standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING) Utility Panelboard Generator Automatic Transfer Switch Telecommunications cable entry port Transmission Line entry port MGB Grounding Electrode Conductor UPS Panelboard Where a RF transmission line SPD is placed at the equipment shelter, equipment room or equipment area entry point and that entry point is greater than 6.1 linear metres (20 linear feet) away from the MGB's grounding electrode conductor connection to the grounding electrode system, a grounding electrode conductor shall properly installed between the SPD and the nearest accessible location of the common grounding electrode system as covered under NFPA 70-2005, Articles 810.21 and 820.100. The SPD shall also be effectively bonded back to the MGB by way of its SSGB or a ground bus conductor. UPS Electrical Service Main Disconnect Electrical Service ground Required #2 AWG Grounding Conductor for bonding Primary SPD to the MGB. MGB IPGB System Primary SPD for Telecommunication cable entry port Shelter External Ground Ring Conductor FIGURE 5-32 CABLE ENTRY GREATER THAN 6.1 LINEAR METRES (20 LINEAR FEET) FROM MGB GROUNDING ELECTRODE SYSTEM. 5.5.1.8.2 PRIMARY SURGE PROTECTION DEVICES #2 AWG grounding electrode conductor Required because telecom cable entry port is located more than 20 linear ft from MGB grounding electrode conductor SSGB for RF SPDs Alternate Transmission Line entry port Note: This configuration is to be avoided whenever possible. Primary SPDs for telephone circuits, data circuits, and control circuits shall have the ground (earth) terminal bonded to the MGB, SSGB or a dedicated ground bus conductor with an equipment grounding conductor using bonding methods described within this chapter. The grounding conductor for a single line primary SPD shall be 6 mm 2 csa (# 10 AWG) or coarser; the grounding conductor for multiple line primary SPDs shall be 16 mm 2 csa (# 6 AWG) or coarser. Where a primary SPD is placed at an entry point other than adjacent to the MGB and that point is greater than 6.1 linear metres (20 linear feet) away from the MGB's grounding electrode, a grounding electrode conductor shall properly installed between the primary SPD grounding terminal or its SSGB to the nearest accessible location on the common grounding electrode system as covered under NFPA 70-2005, Articles 800.100, 830.100. See Figure 5-32 for an example of this type of grounding configuration. In both cases, the conductors should maintain a minimum 305 mm (1 ft.) separation between cables of different cable groups, even when conductor is placed in rigid metallic conduit (ANSI-J-STD-607-A-2002). 5-50 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM 5.5.1.8.3 SECONDARY SURGE PROTECTION DEVICES All secondary SPDs shall be located as near as practical to the equipment they are protecting. A separate equipment grounding (earthing) conductor shall be used to bond each secondary SPD grounding conductor or ground terminal to the MGB, SSGB, RGB, or ground bus conductor that serves the associated equipment. The grounding conductor for a single line secondary SPD shall be 6 mm 2 csa (# 10 AWG) or coarser; the grounding conductor for multiple line secondary SPDs shall be 16 mm 2 csa (# 6 AWG) or coarser. When several secondary SPDs are installed at an equipment rack or cabinet, the SPDs should be placed at a central location within the rack or cabinet so they can be effectively bonded back to the equipment rack or cabinet RGB or back to a separately installed RGB. If a separate RGB is installed for the SPDs, it shall be effectively bonded back to the equipment ground bus system using bonding methods described in this chapter. 5.5.1.8.4 TELECOMMUNICATION CABLE METALLIC SHIELDS Telecommunication cable metallic shields shall be bonded to the site’s grounding electrode system as described herein. Where outside facility telecommunication cables are configured for a standard entrance, the metallic members of all incoming telecommunication cables, including paired-conductor and optical fiber cable, shall be grounded (earthed) to the MGB, either directly or through a SSGB at the facility’s entrance point. Each metallic member shall be effectively bonded to the grounding point with a 16 mm 2 csa (#6 AWG) or coarser green-jacketed grounding conductor, or with a transmission line ground kit, using bonding methods described within this chapter. When the internal ground system is configured for functional categories 0 - 7 or PANI, the metallic members shall be bonded to reference point 0 or P. (See ANSI T1.313-2003 and paragraph 5.4.3 on page 5-36 for an explanation of PANI grounding.) ENTRANCE CABLE CABLE ENTRANCE FFACILITY METALLIC CABLE SHIELD MGB, SSGB OR BUILDING GROUNDING ELECTRODE SYSTEM TWISTED PAIR FIGURE 5-33 STANDARD TELECOMMUNICATIONS CABLE ENTRY LOCATION PROTECTOR PRIMARY PROTECTOR GROUNDING BUS 68P81089E50-B 9/1/05 5-51
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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM<br />
5.5.1.8.3 SECONDARY SURGE PROTECTION DEVICES<br />
All secondary SPDs shall be located as near as practical to the equipment they are protecting. A<br />
separate equipment grounding (earthing) conductor shall be used to bond each secondary SPD<br />
grounding conductor or ground terminal to the MGB, SSGB, RGB, or ground bus conductor that serves<br />
the associated equipment. The grounding conductor <strong>for</strong> a single line secondary SPD shall be 6 mm 2 csa<br />
(# 10 AWG) or coarser; the grounding conductor <strong>for</strong> multiple line secondary SPDs shall be 16 mm 2 csa<br />
(# 6 AWG) or coarser. When several secondary SPDs are installed at an equipment rack or cabinet, the<br />
SPDs should be placed at a central location within the rack or cabinet so they can be effectively bonded<br />
back to the equipment rack or cabinet RGB or back to a separately installed RGB. If a separate RGB is<br />
installed <strong>for</strong> the SPDs, it shall be effectively bonded back to the equipment ground bus system using<br />
bonding methods described in this chapter.<br />
5.5.1.8.4 TELECOMMUNICATION CABLE METALLIC SHIELDS<br />
Tele<strong>communication</strong> cable metallic shields shall be bonded to the site’s grounding electrode system as<br />
described herein. Where outside facility tele<strong>communication</strong> cables are configured <strong>for</strong> a st<strong>and</strong>ard<br />
entrance, the metallic members of all incoming tele<strong>communication</strong> cables, including paired-conductor<br />
<strong>and</strong> optical fiber cable, shall be grounded (earthed) to the MGB, either directly or through a SSGB at<br />
the facility’s entrance point. Each metallic member shall be effectively bonded to the grounding point<br />
with a 16 mm 2 csa (#6 AWG) or coarser green-jacketed grounding conductor, or with a transmission<br />
line ground kit, using bonding methods described within this chapter. When the internal ground system<br />
is configured <strong>for</strong> functional categories 0 - 7 or PANI, the metallic members shall be bonded to reference<br />
point 0 or P. (See ANSI T1.313-2003 <strong>and</strong> paragraph 5.4.3 on page 5-36 <strong>for</strong> an explanation of PANI<br />
grounding.)<br />
ENTRANCE<br />
CABLE<br />
CABLE ENTRANCE FFACILITY<br />
METALLIC<br />
CABLE SHIELD<br />
MGB, SSGB<br />
OR BUILDING<br />
GROUNDING<br />
ELECTRODE<br />
SYSTEM<br />
TWISTED PAIR<br />
FIGURE 5-33 STANDARD TELECOMMUNICATIONS CABLE ENTRY LOCATION<br />
PROTECTOR<br />
PRIMARY<br />
PROTECTOR<br />
GROUNDING BUS<br />
68P81089E50-B 9/1/05 5-51
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