UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
11-7.2.4 All equipment inside a manhole operating at high voltage levels, including
insulated conductors, should be deenergized before allowing entry into the manhole.
Refer to Tables 4-1 and 4-2 if the equipment inside the manhole cannot be
deenergized.
11-7.2.5 Consider cable and apparatus energized, and use personal protective
equipment in accordance Tables 4-1 and 4-2 until the following steps have been taken.
Test the item with an approved device and confirm it is deenergized.
Ground the item from all possible sources of power (including transformer
secondary back feed).
Grounds are provided at the work location. Grounds may be omitted or
removed for test purposes with the approval of the authorized individual-
in-charge after the circuit has been tested and proven to be deenergized.
Omission of grounds must be permitted only if their application would
increase the work hazard.
The cable has been grounded for a sufficient length of time to drain off any
static charges.
11-7.2.6 Verify low-voltage cables are deenergized as follows. Remove the insulation
to expose a spot on the conductor for direct metallic contact, and test with an approved
voltage detector for cables (positively identified) which are normally energized at 600 V
or less, phase to phase.
11-7.2.7 Verify high-voltage cables are deenergized as follows.
11-7.2.7.1 Use an approved test device to confirm high-voltage equipment and cables
are deenergized when the cable terminals or apparatus are equipped with capacitive
test points or have bare exposed parts.
11-7.2.7.2 If an approved test device cannot be used, confirm the equipment and cables
are deenergized as follows.
Isolate the equipment or cable from all possible sources of power, and
trace it to the work location.
Ground the equipment or cable at the work location. Use remote hydraulic
grounding spike to ground and drain a cable after it has been deenergized
and before contact is made by hand. The worker must be outside the
manhole to operate the remote hydraulic grounding spike.
11-7.3
Working on Cables and Apparatus. Perform the following when working on
cables and apparatus.
11-10
Previous Page
