UFC 3-560-01
6 December 2006
Including change 1, 7 December 2006
6-1.7.1 A single blade, stick-operated disconnect switch cannot be mechanically
blocked open and ordinarily is not capable of being locked out. In this case, a danger
tag hung on each phase would normally be considered an acceptable provision for
electrical safety. Suitable tag holders, made of insulating material and designed for
installation with a hot stick, must be used on single blade stick-operated disconnect
switches, fused cutouts, open jumpers, and similar visible line breaks.
6-1.7.2 Gang-operated switches are normally designed to be locked open and a
single danger tag must be tied on the locked switch. Tag must be secured with
minimum 50-pound pull-rated tie.
6-1.7.3 A turbine throttle valve can usually be locked in the closed position. A danger
tag must also be provided.
6-1.7.4 On overhead lines, a visible line break must be provided at all points of
possible feed. An opened circuit breaker is not normally acceptable in lieu of a visible
line break on overhead systems, and must be used only when it is not feasible to
remove the line side leads from the circuit breaker bushings and it is not possible to
provide a visible line break near the circuit breaker. If a circuit breaker is used for
electrical isolation, the circuit breaker must be mechanically blocked or locked open,
and a danger tag tied on the circuit breaker. Additionally, the authorized individual-in-
charge must ensure workers are particularly careful in determining that the line is
actually deenergized. Also, temporary grounds must be installed on overhead systems
as close as possible to the worker. Tag must be secured with minimum 50-pound pull-
rated tie.
6-1.7.5 On underground systems, it is often not feasible to provide a visible line
break. For these systems, use of a circuit breaker or subway disconnect switch locked
or blocked mechanically in the open position and provided with a danger tag is
acceptable. The authorized individual-in-charge must ensure workers are particularly
careful in determining that the line is actually deenergized. Also, temporary grounds
must be installed on underground system as close as possible to the worker.
6-1.7.6 Fuse cutouts must be blocked or locked in the open position, the fuse block
removed, and the clamp provided with a Danger tag.
6-1.7.7 A Caution tag must be hung on a normally open switch if it has been closed to
tie two lines together prior to taking a section of one of the lines out of service. The
position of the switch with the Caution tag must not be changed without prior approval of
the authorized individual-in-charge. Additionally, if the position of the switch with the
Caution tag is to remain in the changed position, the Safe Clearance must be updated
with the new position and the date and time the change was effected. Tag must be
secured with minimum 50-pound pull-rated tie.
6-2
ENERGY CONTROL (LOCKOUT/TAGOUT). These rules apply to both low-
and high-voltage levels.
6-5
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