UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
11-7.3.1 Maintain the required minimum working distance in accordance with Table
3-1..
11-7.3.2 All cable and apparatus must be tagged properly.
11-7.3.3 Place rubber blankets or other suitable insulating barriers to prevent
accidental contact when a worker is in proximity to live parts.
11-7.3.4 Consider the following special hazards.
11-7.3.4.1 Check the primary and secondary voltage of any transformer fed from a
deenergized feeder cable. Ground the cable on each side of the work location.
11-7.3.4.2 Do not open neutral conductors without the prior installation of suitable
bypass conductors.
11-7.3.4.3 No energized cable will be moved.
11-7.3.4.4 Deenergize the circuit before separating or connecting a 600 amp dead-
break type separable connector. Verify the circuit is dead by using the associated
capacitive test point and an approved test device. Utilize suitable live-line tools in
separating or connecting these separable connectors, unless the circuit has been
verified as deenergized and is grounded.
11-7.3.4.5 Before operating a primary grounding switch, the authorized operator must
be certain of the following.
All personnel are at their correct location.
The tags on the feeder cable and equipment in the vault or manhole bear
the same numbers as shown on single line drawings.
Network protectors are in the open position or, in the case of radial
transformers, the secondary fuses have been removed and transformer
secondaries are deenergized.
11-7.3.5 All cable to be cut or repaired should be positively identified and deenergized
before each cut. Before making an opening in or removing a part of the sheath or
sleeve of a cable, the line will be grounded at the first possible grounding point on each
side of the work location.
11-7.3.5.1 Perform all high voltage cable cutting remotely from topside using a guillotine
cutter and permit no workers to remain in the space during the cutting.
This will isolate workers by a safe distance in the event of an accidental arc-blast when
the cut is made.
11-11
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