UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
understood so to eliminate the danger of electrical feedback from another source,
possible paralleling of two unsynchronized sources, or other unsafe operations.
9-1.5
Abnormal Conditions. Maintenance accomplished after the occurrence of
fault conditions that interrupted normal service imposes higher than usual maintenance
risks. Faulty energized equipment and lines must always be deenergized before any
work is done. All abnormal operating equipment and electrical components must be
deenergized and tagged.
9-1.6
Defective Equipment. Electrical apparatus found to be in a dangerous
condition or not working properly must be removed from service immediately and
tagged. Subsequently, a complete report on the defective equipment must be provided
by the worker to the authorized individual-in-charge, the same day if feasible.
9-1.6.1 Defective equipment removed from service, such as: distribution, potential,
and current transformers; capacitors; and surge (lightning) arresters must positively be
identified by an authorized individual before they are put in storage. Existing defective
equipment in storage or at any other location must also be clearly identifiable.
9-1.6.2 Identify defective equipment by painting a large red "X" on the body (not on
the top) of the equipment. The red X must remain on such equipment until it has been
repaired or until it has been properly disposed of. Local policy may dictate use of their
preferred defective equipment identification marking.
9-1.6.3 It must be considered a serious neglect of duty, and willful disobedience of
instructions for a worker to deface in any way the identification marking on defective
equipment or to place such equipment in service while so identified. The worker in
charge of repairing any piece of defective equipment must be the only person
authorized to remove the defective markings, and then only after all repairs have been
made and the equipment has passed all required testing.
9-2
SWITCHING. Opening or shutting a power switch can expose the electrical
worker to some degree of hazard. A mishap might occur if a switch is closed when a
fault is still present on the line. To prevent a mishap, the authorized individual must
prepare a switching sequence and identify all load isolation requirements. All switches
operated in the switching sequence must be correctly identified. The electrical worker
will review the manufacturer's operation manual for any switch that is unfamiliar, and all
safety steps listed in the operation manual will be accomplished before opening or
closing the switch.
WARNING
Switches can fail during switching operations, creating arc flash hazards.
Wear arc rated clothing and/or switching suits during these operations in
accordance with Chapter 4 requirements.
9-2
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