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

MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING)
• All gate posts (on both sides of the gate) shall be bonded to the nearest location of the building
ground ring using 35 mm2 csa (#2 AWG) or coarser, bare, solid or stranded, tinned, copper
conductors. The grounding conductors shall be buried to the same depth as the building ground
ring, whenever practical. (ANSI T1.313-2003, figure 3(a)).
• All gates shall be bonded to the gate supporting fence post with 16 mm 2 csa (#6 AWG) or coarser,
stranded, copper conductors. This jumper wire should be constructed with a highly flexible
conductor (ANSI T1.313-2003, figure 3(a)). See Figure 4-50 for an example.
FIGURE 4-50 GATE BONDING EXAMPLE
FLEXIBLE BONDING JUMPER
If the site has non-electrified entry deterrent fence headers of barbed wire, razor wire, or other metallic
wiring, the headers shall be grounded/bonded as follows:
• The deterrent wiring, near each corner fence post, shall be bonded to the nearest location of the
building ground ring using 35mm2 csa (#2 AWG) or coarser, bare, solid or stranded, tinned, copper
conductor. This bond may be made using the same grounding conductor used for bonding the fence
fabric. See Figure 4-49 for an example.
• Each individual run of the deterrent wiring shall be bonded using a listed bimetallic transition
connector. Each connection shall be liberally coated with a listed conductive antioxidant compound
at the point of insertion into the connector.
• The grounding conductor shall be routed so as not come into incidental contact with the deterrent
wiring, fence post, fence fabric or support apparatus for the wire. Incidental contact can create an
RF interference point.
• The grounding conductor shall follow the proper routing methods described in “Bending And
Routing Grounding (Earthing) Conductors” on page 4-29.
NOTE: Consult with Motorola Engineering or other engineering firm for the grounding requirements/
recommendations of fence systems that extend well beyond the communications building and tower.
4-70 68P81089E50-B 9/1/05