equipment or systems are not operated unless
and the radioactive material escapes. The concentration
permission from the responsible supervisor has been
obtained. A CAUTION tag cannot be used if personnel
at a maintenance shop does not approach a dangerous
or equipment could be endangered while performing
level, and the dangers of injury from exposure are slight.
evolutions using normal operating procedures; a
However, at major supply points, the storage of large
DANGER tag is used in this case.
quantities of radioactive electron tubes in a small area
may create a hazard. For this reason, personnel working
with equipment that contains radioactive electron tubes
Safety must always be practiced by persons
or in areas where many radioactive tubes are stored
working around electric circuits and equipment.
should read and become thoroughly familiar with the
Practicing safety prevents injury from electric shock and
safety precautions and safe-handling practices outlined
from short circuits caused by accidentally placing or
in Section 1, Radiac EIMB HandBook, NAVSEA
dropping a conductor of electricity across an energized
line. The arc and fire started by these short circuits, may
cause extensive damage to equipment and serious injury
Equipment needing repair must be de-energized and
No work will be done on electrical circuits or
tagged out by use of either a CAUTION or DANGER
equipment without permission from the proper authority
and until all safety precautions are taken. One of the
most important precautions is the proper use of
DANGER tags, commonly called RED tags (fig. 1-19).
A CAUTION tag (fig. 1-18) is a YELLOW tag. It
is used as a precautionary measure to provide temporary
Danger tags are used to prevent the operation of
special instructions or to show that unusual caution must
equipment that could jeopardize your safety or endanger
be exercised to operate equipment. These instructions
the equipment systems or components. When
equipment is red tagged, under no circumstances will
must state the specific reason that the tag is installed.
it be operated. When a major system is being repaired
Use of phrases such as DO NOT OPERATE WITHOUT
or when PMS is being performed by two or more repair
EOOW PERMISSION is not appropriate since
Figure 1-19.--DANGER tag (colored RED).