withstanding repeated applications of hot water.
5.
Conductive
floors and conductive shoes must be used for grounding
personnel where
explosives have an electrostatic sensitivity of 0.1 joule or
less. Primers,
initiators, detonators, igniters, tracers, and incendiaries
are examples of
such sensitivity.
a. When personnel come into possible contact with explosives,
conductive floors must be installed unless the hazards of dust-air or
flammable vapor-air mixtures are eliminated.
Precautions may be taken
through adequate housekeeping, dust collection, ventilation, or solvent
recovery methods.
b. Conductive floors and footwear are not required throughout a
building or room if the hazard remains localized.
If the hazard remains
localized, conductive mats or runners may be used.
These mats or runners
will be subject to the same specifications and test requirements as
conductive floors.
c. Conductive floors are also required where operations are performed
involving:
(1)
Loose, unpacked ammunition with electric primers.
(2)
Exposed electro-explosive devices; e.g., squibs, detonators.
(3)
Electrically initiated items with exposed electric circuitry;
e.g., rockets.
(4)
Hazardous materials that could be ignited by a static discharge
from the human body.
6.
Conductive floors must be non-sparking material such as lead,
conductive rubber or conductive flooring composition, and shall meet the
following requirements in addition to those given in paragraph 5:
a. The flooring and its grounding
system
must
provide
electrical
resistance not to exceed 1,000,000 ohms.
b. The surface of the installed floor must be free from cracks and be
reasonably smooth, and the material must not slough off, wrinkle or buckle
under operating conditions.
c. Where conductive floors and shoes are required, the resistance
between the ground and the wearer shall not exceed 1,000,000 ohms, which is
the total resistance of floor to ground. When conductive floors and shoes
are required, table
10
MM4673
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