standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
GROUNDING (EARTHING) FOR STAND-ALONE EQUIPMENT SHELTERS CHAPTER 5: INTERNAL GROUNDING (EARTHING) • All communications equipment within the facility shall be bonded back to the internal grounding system as described in paragraphs 5.5.1.3 and 5.5.1.4 on page 5-44 (ANSI T1.334-2002, ANSI T1.313-2003, ANSI-J-STD-607-A-2002, FAA-STD-019d-2002, NFPA 70-2005). • All ancillary support apparatus and metallic non-current-carrying items within the facility shall be bonded back to the internal grounding system as described in paragraphs 5.4.2 on page 5-34 and 5.5.1.6 on page 5-46 (ANSI T1.334-2002, ANSI T1.313-2003, ANSI-J-STD-607-A-2002, FAA-STD-019d-2002, NFPA 70-2005). • Where multiple pieces of ancillary support apparatus are bonded back to a perimeter ground bus system, the perimeter ground bus system shall meet the installation requirements of an IPGB system as described in paragraph 5.3.7 on page 5-28. • Exception: Although not preferred, an interior perimeter ground ring system (halo) installed per the requirements of ANSI T1.334-2002 is an acceptable ground bus system for bonding ancillary support apparatus and metallic non-current-carrying items only. CAUTION Electronic equipment shall not be bonded to the internal perimeter ground ring. • If used, an interior perimeter ground ring system shall meet the following installation requirements: • All communications equipment within the facility shall be bonded to the internal grounding system as described within this chapter (ANSI T1.334-2002, ANSI T1.313-2003, ANSI-J-STD-607-A-2002, FAA-STD-019d-2002, NFPA 70-2005). • The interior perimeter ground ring shall be constructed of 35 mm2 csa (#2 AWG) or coarser copper conductor. • The interior perimeter ground ring shall be located 305 mm (1 ft.) from the ceiling where practical. • The interior perimeter ground ring should be one continuous conductor bonded together with exothermic weld or irreversible compression connection. • The interior perimeter ground ring shall be supported at approximately 610 mm (2 ft.) intervals by standoff supports. • Minimum bending radius of the interior perimeter ground ring conductor shall be 305 mm (1 ft). • The interior perimeter ground ring conductor shall be bonded to the exterior ground ring with 35 mm2 csa (#2 AWG) or coarser solid tinned copper conductors. • A grounding electrode conductor shall be placed at each corner of the shelter and bonded to the interior perimeter ground ring and exterior ground ring conductors with exothermically welded connections or irreversible compression connections. • If the length of the interior perimeter ground ring conductor exceeds 15 m (50 ft.) between the corner bonds, additional grounding electrode conductors to the exterior ground ring shall be placed at approximately equal intervals between the corner bonds. • The interior perimeter ground ring conductor shall be bonded to the MGB with a 35 mm 2 csa (#2 AWG) or coarser copper conductor. 5-56 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) FOR STAND-ALONE EQUIPMENT SHELTERS #2AWG STRANDED, OR SOLID CONDUCTOR. INTERNAL PERIMETER GROUND BUS. CONNECTED TO MGB AT ONE END. TYPICAL EQUIPMENT RACK CHASSIS AND EQUIPMENT GROUND CONDUCTORS TO TO TOWER GROUND ELECTRODE SYSTEM EQUIPMENT OUND DUCTOR TO B TELCO GROUND MGB ENTRANCE PANEL KIT WITH THROUGH WALL MOUNTING OF EXTERIOR GROUND BAR AND ENTRANCE PANEL GROUND STRAP EXOTHERMICALLY WELDED TO THE SHELTER GROUND RING. TO TOWER GROUND ELECTRODE SYSTEM CLAMP STANDOFF Service entrance panel Grounding electrode conductor Bond to system neutral at main service entrance Seal opening through wall with RTV silicone. 1.25 cm (1/2 in.) diameter pvc conduit, extend 40 cm (16") below grade. Finished Grade Exterior Ground Ring BOND CABLE TRAY TO MGB COAX ENTRY PORT BOND EXHAUST FAN AND AIR VENTS TO INTERNAL PERIMETER GROUND BUS CONDUCTOR WITH NO. 6-7G CONDUCTOR BOND DOOR FRAME TO INTERNAL PERIMETER GROUND BUS CONDUCTOR WITH NO. 6-7G CONDUCTOR BOND AC ELECTRIC SERVICE TO MGB PER NFPA 5/8"X10' COPPER CLAD GROUND ROD. UTILITY SERVICE GROUND EXOTHERMICALLY WELDED FIGURE 5-37 ROUTING OF ELECTRICAL GROUNDING ELECTRODE CONDUCTOR 68P81089E50-B 9/1/05 5-57 HVAC UNIT HVAC EQUIPMENT GROUNDING CONDUCTOR TER GROUND RING. SOFT-DRAWN TINNED SOLID COPPER CONDUCTOR RUN 30" MIN. OR BELOW FROST LINE. WEEN UTILITY GROUND AND SHELTER COUNTERPOISE. NO. 2T, SOFT-DRAWN TINNED SOLID COOPER CONDUCTOR
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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) FOR STAND-ALONE EQUIPMENT SHELTERS<br />
#2AWG STRANDED, OR SOLID<br />
CONDUCTOR. INTERNAL<br />
PERIMETER GROUND BUS.<br />
CONNECTED TO MGB AT ONE END.<br />
TYPICAL<br />
EQUIPMENT RACK CHASSIS<br />
AND EQUIPMENT GROUND<br />
CONDUCTORS TO<br />
TO TOWER<br />
GROUND<br />
ELECTRODE<br />
SYSTEM<br />
EQUIPMENT<br />
OUND<br />
DUCTOR TO<br />
B TELCO<br />
GROUND<br />
MGB<br />
ENTRANCE PANEL KIT WITH<br />
THROUGH WALL MOUNTING OF<br />
EXTERIOR GROUND BAR AND<br />
ENTRANCE PANEL GROUND<br />
STRAP EXOTHERMICALLY<br />
WELDED TO THE SHELTER<br />
GROUND RING.<br />
TO TOWER<br />
GROUND<br />
ELECTRODE<br />
SYSTEM<br />
CLAMP<br />
STANDOFF<br />
Service entrance panel<br />
Grounding electrode<br />
conductor<br />
Bond to system neutral<br />
at main service<br />
entrance<br />
Seal opening<br />
through wall with<br />
RTV silicone.<br />
1.25 cm (1/2 in.) diameter<br />
pvc conduit, extend 40 cm<br />
(16") below grade.<br />
Finished Grade<br />
Exterior Ground Ring<br />
BOND CABLE<br />
TRAY TO MGB<br />
COAX ENTRY<br />
PORT<br />
BOND EXHAUST FAN AND<br />
AIR VENTS TO INTERNAL<br />
PERIMETER GROUND BUS<br />
CONDUCTOR WITH NO. 6-7G<br />
CONDUCTOR<br />
BOND DOOR FRAME TO INTERNAL PERIMETER GROUND<br />
BUS CONDUCTOR WITH NO. 6-7G CONDUCTOR<br />
BOND AC<br />
ELECTRIC<br />
SERVICE<br />
TO MGB<br />
PER NFPA<br />
5/8"X10' COPPER CLAD GROUND ROD.<br />
UTILITY SERVICE GROUND<br />
EXOTHERMICALLY WELDED<br />
FIGURE 5-37 ROUTING OF ELECTRICAL GROUNDING ELECTRODE CONDUCTOR<br />
68P81089E50-B 9/1/05 5-57<br />
HVAC<br />
UNIT<br />
HVAC EQUIPMENT<br />
GROUNDING CONDUCTOR<br />
TER GROUND RING. SOFT-DRAWN<br />
TINNED SOLID COPPER CONDUCTOR RUN<br />
30" MIN. OR BELOW FROST LINE.<br />
WEEN UTILITY GROUND AND SHELTER<br />
COUNTERPOISE. NO. 2T, SOFT-DRAWN TINNED SOLID<br />
COOPER CONDUCTOR
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