MIL-HDBK-1025/10
...................................................................................................... PAGE
5.4.2.3 Insulating Guards .................................................................................. 45
5.4.3
Prework Procedures .............................................................................. 46
5.4.4
General Job-in-Progress Procedures ...................................................... 47
6.1
System Familiarity................................................................................. 49
6.1.1
Diagrams and Schematics ...................................................................... 49
6.1.2
Engineering Guidance ........................................................................... 49
6.1.3
System Operation.................................................................................. 49
6.1.3.1
Protective Devices ................................................................................ 49
6.1.3.2
Alarms .................................................................................................. 49
6.1.3.3
Interlocking........................................................................................... 49
6.1.4
Abnormal Conditions ............................................................................ 50
6.1.5
Defective Equipment ............................................................................. 50
6.2
Substation Work Area Control .............................................................. 50
6.2.1
Previsit Briefing .................................................................................... 50
6.2.2
Clearance Access .................................................................................. 51
6.2.3
De-energizing Work Areas .................................................................... 51
6.2.3.1
Switching .............................................................................................. 51
6.2.3.2
Lockout/Tagout/Tryout ........................................................................ 51
6.2.3.3
Barriers and Barricade Tape .................................................................. 51
6.2.3.4
De-energizing Proof Testing.................................................................. 52
6.2.3.5
Work Area Grounding .......................................................................... 52
6.2.3.6
Adjacent Energized Equipment Protection............................................. 52
6.2.3.7
Worker Protection ................................................................................ 52
6.2.4
Working Area Housekeeping Checks .................................................... 52
6.2.5
Installation Precautions ......................................................................... 53
6.3
Checklist for Safety ............................................................................... 53
6.3.1
Communication Channel Availability ..................................................... 53
6.3.2
Lighting Level....................................................................................... 53
6.3.3
Working Period..................................................................................... 53
6.3.4
Personnel Requirements ........................................................................ 53
6.3.5
Equipment Preparation.......................................................................... 53
6.4
Testing Safety ....................................................................................... 53
6.5
Switching Safety ................................................................................... 54
6.5.1
Air Switches ......................................................................................... 54
6.5.1.1
Disconnect Switches ............................................................................. 54
6.5.1.2
Airbreak Switches ................................................................................. 55
6.5.1.3
Interrupter Switches .............................................................................. 55
6.5.1.4
Inching.................................................................................................. 56
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