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) Equipment room or area. SPD (Surge Suppressor) Type 1 SAD/MOV To Alarms Panel Electrical meter and disconnect are located outside the equipment room or area within another structure. UPS Utility Panelboard with a main breaker Step Down or Isolation Transformer Circuit Breaker Main Disconnect Switchgear or Distribution Panelboard Type 3 SPD optional Meter FIGURE 7-9 SPD INTERCONNECT BLOCK DIAGRAM ‘H’ NOTES: 1. The main service disconnect is located outside the equipment room or area within another structure. 2. The service to the equipment room or area is 3 conductors with ground for single phase or 4 conductors with ground for 3 phase. 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 at the same point. 4. The Utility panelboard shall use a main disconnecting device to serve the equipment area. 5. The Type 1 SPD shall be installed per the manufacturer’s installation instructions. 6. All conductors between the SPD 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 device should be installed in the topmost space available in the Utility Panelboard. 8. Installation of Type 3 SPDs on each critical load is recommended where the level of exposure is high. 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 where the level of exposure is high. 7-18 68P81089E50-B 9/1/05 UPS Panelboard Non-Critical Loads Type 3 SPD optional when greater than 10 conductor feet from panelboard. Critical Loads Utility Feed AC 240/120 Single Phase 208/120 3 Phase 480/277 3 Phase
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 are located outside the equipment room or area within the same structure. Utility Panelboard UPS Automatic Transfer Switch Main Panelboard with a main breaker Circuit Breaker Main Service Disconnect Switchgear or Distribution Panelboard Type 3 SPD optional FIGURE 7-10 SPD INTERCONNECT BLOCK DIAGRAM ‘I’ 1. The main service disconnect is located outside the equipment shelter, room or area, typically within the same building or structure. Additional distribution panelboards may be located within the structure, but are not shown. 2. The service to the equipment shelter, room or area is 3 conductors with ground for single phase or 4 conductors with ground for 3 phase. 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 is recommended where the level of exposure is high. 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 where the level of exposure is high. 68P81089E50-B 9/1/05 7-19 Meter To Alarms Panel 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 NOTES:
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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 are<br />
located outside the<br />
equipment room or area<br />
within the same structure.<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 />
Switchgear or<br />
Distribution<br />
Panelboard<br />
Type 3 SPD<br />
optional<br />
FIGURE 7-10 SPD INTERCONNECT BLOCK DIAGRAM ‘I’<br />
1. The main service disconnect is located outside the equipment shelter, room or area, typically within the same building or<br />
structure. Additional distribution panelboards may be located within the structure, but are not shown.<br />
2. The service to the equipment shelter, room or area is 3 conductors with ground <strong>for</strong> single phase or 4 conductors with<br />
ground <strong>for</strong> 3 phase.<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 short as possible <strong>and</strong> routed<br />
together with a minimal number of bends or angles of less 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 is recommended where the level of exposure is high.<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 where the level of exposure is high.<br />
68P81089E50-B 9/1/05 7-19<br />
Meter<br />
To Alarms<br />
Panel<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<br />
NOTES:
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