standards and guidelines for communication sites - Radio And ...

SPECIAL GROUNDING (EARTHING) SITUATIONS CHAPTER 4: EXTERNAL GROUNDING (EARTHING)
FIGURE 4-70 GROUNDING ELECTRODE SYSTEM WITH GROUND PLATES
NOTE: Extend radial grounding conductors as
allowed by available soil. See “Radial
(Counterpoise) Grounding
Conductors” on page 4-24.
• Installation of building radial grounding conductors in a trench extending away from the building at
each corner. The radial grounding conductors shall be buried as deep as the soil will allow. The
radial grounding conductors shall bond to the building ground ring using exothermic welding or
listed irreversible high-compression fittings. The radial grounding conductors should be encased in
a grounding electrode encasement material. A conductive concrete may be the best grounding
electrode encasement material for use in shallow topsoil environments, since the conductive
concrete would not require a covering of topsoil for protection. Each radial grounding conductor
may have ground plates installed every 1.8 to 4.9 m (6 to 16 ft.) along its length. See Figure 4-71.
• Installation of tower radial grounding conductors in a trench extending away from the tower and
building. The radial grounding conductors shall be buried as deep as the soil will allow. The radial
grounding conductors shall bond to the tower ground ring using exothermic welding or listed
irreversible high-compression fittings. The radial grounding conductors should be encased in a
grounding electrode encasement material. A conductive concrete may be the best grounding
electrode encasement material for use in shallow topsoil environments, since the conductive
concrete would not require a covering of topsoil for protection. Each radial grounding conductor
may have ground plates installed every 1.8 to 4.9 m (6 to 16 ft.) along its length. See Figure 4-71.
4-98 68P81089E50-B 9/1/05