ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
Issued To. Fill In the name of the person receiving the Safe Clearance and time of issuance. Safe Clearances
must be issued only to technicians authorized to receive them by the supervisor, who will maintain a list of all
such technicians. Generally, only one Safe Clearance may be issued and if more than one crew is assigned to
the work, the holder of the Safe Clearance must be responsible for all the crews. When it is necessary, because
of the distance separating the various crews or the extent of the work, as many Safe Clearances as required may
be issued. In such a case, the supervisor, or other designated technician, will issue and receive releases of all
the Safe Clearances. The technician receiving a Safe Clearance is responsible for checking all blocking and
tagging and being assured that all points of possible feed are open on all phases and properly blocked and
Issued By. Fill in the name of the person issuing the Safe Clearance and time and date of issuance. The
supervisor must either issue Safe Clearances, authorize another technician to issue them, or authorize the
person receiving the Safe Clearance for self-issuance. In the latter case, the technician receiving the Safe
Clearance will fill in both the "issued to" and "issued by" blocks.
Released By. The person accepting release of the Safe Clearance must fill In the name of the person releasing
the Safe Clearance, if it is someone else (see instructions for "issued by"). The person releasing a Safe
Clearance is responsible for making sure that all personnel and temporary grounds are clear and that the line or
equipment is ready for service.
Accepted By. The name of the person accepting release of the Safe Clearance must be filled in as well as time
and date of release (see instructions for "issued by") If issued more than one Safe Clearance, the person is
responsible for seeing that all Safe Clearances are released before any change is made in the blocking or
tagging which would affect Safe Clearances which have not been released.
Time Removed. If blocking and tagging have been applied for more than one Safe Clearance, perform no
switching until the Safe Clearances with numbers corresponding to the numbers on all red tags on the switch,
valve, visible line break, or other device of blocking have been released When releases have been received for
all Safe Clearances, perform switching in reverse order than that in which it was applied. Beginning with the last
detail of switching, blocking, and tagging applied, perform the opposite operation, progressing upward on the
form and enter the time each operation is performed. For instance, if a detail of switching, blocking, and tagging
reads "Switch A open and red tagged", the opposite operation is "Red tags removed and switch A closed"
Do not operate the equipment after removing a red tag if it is still tagged with another red tag. Death or Injury to
personnel could result.
1-14. DEENERGIZED LINES AND EQUIPMENT.
a Low Voltage (Below 600 Volts) Lines and equipment must be positively proven to be deenergized before work is
begun. An approved voltage detector must be used for this test The detector must be checked on a conductor
known to be energized both before and after the test on the supposedly deenergized lines or equipment. A voltmeter
known to be in good condition may be used in lieu of the voltage detector if an energized conductor IS not available.
All energized conductors or equipment within reach of technicians must be covered with insulating material or
approved rubber protective equipment. Lines and equipment to be worked on should be grounded unless it is
considered undesirable by the supervisor. When putting in new conductors adjacent to or near energized conduc-
tors, the new conductors must be effectively grounded, and treated as if energized.
b Intermediate Voltage (600 to 5.000 Volts). (1) Lines and equipment, even though covered by a Safe Clearance,
must be considered energized until positively proven to be deenergized. An approved voltage detector must be
used for this purpose. The voltage detector must be checked on a conductor known to be energized both before and
after the test on the supposedly deenerglzed lines and equipment. If an energized conductor is not available for the
check, the detector may be checked on a spark plug of a running gasoline motor.