MIL-HDBK-1025/10
8.6.3 De-energizing Underground Cables and Equipment. Working on cable and
equipment should normally be done after de-energizing the cable or apparatus to be worked on,
whenever possible, and consistent with facility mission requirements.
8.6.3.1 Isolation of Underground Lines
WARNING
Provide complete isolation of cable and protection against premature
energizing by grounding the cable. An absolute check to ensure that no
potential exists should be made prior to cutting into any cable. Remove
the cable (lead or other) sheathing and test for voltage. Use only
approved voltage detectors.
8.6.3.2 Underground Cable and Equipment Grounding. Grounding can be done by
the cable spike method which uses a wire tong or C-clamp device attached to a hot stick to
provide a proven ground. Do not use a pike pole as a spike for this grounding method as the pike
does not have the rating of a hot stick. Care should be exercised to ensure the cable has been
grounded for a sufficient length of time to drain off any static charges.
WARNING
The item will be grounded from all possible sources of power (including
transformer secondary backfeed) and positively traced from the grounded
point to the work location.
Requirements for Working on Underground Cables and Apparatus
8.6.4
WARNING
All workers should maintain the work distance given in Table 11 as
appropriate to the voltage level and whether the item being worked on is
energized or de-energized. Be aware of what items are de-energized and
what items are energized.
8.6.4.1 Underground De-energized Work. All cable and apparatus should be tagged
properly.
8.6.4.2 Protection Against Energized Parts. When a worker is in proximity to live
parts, rubber blankets or other suitable insulating barriers should be placed in the correct position
to prevent accidental contact.
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