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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) FOR STAND-ALONE EQUIPMENT SHELTERS
5.6.1 INSTALLATION REQUIREMENTS FOR STAND-ALONE SHELTERS
The following are the grounding requirements for stand-alone equipment shelter installations:
• All towers, antenna structures, transmission lines, and other outside metallic items associated with
the facility shall be effectively bonded back to a common grounding electrode system as described
in Chapter 4, “External Grounding (Earthing).” (ANSI T1.334-2002, ANSI T1.313-2003, ANSI-J-
STD-607-A-2002, NFPA 780-2004, FAA-STD-019d-2002)
• The internal grounding system shall have a MGB established within the facility that is effectively
bonded to the common grounding electrode system as described in Master Ground (Earth) Bus Bar
beginning on page 5-9. (ANSI T1.334-2002, ANSI T1.313-2003, FAA-STD-019d-2002, NFPA 70-
2005)
• Where the main electrical service disconnect or the main electrical service panelboard is not
installed on the same wall as the transmission line entry port, the MGB shall be located as close to
the panelboard as practicable and it shall be installed to maintain clearances required by applicable
electrical codes.
• The grounding electrode conductor for the electrical service neutral to ground bond shall be
established in the main disconnect and bonded back to the shelter common external grounding
electrode system as described within Chapter 4, “External Grounding (Earthing),” and Chapter 6,
“Power Sources.” The main disconnect grounding electrode conductor shall meet all installation
requirements of applicable local and jurisdictional electrical codes (NFPA 70-2005, Article
250.64). Some acceptable examples of the grounding electrode conductors routing and bonding to
the common external grounding system are provided in Figure 5-37.
• The electrical service alternating current equipment ground (ACEG) bus (when installed) or the
main electrical service enclosure shall be bonded to the MGB with a 35 mm2 csa (#2 AWG) green
jacketed grounding conductor, using UL 486A listed two-hole compression type lug
(ANSI T1.334-2002).
• All other communications system power sources shall be effectively bonded back to the MGB as
described in paragraphs 5.5.1.1 on page 5-42 and 5.5.1.2 on page 5-43. (ANSI T1.334-2002, ANSI
T1.313-2003, ANSI T1.333-2001, FAA-STD-019d-2002, NFPA 70-2005.)
• All outside facility telecommunications cables shall have their metallic shields properly bonded
back to the internal grounding system as described in paragraph 5.5.1.8.4 on page 5-51 (ANSI
T1.334-2002, ANSI T1.313-2003, ANSI-J-STD-607-A-2002, FAA-STD-019d-2002,
NFPA 70-2005).
• All outside facility telecommunications cable primary SPDs at the facility entrance location shall
be properly bonded to the internal grounding system as described in paragraph 5.5.1.8.2 on page 5-
50 (ANSI T1.334-2002, ANSI T1.313-2003, ANSI-J-STD-607-A-2002, FAA-STD-019d-2002,
NFPA 70-2005).
• All transmission lines and coaxial cable RF SPDs at the cable entry location shall be bonded to the
internal grounding system as described in paragraph 5.5.1.8.1 on page 5-49 (ANSI T1.334-2002,
FAA-STD-019d-2002, NFPA 70-2005).
• All externally routed power circuits, tower lighting conductors, video cables, telecommunications,
alarm and control cables and RF transmission lines shall have SPDs installed as described in
Chapter 7, “Surge Protective Devices,” and the SPDs shall be effectively bonded back to the
external or internal grounding system as described within this chapter (ANSI T1.334-2002;
FAA-STD-019d-2002).
68P81089E50-B 9/1/05 5-55