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. 2021 Jul 1;16(7):e0253827. doi: 10.1371/journal.pone.0253827

Table 5. Hierarchical task analysis for the de energization power line.

Subtask ID Task description
DE1 Request to de-energize
T1 Area authority make work order
T2 Apply for permit to work
T3 Identify and determine location of de-energization
DE2 De-energization
T4 Wear appropriate PPE
T5 Feeder disconnection
T6 Lock and tag
T7 Communicate the disconnection to operation unit
DE3 Perform voltage test
T8 Wear appropriate PPE
T9 Ensure that instrument is operable
T10 Check in no voltage condition
T11 Retest that instrument is operable
T12 Informed the operation unit of testing results
DE4 Discharge the de-energized line
T13 Install the grounding rod in opposite side of shooting
T14 Open the spool of fuse wire from shooting site toward grounding rod
T15 Fasten one end of the fuse wire to grounding rod and the other end to spare arrow.
T16 Insert the spare arrow in gun tester
T17 Ensure that the opened fuse wire is not put behind the shooter or other crew members
T18 Shooting and interpretation of outcomes
T19 Informed the discharging to operation unit
DE5 Install temporary grounds
T20 Sitting the location of inserting ground electrode
T21 Visually inspect any defect in safety ground wire which is to be applied.
T22 Ensure that all not necessary maintainers have been cleared from the working zone
T23 Fasten the ground end of the safety temporary ground electrode first
T24 Contact and tighten the grounding clamp from the closest to the farthest phase one at a time with the phase end of the safety temporary ground.
T25 Install temporary ground, also at the other end of de energized section
T26 Informed the installation temporary grounds to operation unit