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

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM
5.4 CONNECTION METHODS FOR INTERNAL GROUNDING
(EARTHING) SYSTEM
All components of the internal grounding (earthing) system and all equipment and ancillary support
apparatus including, but not limited to, items listed in Table 5-6 on page 5-40 shall be effectively
bonded together by using the following requirements and connection methods described within this
chapter:
• General bonding requirements
• Bonding to equipment and ancillary support apparatus
• Bonding to the MGB
• Bonding to SSGB
• Bonding to RGB
• Bonding to ground bus conductor
• Bonding to communication bonding backbone conductors and grounding equalizer conductors
5.4.1 GENERAL BONDING REQUIREMENTS
The following requirements shall apply when attaching conductors to equipment, ancillary support
apparatus, ground (earth) bus bars, and when attaching one conductor to another.
• Only connection devices that require the complete removal of the conductor jacket or insulation
and result in a connection to the complete conductor surface area shall be suitable for use.
• All mechanical and compression-type connection devices shall be UL 486A listed and of the
proper size for the application. These connection devices shall be tin-plated when connected with
steel, galvanized steel or aluminum surfaces.
• All clamps and compression-type connection devices shall be UL 486A listed and shall maintain a
minimum 88% conductivity rating.
• Compression systems shall include crimped die index and company logo for purposes of
inspection.
• Listed two-hole, long barrel, compression lugs are preferred over single-hole lugs and shall be
required where two-hole lugs are referenced within this chapter.
• No more than one clamp, fitting or lug may be attached by the same bolt or bolts. An exception to
this is when a jumper from a terminal strip or other internal connection point of the same equipment
must be bonded to the equipment grounding conductor.
• No more than one conductor shall be connected by a single clamp, fitting or lug unless the clamp,
fitting, or lug is listed for multiple conductors.
• Solid conductors shall be attached to lugs and to other conductors by irreversible high compression
crimping process. Only listed irreversible compression type lugs and connection devices shall be
used.
• Connections between dissimilar metals shall not be made unless the conductors are separated by a
suitable material that is a part of the attachment device. Only attachment devices listed and
approved for use with the specific dissimilar metals may be used for this purpose.
68P81089E50-B 9/1/05 5-31