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 INTEGRATED COMMUNICATION SITES CHAPTER 5: INTERNAL GROUNDING (EARTHING) AC Service To Tower or Antenna Mast MGB To Communication Equipment Connection from antenna is made below the MGB Down conductor Water pipe Water pipe effectively grounded NOTES: 1. 35 mm2 csa (#2 AWG) conductor for runs of 10 m (33 ft.) or less. 2. 95 mm2 csa (#3/0 AWG) conductor for runs longer than 26 m (84 ft.) 3. See Table 5-3 on page 5-27 for other cable lengths and conductor sizing requirements. FIGURE 5-42 SITE ON DIFFERENT FLOOR THAN AC SERVICE FEED, BUILDING STEEL NOT AVAILABLE AC Service To Tower or Antenna Mast MGB M To Communication Equipment Connection from antenna is made below the MGB Building Steel Water pipe Building steel effectively grounded Water pipe effectively grounded NOTES: 1. 35 mm2 csa (#2 AWG) conductor for runs of 10 m (33 ft.) or less 2. 95 mm2 csa (#3/0 AWG) conductor for runs longer than 26 m (84 ft.) 3. See Table 5-3 on page 5-27 for other cable lengths and conductor sizing requirements. FIGURE 5-43 SITE ON DIFFERENT FLOOR THAN AC SERVICE FEED, BUILDING STEEL AVAILABLE 5-70 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) FOR INTEGRATED COMMUNICATION SITES Communication Site Building Communication Site Building FIGURE 5-44 GROUNDING ROOFTOP INSTALLATIONS Antenna mounting structures and rooftop mounted tower shall follow grounding specifications with Chapter 4, paragraphs 4.8 on page 4-74 and 4.9 on page 4-79. Antenna Structure Ground Conductors 35 mm 2 csa (#2 AWG) or coarser down conductor for runs 10 m (33 ft.) or less. 95 mm 2 csa (#3/0 AWG) or coarser down conductor for runs greater than 26 m (84 ft.) Main AC service feed into building shall be bonded at entrance. Minimum 3 grounding rods in basement or garden if available Antenna Structure Ground Conductors 35 mm 2 csa (#2 AWG) or coarser down conductor for runs 10 m (33 ft.) or less. 95 mm 2 csa (#3/0 AWG) or coarser down conductor for runs greater than 26 m (84 ft.) Structural Steel See Table 5-3 on page 5-27 for other cable lengths and conductor sizing requirements. 68P81089E50-B 9/1/05 5-71
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GROUNDING (EARTHING) FOR INTEGRATED COMMUNICATION SITES CHAPTER 5: INTERNAL GROUNDING (EARTHING)<br />
AC<br />
Service<br />
To Tower or Antenna Mast<br />
MGB<br />
To Communication Equipment<br />
Connection from antenna<br />
is made below the MGB<br />
Down conductor<br />
Water pipe<br />
Water pipe<br />
effectively grounded<br />
NOTES:<br />
1. 35 mm2 csa (#2 AWG) conductor<br />
<strong>for</strong> runs of 10 m (33 ft.) or less.<br />
2. 95 mm2 csa (#3/0 AWG)<br />
conductor <strong>for</strong> runs longer than<br />
26 m (84 ft.)<br />
3. See Table 5-3 on page 5-27 <strong>for</strong><br />
other cable lengths <strong>and</strong><br />
conductor sizing requirements.<br />
FIGURE 5-42 SITE ON DIFFERENT FLOOR THAN AC SERVICE FEED, BUILDING STEEL NOT<br />
AVAILABLE<br />
AC<br />
Service<br />
To Tower or Antenna Mast<br />
MGB M<br />
To Communication Equipment<br />
Connection from antenna<br />
is made below the MGB<br />
Building Steel<br />
Water pipe<br />
Building steel<br />
effectively grounded<br />
Water pipe<br />
effectively grounded<br />
NOTES:<br />
1. 35 mm2 csa (#2 AWG) conductor<br />
<strong>for</strong> runs of 10 m (33 ft.) or less<br />
2. 95 mm2 csa (#3/0 AWG)<br />
conductor <strong>for</strong> runs longer than<br />
26 m (84 ft.)<br />
3. See Table 5-3 on page 5-27 <strong>for</strong><br />
other cable lengths <strong>and</strong><br />
conductor sizing requirements.<br />
FIGURE 5-43 SITE ON DIFFERENT FLOOR THAN AC SERVICE FEED, BUILDING STEEL AVAILABLE<br />
5-70 68P81089E50-B 9/1/05
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