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

MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING)
4.7.6.2.1 GUY ANCHOR POINTS
Grounding (earthing) guy anchor points requires special attention due to the possibility of galvanic
corrosion damage to the anchor points. Although various methods for grounding guy anchor points are
possible, any variation from the requirements and guidelines in this section shall be designed by a
licensed professional engineer. Guy wire anchors shall minimally be grounded as outlined in the
following sections.
New Construction:
• The guy anchor shall not be permitted to make direct contact with soil by being encased in
reinforced concrete over the entire embedded length of the anchor. The concrete encasement shall
extend a minimum of 152 mm (6 in.) above grade.
NOTE: Encasing the anchor in reinforced concrete over the entire embedded length of the anchor helps prevent
galvanic corrosion from the guy anchor to copper components of the grounding electrode system.
Galvanized steel encased in concrete has a similar potential to that of copper (see “Miscellaneous
General Information” on page 4-38). Additionally, encasing the anchor in reinforced concrete over the
entire embedded length of the anchor will help prevent the galvanic corrosion that would otherwise
exist from the portion of the anchor in direct contact with soil to the portion encased in concrete.
35 mm 2
CSA (#2 AWG)
OR COARSER TINNED COPPER
GROUNDING CONDUCTOR
COPPER GROUND ROD
2.4 M (8 FT.) MINIMUM
610 mm
(2 FT.)
MINIMUM
GUY WIRE
CLAMPS
CONCRETE ANCHOR
152 mm
(6 IN.)
MINIMUM
GRADE
CONCRETE ANCHOR SIZED ACCORDING TO PROFESSIONAL ENGINEER
FIGURE 4-36 GUY ANCHOR POINT GROUNDING FOR NEW CONSTRUCTION
4-54 68P81089E50-B 9/1/05
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