UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
portable ladders is preferred. Ladders in manholes, if provided, may have rusted and
become unsafe.
11-7.1.2 Handle tools in a manner that protects the workers and work area.
11-7.1.2.1 Place tools or materials a safe distance from manhole openings, where they
must not cause a stumbling hazard or come in contact with energized conductors or
equipment.
11-7.1.2.2 Do not throw tools or materials into or out of manholes. Use canvas buckets
or hand lines for lowering tools or equipment into and removing them from manholes.
Warn workers before lowering tools.
11-7.1.2.3 Provide a safety harness attached to a retrieval device with a windless hand
crank for non-entry removal; subsurface worker rescue assembly; or an approved
retracting lifeline system.
11-7.1.3 When the use of open flames is necessary, consider the proximity of
combustible or flammable liquids, such as a nearby gasoline service station or
underground fuel storage tank. If in doubt, retest the atmosphere before lighting the
open flame. Provide adequate ventilation when open flames are used in manholes.
11-7.1.4 Low-voltage (less than 600 V) equipment can be especially hazardous in or
around subsurface structures. Tool frames and cases can become energized by
electrical conductors with frayed or damaged insulation. These faults may occur only
momentarily or could be prolonged through high-resistance grounding paths. Contact
with these energized tool frames and cases in the vicinity of damp, well-grounded floors
and walls can easily result in electrocution. Use only approved (ground fault protected,
battery operated, or pneumatic) lighting systems and tools in maintaining subsurface
structures.
11-7.2
Work Precautions.
11-7.2.1 Properly identify cables before beginning any work. Check cable tags. If tags
have become illegible or lost, obtain specific instructions from the authorized individual-
in-charge before starting work. Complete re-tagging before starting work.
11-7.2.2 The external appearance of high-voltage and low-voltage cables can be
similar. Report any errors found in the cable tags or in the manhole records or maps to
the authorized individual-in-charge. Work must not continue until permission is given by
the authorized individual-in-charge.
11-7.2.3 Do not remove or place an identification tag on a circuit without direct
permission from the authorized individual.
11-9
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