standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) Through wall at 45 degree angle, sealed with RTV silicone after grounding conductor is routed through 12.5 mm (0.5 in.) diameter PVC conduit FIGURE 5-9 ROUTING OF MGB GROUNDING ELECTRODE CONDUCTOR • The MGB grounding conductor should not be placed in ferrous metallic conduit. If local building codes require metallic conduit or sleeves, the grounding conductor shall be bonded to each end of the conduit using a listed grounding bushing or a bonding jumper of the same size, or coarser than, the required enclosed grounding electrode conductor (ANSI T1.334-2002, ANSI T1.313-2003 and NFPA 70-2005, Article 250.64(E)). • Unless both ends of the grounding conductor are clearly visible, the conductor must be clearly labeled on both ends (ANSI T1.333-2001). In large and multi-story commercial buildings, each communication grounding and bonding conductor should be labeled as close as practicable to its point of termination in a readable location. The label shall be nonmetallic and should include the following information shown below (ANSI-J-STD-607-A-2002). IF THIS CONNECTOR OR CABLE IS LOOSE OR MUST BE REMOVED, PLEASE CALL THE BUILDING TELECOMMUNICATIONS MANAGER 5.3.1.4 ACCEPTABLE GROUNDING (EARTHING) OF THE MGB The following are considered acceptable for use as a grounding (earthing) electrode system at a communications system facility: • In stand-alone building or equipment shelter, the MGB shall be bonded back to the common external grounding electrode system ground ring conductor (ANSI T1.334-2002 and ANSI T1.313- 2003). See Chapter 4, “External Grounding (Earthing),” for external grounding electrode system requirements. 5-14 68P81089E50-B 9/1/05 MGB GROUND RING
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS • In a small, large or multi-story building, the MGB grounding conductor shall extend from the MGB to the service equipment (power) grounding electrode system (ANSI-J-STD-607-A-2002). • Where any of the following exist at a building or structure, they shall be effectively bonded together to form a common grounding electrode system and the MGB may bond to any point on this grounding electrode system: a metallic underground water pipe, the metal frame of the building or structure, concrete-encased electrodes, a ground ring conductor encircling the building or structure, rod or pipe electrodes and plate electrodes. (See NFPA 70-2005, Article 250.50 and 250.52 for additional information.) See Chapter 4, “External Grounding (Earthing),” for external grounding electrode system bonding requirements. MIN. #2 AWG A GROUND RING LABEL BUILDING STEEL TWO HOLE LUG P A N I MIN. #2 AWG A MIN. #6 AWG A AC SYSTEM GROUND MIN. #2 AWG A MIN. #2 AWG A FIGURE 5-10 TYPES OF ACCEPTABLE GROUNDING ELECTRODE SYSTEMS 5.3.2 SUB SYSTEM GROUND (EARTH) BUS BAR A Sub System Ground Bus Bar (SSGB) may be installed within a generator or power distribution room, a communications subsystem equipment room or area separate from, but associated with, the main communications equipment room or area and located within the same building as the MGB. In some applications the SSGB may be referred to as a telecommunications ground bus bar (TCGB), an isolated zone ground bus bar (IZGB), an ancillary ground bus bar (AGB), a logic ground bus bar (LGB), a frame ground bus bar (FGB), a telephone cable ground bus bar (TCGB), or an equipment reference ground bus bar (ERGB). 68P81089E50-B 9/1/05 5-15 MIN. #4 CLAMP PLATE A ELECTRODE METAL T L UNDERGROUND W A ATER PIPE MIN. 3 M (10 FT) IN EARTH CONCRETE ENCASED ELECTRODE
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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING)<br />
Through wall at 45 degree<br />
angle, sealed with RTV<br />
silicone after grounding<br />
conductor is routed through<br />
12.5 mm (0.5 in.)<br />
diameter PVC conduit<br />
FIGURE 5-9 ROUTING OF MGB GROUNDING ELECTRODE CONDUCTOR<br />
• The MGB grounding conductor should not be placed in ferrous metallic conduit. If local building<br />
codes require metallic conduit or sleeves, the grounding conductor shall be bonded to each end of<br />
the conduit using a listed grounding bushing or a bonding jumper of the same size, or coarser than,<br />
the required enclosed grounding electrode conductor (ANSI T1.334-2002, ANSI T1.313-2003 <strong>and</strong><br />
NFPA 70-2005, Article 250.64(E)).<br />
• Unless both ends of the grounding conductor are clearly visible, the conductor must be clearly<br />
labeled on both ends (ANSI T1.333-2001). In large <strong>and</strong> multi-story commercial buildings, each<br />
<strong>communication</strong> grounding <strong>and</strong> bonding conductor should be labeled as close as practicable to its<br />
point of termination in a readable location. The label shall be nonmetallic <strong>and</strong> should include the<br />
following in<strong>for</strong>mation shown below (ANSI-J-STD-607-A-2002).<br />
IF THIS CONNECTOR OR CABLE IS LOOSE OR MUST BE<br />
REMOVED, PLEASE CALL THE BUILDING<br />
TELECOMMUNICATIONS MANAGER<br />
5.3.1.4 ACCEPTABLE GROUNDING (EARTHING) OF THE MGB<br />
The following are considered acceptable <strong>for</strong> use as a grounding (earthing) electrode system at a<br />
<strong>communication</strong>s system facility:<br />
• In st<strong>and</strong>-alone building or equipment shelter, the MGB shall be bonded back to the common<br />
external grounding electrode system ground ring conductor (ANSI T1.334-2002 <strong>and</strong> ANSI T1.313-<br />
2003). See Chapter 4, “External Grounding (Earthing),” <strong>for</strong> external grounding electrode system<br />
requirements.<br />
5-14 68P81089E50-B 9/1/05<br />
MGB<br />
GROUND RING
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