MIL-HDBK-1025/10
operating aspects. If for any reason there is an interruption in the work, or conditions
change, another conference briefing will be conducted to familiarize all of the workers
with the new conditions.
6.2.2 Clearance Access. When entering an attended station, workers not
regularly employed in the station should report immediately to the operator in charge,
stating their names, offices, purpose of the visit, and their planned activities. For
unattended stations, workers should be escorted by installation personnel. Unattended
substations should always be kept closed and locked. The station key should be kept by
an authorized person.
6.2.3 De-energizing Work Areas. When it is necessary to work on or near any
electrical circuits or apparatus, the procedures in Section 5, as well as pertinent rules given
in this section, should be carefully followed.
6.2.3.1 Switching. Station operators should notify maintenance workers before
doing any switching that affects their work.
6.2.3.2 Lockout/Tagout/Tryout. Lockout/tagout/tryout and tagout all power
sources and circuits to and from the equipment and circuits in the work area. All controls
will be made nonoperative and all feedback circuits, such as from potential transformers or
other sources, will be cleared.
6.2.3.3 Barriers and Barricade Tape. Approved temporary barriers will be
placed between the space occupied by workers and the nearest energized equipment, both
as a protection and as a reminder of the limits of the safe working space. The individual in
charge of lockout/tagout/tryout is responsible for barricade locations and barricades are to
be moved only under that person's direction. After the work is finished, that person will
remove the barriers prior to releasing the completed work.
a. It is recommended that barricade tape be used to enclose work areas and to
isolate temporary hazard areas. Only active workers may enter taped areas until the
hazard has been corrected. A temporary hazard could be a faulty but energized line.
b. Tape should completely enclose the work area, be visible from all approach
areas, and be at an effective barrier level. The area enclosed should be large enough to
provide worker safety and arranged so any test equipment can be operated outside the
taped area.
c. Temporary barriers and barricade tape will not be used as a substitute for guard
railings, for work platforms, or for protection from holes in the floor. Information tags or
other warning devices will be provided to identify a hazard that is not obvious.
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