standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
AC POWER SPD REQUIREMENTS CHAPTER 7: SURGE PROTECTIVE DEVICES To Alarms Panel (Recommended) To Alarms Panel (Recommended) Shelter, equipment room or area. SPD (Surge Suppressor) Type 1 SAD/MOV SPD (Surge Suppressor) Type 2 MOV Disconnect Switch To Alarms Panel Main Service Disconnect Utility Panelboard UPS Automatic Transfer Switch Type 3 SPD optional To Alarms Panel Utility Feed AC 240/120 Single Phase 208/120 3 Phase FIGURE 7-5 SPD INTERCONNECT BLOCK DIAGRAM ‘D’ NOTES: 1. All electrical panelboards shown are collocated within the shelter, room or equipment area. 2. The SPDs shall be installed per the manufacturer’s installation instructions. 3. All conductors between the SPD and the associated disconnecting devices shall be as short as possible and routed together with a minimal number of bends or angles. 4. The SPD disconnecting device in the Utility Panelboard should be installed in the top most space available. 5. Installation of Type 3 SPDs on each critical load is recommended where the level of exposure is high. 6. Installation of Type 3 SPDs on each non-critical load that is located greater than 3 m (10 ft.) of conductor length from the panelboard is recommended where the level of exposure is high. 7-14 68P81089E50-B 9/1/05 Meter Critical Loads Non-Critical Loads UPS Panelboard Type 3 SPD optional when greater than 10 conductor feet from panelboard. Generator
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES AC POWER SPD REQUIREMENTS To Alarms Panel (Recommended) To Alarms Panel (Recommended) Shelter, equipment room or area. SPD (Surge Suppressor) Type 1 SAD/MOV SPD (Surge Suppressor) Type 2 MOV To Alarms Panel Electrical meter and service disconnect at fence or property line Utility Panelboard UPS Automatic Transfer Switch Main Panelboard with a main breaker Circuit Breaker Main Service Disconnect Type 3 SPD optional Meter FIGURE 7-6 SPD INTERCONNECT BLOCK DIAGRAM ‘E’ To Alarms Panel NOTES: 1. The main service disconnect is located outside the equipment shelter, room or area, typically at the fence or property line.. 2. The service to the equipment shelter, room or area is 3 conductors with ground for single phase or 4 3. The step-down or isolation transformer creates a separately derived system where the neutral and ground conductors are bonded together within the transformer and bonded to the equipment room MGB. The main disconnect ground and the MGB shall be bonded to the site grounding electrode system. 4. The Main panelboard shall use a main disconnecting device to serve the equipment area. 5. The Type 1 and Type 2 SPDs shall be installed per the manufacturer’s installation instructions. 6. All conductors between the SPDs and the associated disconnecting device shall be as short as possible and routed together with a minimal number of bends or angles of less than 90 degrees. 7. The SPD disconnecting devices should be installed in the top most space available in the Utility Panelboard. 8. Installation of Type 3 SPDs on each critical load are recommended at locations with high lightning activity. 9. Installation of Type 3 SPDs on each non-critical load that is located greater than 3 m (10 ft.) of conductor length from the panelboard is recommended at locations with high lightning activity. 68P81089E50-B 9/1/05 7-15 UPS Panelboard Non-Critical Loads Critical Loads Generator Step Down or Isolation Transformer Utility Feed AC Type 3 SPD optional when greater than 10 conductor feet from panelboard. 240/120 Single Phase 208/120 3 Phase 480/277 3 Phase
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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES AC POWER SPD REQUIREMENTS<br />
To Alarms Panel<br />
(Recommended)<br />
To Alarms Panel<br />
(Recommended)<br />
Shelter, equipment room or area.<br />
SPD<br />
(Surge Suppressor)<br />
Type 1 SAD/MOV<br />
SPD<br />
(Surge<br />
Suppressor)<br />
Type 2 MOV<br />
To Alarms Panel<br />
Electrical meter <strong>and</strong><br />
service disconnect at<br />
fence or property line<br />
Utility<br />
Panelboard UPS<br />
Automatic<br />
Transfer<br />
Switch<br />
Main<br />
Panelboard<br />
with a main<br />
breaker<br />
Circuit<br />
Breaker<br />
Main Service<br />
Disconnect<br />
Type 3 SPD<br />
optional<br />
Meter<br />
FIGURE 7-6 SPD INTERCONNECT BLOCK DIAGRAM ‘E’<br />
To Alarms<br />
Panel<br />
NOTES: 1. The main service disconnect is located outside the equipment shelter, room or area, typically at the fence or property line..<br />
2. The service to the equipment shelter, room or area is 3 conductors with ground <strong>for</strong> single phase or 4<br />
3. The step-down or isolation trans<strong>for</strong>mer creates a separately derived system where the neutral <strong>and</strong> ground conductors are<br />
bonded together within the trans<strong>for</strong>mer <strong>and</strong> bonded to the equipment room MGB. The main disconnect ground <strong>and</strong> the MGB<br />
shall be bonded to the site grounding electrode system.<br />
4. The Main panelboard shall use a main disconnecting device to serve the equipment area.<br />
5. The Type 1 <strong>and</strong> Type 2 SPDs shall be installed per the manufacturer’s installation instructions.<br />
6. All conductors between the SPDs <strong>and</strong> the associated disconnecting device shall be as<br />
short as possible <strong>and</strong> routed together with a minimal number of bends or angles of less<br />
than 90 degrees.<br />
7. The SPD disconnecting devices should be installed in the top most space available in the Utility Panelboard.<br />
8. Installation of Type 3 SPDs on each critical load are recommended at locations with high lightning activity.<br />
9. Installation of Type 3 SPDs on each non-critical load that is located greater than 3 m (10 ft.) of conductor length from the<br />
panelboard is recommended at locations with high lightning activity.<br />
68P81089E50-B 9/1/05 7-15<br />
UPS<br />
Panelboard<br />
Non-Critical<br />
Loads<br />
Critical<br />
Loads<br />
Generator<br />
Step Down or<br />
Isolation<br />
Trans<strong>for</strong>mer<br />
Utility Feed<br />
AC<br />
Type 3 SPD optional when greater<br />
than 10 conductor feet from<br />
panelboard.<br />
240/120 Single Phase<br />
208/120 3 Phase<br />
480/277 3 Phase
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