MIL-HDBK-1025/10
6.1.4 Abnormal Conditions. Any maintenance done after fault conditions
have interrupted normal service, imposes more than normal maintenance risks. Faulty
energized equipment and lines should always be de-energized before any work is done.
All abnormal operating equipment and electrical components should be de-energized and
tagged.
6.1.5 Defective Equipment. If an apparatus, which is to be worked on, is
found to be in a dangerous condition or not working properly, it should be removed from
service immediately and tagged. Then, a complete report of the condition of the
equipment should be provided by the worker to his/her foreman or supervisor the same
day.
a. Defective equipment removed from service, such as distribution, potential, and
current transformers; capacitors; and surge (lightning) arresters should be positively
identified by the supervisor before they are put in storage. Any existing defective
equipment in storage or at any other location should also be identified.
b. Identify defective equipment by painting a large red X on the body, not on the
top of the equipment. The red X should remain on such equipment until it has been
repaired or until it has been properly disposed of.
c. It should be considered gross neglect of duty and willful disobedience of
instructions for a worker to deface in any way the red X on defective equipment or to
place such equipment in service while so identified. The worker in charge of repairing any
piece of defective equipment should be the only person authorized to remove such
identification and then only after all repairs have been made and the equipment has met all
necessary tests.
d. In cases where defective or reclaimed equipment is repaired and tested by
electrical facility workers, they may then remove the defective identification marking.
Substation Work Area Control. Control of the work area is essential
6.2
for accident prevention. Procedures for specific maintenance may vary but certain rules
are basic to all work.
WARNING
Guidance in the following section is basic to all work, do not
deviate from this guidance unless specific rules are developed that
are at least as protective as those presented above.
6.2.1 Previsit Briefing. A previsit briefing should be carried out to familiarize
workers with the work area. The briefing will include the status of the equipment, what
part if any is energized, location of grounds, what the limits of the working space are,
what open switches disconnect the equipment from any source of supply, and system
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