standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
TOWER DESIGN AND CONSTRUCTION CHAPTER 2: SITE DESIGN AND DEVELOPMENT FIGURE 2-4 EXAMPLE OF ANTENNA TRANSMISSION LINE DRIP LOOP • Transmission lines shall not be installed in a way that will impede climbing or safety devices. • Transmission lines shall not be mounted to climbing ladder rungs or climbing pegs. • Transmission line installation should be planned with consideration for future expansion. • Excess transmission line shall not be stored (coiled or looped) on the tower. • All transmission line connectors, splices, terminations, and jumpers shall be weatherproofed. • Transmission line shall be anchored to the tower using hardware recommended by the transmission line manufacturer for that type of tower. Spacing of anchoring hardware is also determined by the line manufacturer and is dependent on the type and size of the line. Hangers and/or angle adapters are typically provided for every 914 mm (3 ft.) of line, including any ice bridge paths. All clamps and hardware shall be corrosion-resistant. • Transmission lines shall be identified in a permanent manner using metal tags, or equivalent method located at the antenna, at the bottom of the tower, at the shelter cable entrance and inside the shelter or building. 2.12.8.1 ICE BRIDGE AND CABLE SUPPORT REQUIREMENTS The requirements below apply to installations using ice bridges and/or cable support systems between the shelter and the tower. These requirements help minimize tower or shelter damage during an earthquake. General requirements are as follows: • A self-supporting bridge and cable support system shall not be mechanically fastened to both the tower and the building, unless a nonconductive slip joint is used at one of the locations. The recommended separation between tower and ice bridge, or building and ice bridge, is 152 mm (6 in). • An ice bridge and each support leg shall be bonded to the grounding electrode system in accordance with “Cable Bridge/Ice Bridge Grounding (Earthing)” on page 4-71. • Ice bridges and cable support systems should be adequately supported and constructed from galvanized steel. • A non-self-supporting ice bridge shall be connected with a nonconductive slip joint. 2-26 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SITE DRAWINGS OF RECORD 2.13 SITE DRAWINGS OF RECORD All drawings developed in the process of site design shall be accurately maintained so that they reflect not only the intended design of the site, but also the way the site was actually built (as-built drawings). Drawings should be marked up to indicate modifications made at the site during construction. A map of the tower installation should also be maintained. Copies of all drawings and other pertinent information to support as-built site design and construction should be provided to the customer. It is recommended that the responsible party for future installations or upgrades to the site maintain and update the drawings to accurately show all subsequent modifications to the site. 68P81089E50-B 9/1/05 2-27
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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SITE DRAWINGS OF RECORD<br />
2.13 SITE DRAWINGS OF RECORD<br />
All drawings developed in the process of site design shall be accurately maintained so that they reflect<br />
not only the intended design of the site, but also the way the site was actually built (as-built drawings).<br />
Drawings should be marked up to indicate modifications made at the site during construction. A map of<br />
the tower installation should also be maintained. Copies of all drawings <strong>and</strong> other pertinent in<strong>for</strong>mation<br />
to support as-built site design <strong>and</strong> construction should be provided to the customer.<br />
It is recommended that the responsible party <strong>for</strong> future installations or upgrades to the site maintain <strong>and</strong><br />
update the drawings to accurately show all subsequent modifications to the site.<br />
68P81089E50-B 9/1/05 2-27
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