a. Static grounds must not be made to gas, steam, air lines, dry pipe
sprinkler systems, or air terminals of the lightning protection system.
b. Static grounds are made to water pipes, ground cones, buried copper
plates, driven ground rods, or to down conductors.
c. All grounds must be interconnected if the building is equipped with
a lightning protection system.
3.
Check the equipment grounding system test record.
These systems are
tested and inspected at locally determined intervals; inspection and test
records will be available at the maintenance facility.
a. Equipment that has been inactive for more than one month must be
visually inspected.
b. If the equipment has been inactive more than six months, it must be
tested for resistance and continuity.
c. If the equipment will be used in a hazardous location (operations
where a static spark discharge may be dangerous), all conductive parts of
equipment must be grounded. In this case, resistance should not exceed 25
ohms unless 10 ohms is required for lightning protection.
d. In non-hazardous locations, nonelectrical equipment need not be
grounded unless grounded for static dissipation.
It should be grounded
however, if the building has a lightning protection system.
4.
Check construction of floors and work surfaces for cleaning ease, and
for possible cracks where explosives may lodge.
a. Subfloors, finished flooring, and work surfaces must not wrinkle or
buckle under operating conditions.
b. If the planned operation could emit combustible dusts or flammable
vapors or gases, ferrous metal surfaces must not be coated with aluminum
paint because of the potential sparking hazard.
c. Non-sparking floors and work surfaces must not spark when stroked
vigorously with a hardened steel file.
d. When chemical operations are conducted, floor surfaces must be
sealed or treated to prevent agent contamination.
Coating or sealing
materials must not react with the agent.
e. When washing is required, surfaces must be capable of
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MM4673
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