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 MIL-HDBK-232A
AWG stranded copper wire must be installed between the outer skin or frame of
the shelter and each ground rod. All rods should be bonded together using
No. 2 AWG stranded copper wire and appropriate pressure connectors. The EESS
resistance should be 10 ohms or less.
60.4 Alterative grounding. Another way to provide ground is to use a star
ground which consists of seven ground rods. One rod should be installed as
the center with the remaining six rods installed around it at 1.5 times the
rod length from the center and from each adjacent rod in the star. All rods
should be interconnected using No. 2 AWG stranded copper wire and pressure
connectors. The shelter should be connected to the EESS by connecting
multiple ground conductors between the shelter and the outer rods. If only
one ground terminal is provided of) the shelter, the ground conductor should
be connected to the center ground rod. When more than-one shelter is used in
the same area, all shelters may be connected to the star ground. If the
distance makes this impractical, each shelter should have its own EESS (see
figures A-4 and A-5).
60.5 Grounding under adverse conditions. Adverse conditions may exist which
would prevent use of conventional grounding methods for transportable systems
on granite, coral, rocky areas, desert areas, or coastal regions. To
compensate for this, a copper mesh screen, not less than 10 feet square (3
meters square), is laid on the earth surface (see figure A-6). The screen
should be constructed of No. 12 AWG stranded copper wire with apertures of
not more than 4 inches square (100 millimeters square). All crossover points
should be brazed to provide effective low-resistance bonds over the surface
of the screen. Installation in granite, coral, rock, or hard-packed desert
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