standards and guidelines for communication sites - Radio And ...

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS
5.3.2.1 SSGB SPECIFICATIONS
TABLE 5-2 SSGB Specifications
The SSGB shall be a copper bus bar with predrilled holes that provide for the use of standard sized lugs.
It is recommended that the bus bar be electrotin plated for reduced contact resistance. The SSGB shall
be sized in accordance with the immediate application and consideration should be given to future
growth of the site. The SSGB shall be listed by a nationally recognized testing laboratory when it is
placed within a building facility (ANSI-J-STD-607-A-2002) and it should be listed when placed within
other type equipment locations. See Figure 5-12 for a typical layout of conductor mounting holes and
see Table 5-2 for additional specifications and requirements.
FIGURE 5-12 EXAMPLE OF SSGB
Item Specification
Material Bare, solid Alloy 110 (99.9%) copper bus bar or plate of one piece construction.
May be electrotin-plated.
Minimum Dimensions
(ANSI-STD-J-607-A-2002)
Mounting brackets Must be suitable for the application.
Height: 50.8 mm (2 in.)
Thickness: 6.35 mm (0.25 in.)
Length: Variable to meet the application requirements and allow for future growth.
305 mm (12 in) is recommended as the minimum length.
Insulators Polyester
Fiberglass
15 kV minimum dielectric strength
Flame resistant per UL 94 VO classification
Conductor mounting holes Dependent on number of conductors to be attached. Holes should be 11 mm (0.4375 in.)
minimum on 19 mm (0.75 in.) centers to permit the convenient use of two-hole lugs.
Method of attachment of grounding
conductor.
Exothermic welding
Irreversible crimp connection
Other suitable irreversible crimped 2-hole lug
68P81089E50-B 9/1/05 5-17