted Access to High Voltage Enclosures ......................................................................................................... 145 Switching ................................................................................................................................................................................. 146 Zero Voltage Verification .................................................................................................................................................. 146 Personal Protective Equipment ..................................................................................................................................... 147 Temporary Personal Protective Grounding of High Voltage Circuits ............................................................ 147 12.1 12.2 12.3 Hazards .................................................................................................................................................................................... 151 Design Considerations ....................................................................................................................................................... 151 Safety Practices ..................................................................................................................................................................... 151 13.1 13.2 13.3 Permanently connected standby generators ........................................................................................................... 153 Portable generator connection and operation......................................................................................................... 153 Uninterruptible Power Systems (UPS) ....................................................................................................................... 154 10 General Electrical Safe Work Practices .................................................................................... 133 11 High Voltage Facilities Distribution Systems (>750 VAC).......................................................... 145 12 High Voltage/Low Current DC Systems (>1000 VDC, <40 mA) .................................................. 151 13 Distributed Generation .......................................................................................................... 153 Page 4 of 217 LAWRENCE BERKELEY NATIONAL LABORATORY ELECTRICAL SAFETY MANUAL Revision: Rev 1 Date: January 2017 14 Batteries .........................................................................
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