standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
INTRODUCTION CHAPTER 7: SURGE PROTECTIVE DEVICES • Elevators • Switching of inductive loads • Lightning activity There are four major site entrances for surges that require individual attention in order to effectively protect a site and reduce the probability of damage. • AC Power • Main service • External branch circuits or feeders • Generator • Telephone/Data • Data circuits • LAN • Control • Security and card access • CCTV • RF Cabling • Antenna transmit and receive lines • Cable TV service • Tower Lighting Systems Effective grounding or earthing alone will not protect a communications facility from damage due to surges, transients, and lightning. However, an effective combination of facility grounding, equipment bonding, and properly installed Surge Protection Devices (SPDs) on all circuit conductors entering the equipment area can significantly help maximize total site protection. CAUTION Transient voltage surge suppression (TVSS) techniques using surge protection devices (SPD) alone are not enough to adequately protect a communications site. Proper grounding (earthing) and bonding shall be incorporated at a communications site in order to provide an adequate level of protection. See Chapter 4, “External Grounding,” and Chapter 5, “Internal Grounding” for grounding and bonding details and requirements. NOTE: The term “SPD” is used interchangeably with TVSS. IEEE C62.45 and UL defines TVSS as an SPD. Figure 7-1 on page 7-3 shows the minimum SPD installation complement for a typical communications facility. 7-2 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES INTRODUCTION Telephone service conduit Electrical service conduit Electrical Service Main Disconnect with Type 1 SPD Interior MGB Transmission Line SPDs bonded to MGB Equipment Room Electrical service conduit Cable TV Electrical Service Main Disconnect with Type 1 SPD Telephone and data circuit secondary SPDs must be installed at equipment within the CEB area. MGB SSGB Tower Antennas, transmission lines and exterior ground omitted for clarity. E-911 equipment and computer area External Ground System Telephone/data circuit backboard with primary SPDs Conduit to Dispatch Center Corridor Telephone and data circuit secondary SPDs must be installed at the equipment within the equipment room. Conduit(s) between Office Building and Dispatch Center AC Power, Telephone Circuits, Cable TV, CCTV, and card access control cables must all enter within the same area. Primary SPDs on CCTV, Cable TV and card access control cable bonded to MGB. CEB area Telephone circuit backboard with secondary SPDs Telephone/data circuit backboard with primary SPDs SSGB Dispatch Center Stand alone Dispatch Center with separate electrical service. Telephone/data feed from adjacent Office Building Office Building with equipment room. Building is served by separate electrical service. CCTV, Cable TV and card access control in Control Center furniture. CCTV camera mounted on building Card Access control cable Parking Area Gate with card access control FIGURE 7-1 MINIMUM REQUIRED SPD FOR TYPICAL INSTALLATION 68P81089E50-B 9/1/05 7-3
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INTRODUCTION CHAPTER 7: SURGE PROTECTIVE DEVICES<br />
• Elevators<br />
• Switching of inductive loads<br />
• Lightning activity<br />
There are four major site entrances <strong>for</strong> surges that require individual attention in order to effectively<br />
protect a site <strong>and</strong> reduce the probability of damage.<br />
• AC Power<br />
• Main service<br />
• External branch circuits or feeders<br />
• Generator<br />
• Telephone/Data<br />
• Data circuits<br />
• LAN<br />
• Control<br />
• Security <strong>and</strong> card access<br />
• CCTV<br />
• RF Cabling<br />
• Antenna transmit <strong>and</strong> receive lines<br />
• Cable TV service<br />
• Tower Lighting Systems<br />
Effective grounding or earthing alone will not protect a <strong>communication</strong>s facility from damage due to<br />
surges, transients, <strong>and</strong> lightning. However, an effective combination of facility grounding, equipment<br />
bonding, <strong>and</strong> properly installed Surge Protection Devices (SPDs) on all circuit conductors entering the<br />
equipment area can significantly help maximize total site protection.<br />
CAUTION<br />
Transient voltage surge suppression (TVSS) techniques using surge protection devices<br />
(SPD) alone are not enough to adequately protect a <strong>communication</strong>s site. Proper<br />
grounding (earthing) <strong>and</strong> bonding shall be incorporated at a <strong>communication</strong>s site in<br />
order to provide an adequate level of protection. See Chapter 4, “External Grounding,”<br />
<strong>and</strong> Chapter 5, “Internal Grounding” <strong>for</strong> grounding <strong>and</strong> bonding details <strong>and</strong><br />
requirements.<br />
NOTE: The term “SPD” is used interchangeably with TVSS. IEEE C62.45 <strong>and</strong> UL defines TVSS as an SPD.<br />
Figure 7-1 on page 7-3 shows the minimum SPD installation complement <strong>for</strong> a typical <strong>communication</strong>s<br />
facility.<br />
7-2 68P81089E50-B 9/1/05
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