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) When outside facility telecommunication cables are configured for an isolation entrance, the metallic member on the field side of the isolation gap shall be grounded back to the MGB, either directly or through a SSGB at the facility’s entrance point. The bonding point for a PANI configured bus bar will be reference point P. The metallic member on the facility side of the isolation gap shall only be bonded at the primary SPD grounding terminal, which is grounded back to the SSGB or to the MGB at the PANI reference point P. In this type environment, the metallic members of all telecommunication cables entering the facility shall be isolated with a minimum 76 mm (3 in.) isolation gap. The isolation gap shall be sealed and insulated to prevent moisture penetration and flashovers during high voltage events. The grounding conductor for each side of the metallic member shall be a 16 mm 2 csa (#6 AWG) or coarser green-jacketed grounding conductor, and the grounding conductor shall be effectively bonded to the referenced grounding point using bonding methods described within this chapter (ANSI T1.313- 2003). NOTE: Isolation gaps, which interrupt the metallic members of all cables, may be installed in some locations as a protective measure against high lightning incidence. This method should be used with caution because it tends to compensate for electrical protection deficiencies in the outside plant (ANSI T1.313-2003). Consultation with a licensed professional engineer is recommended in these instances. ENTRANCE CABLE CABLE ENTRANCE FFACILITY ISOLATION A GAP METALLIC CABLE SHIELD MGB, SSGB OR BUILDING GROUNDING ELECTRODE SYSTEM TWISTED PAIR PROTECTOR FIGURE 5-34 ISOLATION TYPE TELECOMMUNICATIONS CABLE ENTRY LOCATION PRIMARY PROTECTOR GROUNDING BUS When the outside facility telecommunication cables are configured for an insulating entrance, the metallic members shall be bonded on each side of the insulating joint. The facility side of the insulating joint shall be bonded back to the MGB, either directly or through a SSGB at the facility’s entrance point. The bonding point for a PANI configured bus bar will be reference point P. The grounding conductor for each metallic member on the facility side of the insulating joint shall be a 16 mm 2 csa (#6 AWG) or coarser, green-jacketed, grounding conductor and the grounding conductor shall be effectively bonded back the referenced grounding point using bonding methods described within this chapter. On the field side of the insulating joint, all metallic members and all associated metal are deliberately isolated from the site's common grounding electrode system. (See ANSI T1.313-2003 for additional information). 5-52 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM ENTRANCE CABLE CABLE ENTRANCE INSULATING A JOINT FIGURE 5-35 INSULATING TYPE TELECOMMUNICATIONS CABLE ENTRY LOCATION Where internal telecommunication cables incorporate a shield or metallic member, the shield or metallic member shall be effectively bonded back to the closest MGB or SSGB with a 16 mm 2 csa (#6 AWG) or coarser, green jacketed, grounding conductor at the point where cables terminate or where they are broken out. Primary SPDs for interbuilding communication cables shall be bonded to the MGB or SSGB with a 16 mm 2 csa (#6 AWG) or coarser, green jacketed, grounding conductor as describe within the chapter. When secondary SPDs are installed at the equipment location, the SPD grounding conductor shall be effectively bonded to the closest MGB or SSGB as described within this chapter (ANSI-J-STD-607-A-2002). 5.5.1.8.5 METALLIC SHIELDS FOR INTERNALLY ROUTED SIGNAL CARRYING CABLES The metallic shields of shielded RS-232 cables or similar type internally routed signal carrying cables shall be grounded (earthed) at one end only. A common shield ground wire shall not be used for input and output signals, for both high level and low level signals, for signal lines and power conductors, or for electronic signal lines and control lines. Where a signal ground (common return) conductor has been included within the cable, the signal ground wire shall only be bonded back to the shield at one end. The shield termination shall employ a minimum length pigtail between the shield and the shield pin of the connector. The size of the wire shall be as large as practical, but shall not be less than 1.5 mm 2 csa (#16 AWG) or the maximum wire size that will fit the connector pin. The unshielded length of signal cable shall not exceed 25 mm (1 in.) with a desired goal of not more than 13 mm (0.5 in.). See Figure 5-36 on page 5-53 for an example of the metallic shield grounding. See FAA-STD-019d-2002 for additional information. 2 3 7 CAPACIT P OR PVC JACKET SHIELD TO EQUIPMENT T CHASSIS FIGURE 5-36 SIGNAL CABLE SHIELD BONDING METALLIC MEMBER OF CABLE MGB, SSGB OR BUILDING GROUNDING ELECTRODE SYSTEM TWISTED PAIR PROTECTOR PRIMARY PROTECTOR GROUNDING BUS 68P81089E50-B 9/1/05 5-53 2 3 7
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BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING)<br />
When outside facility tele<strong>communication</strong> cables are configured <strong>for</strong> an isolation entrance, the metallic<br />
member on the field side of the isolation gap shall be grounded back to the MGB, either directly or<br />
through a SSGB at the facility’s entrance point. The bonding point <strong>for</strong> a PANI configured bus bar will<br />
be reference point P. The metallic member on the facility side of the isolation gap shall only be bonded<br />
at the primary SPD grounding terminal, which is grounded back to the SSGB or to the MGB at the<br />
PANI reference point P. In this type environment, the metallic members of all tele<strong>communication</strong> cables<br />
entering the facility shall be isolated with a minimum 76 mm (3 in.) isolation gap. The isolation gap<br />
shall be sealed <strong>and</strong> insulated to prevent moisture penetration <strong>and</strong> flashovers during high voltage events.<br />
The grounding conductor <strong>for</strong> each side of the metallic member shall be a 16 mm 2 csa (#6 AWG) or<br />
coarser green-jacketed grounding conductor, <strong>and</strong> the grounding conductor shall be effectively bonded<br />
to the referenced grounding point using bonding methods described within this chapter (ANSI T1.313-<br />
2003).<br />
NOTE: Isolation gaps, which interrupt the metallic members of all cables, may be installed in some locations as<br />
a protective measure against high lightning incidence. This method should be used with caution because<br />
it tends to compensate <strong>for</strong> electrical protection deficiencies in the outside plant (ANSI T1.313-2003).<br />
Consultation with a licensed professional engineer is recommended in these instances.<br />
ENTRANCE<br />
CABLE<br />
CABLE ENTRANCE FFACILITY<br />
ISOLATION A GAP<br />
METALLIC<br />
CABLE SHIELD<br />
MGB, SSGB<br />
OR BUILDING<br />
GROUNDING<br />
ELECTRODE<br />
SYSTEM<br />
TWISTED PAIR<br />
PROTECTOR<br />
FIGURE 5-34 ISOLATION TYPE TELECOMMUNICATIONS CABLE ENTRY LOCATION<br />
PRIMARY<br />
PROTECTOR<br />
GROUNDING BUS<br />
When the outside facility tele<strong>communication</strong> cables are configured <strong>for</strong> an insulating entrance, the<br />
metallic members shall be bonded on each side of the insulating joint. The facility side of the insulating<br />
joint shall be bonded back to the MGB, either directly or through a SSGB at the facility’s entrance<br />
point. The bonding point <strong>for</strong> a PANI configured bus bar will be reference point P. The grounding<br />
conductor <strong>for</strong> each metallic member on the facility side of the insulating joint shall be a 16 mm 2 csa<br />
(#6 AWG) or coarser, green-jacketed, grounding conductor <strong>and</strong> the grounding conductor shall be<br />
effectively bonded back the referenced grounding point using bonding methods described within this<br />
chapter. On the field side of the insulating joint, all metallic members <strong>and</strong> all associated metal are<br />
deliberately isolated from the site's common grounding electrode system. (See ANSI T1.313-2003 <strong>for</strong><br />
additional in<strong>for</strong>mation).<br />
5-52 68P81089E50-B 9/1/05
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