The probable effects of shock are shown in table
Table 2-3.-Probable Effects of Electric Shock
It is imperative to recognize that the resistance
of the human body cannot be relied on to prevent a
fatal shock from 115 volts or even lower voltages.
Fatalities from as low as 30 volts have been recorded.
Tests have shown that body resistance under unfavor-
able conditions may be as low as 300 ohms and pos-
sibly as low as 100 ohms from temple to temple if
the skin is broken.
Volt for volt, dc potentials are normally not as
dangerous as ac potentials. This is shown by the fact
that reasonably safe let-go currents for 60-Hz ac
are 9.0 mA for men and 6.0 mA for women, whereas
the corresponding values for dc are 62.0 mA for men
and 41.0 mA for women.
The instruction to personnel in nonelectrical
ratings regarding the safety precautions they must
observe when using electrical equipment should em-
phasize the following points:
NEVER use any personal portable electrical
equipment aboard ship unless it has been in-
spected and approved.
NEVER use portable electrical equipment if
there is reason to believe it might be defective.
Have it tested by authorized personnel.
NEVER make repairs yourself. All repairs
must be made by authorized personnel only.
ALWAYS visually inspect portable electrical
equipment before you use it. Look for dam-
aged plugs, frayed cords, broken or missing
ground connections, etc.
ALWAYS report any shock you receive from
electrical equipment, regardless of how slight.
General Safety Promotion
Promoting safety within the electronics division
or on the ship in general requires that you, as the FC1
or FCC, become safety conscious to the point that you
automatically consider safety in every job or opera-
tion. Through the use of safety reminders and by your
personal example, you pass safety consciousness on
to other personnel.
You must be thoroughly familiar with section D5
of Navy Safety Precautions for Forces Afloat, OP-
NAVINST 5100.19. This is the primary source of
general safety rules and regulations. Safety informa-
tion is also given in the Electronics Installation and
Maintenance Book, General, NAVSEA SE000-00-
The security of the United States, in general, and
of naval operations, in particular, depends in part on
successfully safeguarding classified information. All
FCs must be security conscious to the point that they
automatically exercise proper discretion in performing
their duties and do not think of security of information
as something separate from other matters. By doing
so, security of classified information becomes a nat-
ural element of every task and not an additional bur-
You should be thoroughly familiar with the Depar-
tment of the Navy Information and Personnel Security
Program Regulation, OPNAVINST 5510.1. Following
its guidance should be second nature to you.