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 MIL-HDBK-419A
9.1.2 Shock Prevention.
Most shock hazards can be divided into two categories: unsafe equipment and unsafe acts. The most common
hazards in each category can be controlled as follows:
Power cords and drop cords with worn and/or broken insulation should be routinely replaced.
a.
All spliced cords should be removed from service.
b.
Exposed conductors and terminal strips at the rear of switchboards and equipment racks should be
c.
enclosed and warning labels installed.
Rubber mats should be installed on the floor of all enclosures containing exposed conductors and on
d.
the floor in front of high voltage switches.
High voltage switches should be of the enclosed safety type.
e.
All wiring should comply with recognized electrical codes and it should be large enough for the
f.
current being carried.
Temporary wiring should be removed as soon as it has served its purpose.
g.
The noncurrent-carrying metal parts of equipment and power tools should be grounded.
h.
The main power switch to all circuits being worked on should be locked open and tagged.
i.
Power switches should be opened before replacing fuses and fuse pullers should be used.
j.
Fuse boxes should be locked to prevent bridging or replacing with a heavier fuse.
k.
Care should be taken to prevent overloading of circuits.
l.
9.2 STATIC ELECTRICITY.
Static electricity is produced when two bodies, particularly of unlike materials, are brought into intimate
contact and then separated. When in contact, there is a redistribution of charge across the area of contact and
an attractive force is established. When the bodies are separated, work is done in opposing these attractive
forces. This work is stored in the electrostatic field which is set up between the two surfaces when they are
separated. If no conducting path is available to allow the charges to bleed off the bodies, the voltage between
the surfaces can easily reach several thousand volts as they are separated.
Static electricity is an annoyance to many individuals. Static shock can result in discomfort and even injury to
workers due to involuntary reaction. A far more dangerous aspect of static electricity is the fire and explosion
hazard. This hazard can occur in situations where a vapor-air, gas-air, dust-air, or combinations of these
9-3
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