MIL-HDBK-1025/10
...................................................................................................... PAGE
5.1.1
Safe Working Distances ........................................................................ 23
5.1.2
Work Methods in Relation To Worker's Safety ..................................... 25
5.1.2.1
De-energized Electrical Line Work........................................................ 25
5.1.2.2
Energized Electrical Line Work............................................................. 25
5.1.2.3
Number of Qualified Workers Per Hazard Exposure.............................. 26
5.1.3
Verifying Electrical Systems and Equipment Provisions ......................... 27
5.1.4
Safety Hazard Detection Devices .......................................................... 27
5.1.4.1
Potential Differences ............................................................................. 28
5.1.4.2
Phasing Testers ..................................................................................... 28
5.1.4.3
Combustible Gas/Oxygen Detectors ...................................................... 28
5.1.4.4
Aerial-Lift Bucket Truck Leakage-Current Monitoring.......................... 28
5.2
De-energized Line Work Prescheduling................................................. 28
5.2.1
Preparation Responsibility ..................................................................... 29
5.2.2
Safety Basics......................................................................................... 29
5.2.2.1
Hazardous Energy Elimination .............................................................. 29
5.2.2.2
Lockout/Tagout/Tryout Instructions ..................................................... 30
5.2.2.3
Lock and Tag Color Coding.................................................................. 31
5.3
Grounding Provisions............................................................................ 31
5.3.1
Why Temporary Grounds are Necessary................................................ 32
5.3.2
Equipotential (Single Point) Grounding ................................................. 32
5.3.3
Placement of Grounds ........................................................................... 33
5.3.3.1
Approach Distances .............................................................................. 33
5.3.3.2
Potential Differences ............................................................................. 33
5.3.4
Temporary Grounding System Components .......................................... 34
5.3.4.1
Grounding Clamps ................................................................................ 34
5.3.4.2
Grounding Cable ................................................................................... 34
5.3.4.3
Grounding Ferrules ............................................................................... 35
5.3.4.4
Grounding Cluster Bars......................................................................... 35
5.3.5
Temporary Grounding of Aerial Lines ................................................... 36
5.3.6
Temporary Grounding of Substation Current-Carrying Equipment
Components ........................................................................................ 36
5.3.7
Aerial Lift Truck Vehicle Grounding ..................................................... 39
5.3.8
Temporary Grounding of Underground Lines ........................................ 40
5.3.9
Opening or Splicing De-energized Conductors ...................................... 40
5.3.10
Grounding for Stringing and Removing Lines ........................................ 41
5.4
Energized Electrical Line Work ............................................................. 43
5.4.1
Permitted Electrical Line Work Methods ............................................... 43
5.4.2
Voltage Levels and Approved Work Methods and Equipment ............... 43
5.4.2.1
Rubber Goods ....................................................................................... 44
5.4.2.2
Insulating Tools .................................................................................... 44
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