3.9
CONNECTIONS TO BUILDINGS
3.9.1
Aerial Services
Connections to buildings shall be made at approximately the point indicated
and shall be connected to the service entrance conductors. Supports at
buildings shall be adequate to withstand required pulls; supports shall not
be rated less than 4450 N 1000 pounds. Drip loops shall be formed on
conductors at entrances to buildings, cabinets, or conduits.
Service-entrance conduits with termination fittings and conductors within
the building, including sufficient slack for connection to aerial service
cables, shall conform to the requirements of Section 16402 INTERIOR
DISTRIBUTION SYSTEM.
3.9.2
Underground Services
Connections to buildings shall be made at the point indicated and shall be
terminated at the service entrance equipment terminals. Cable pulling
shall be in accordance with Section 16375A ELECTRICAL DISTRIBUTION SYSTEM,
UNDERGROUND. Service entrance conduits with termination fittings and
conductors within the building shall conform to the requirements of Section
16402 INTERIOR DISTRIBUTION SYSTEM.
3.10
GROUNDING
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NOTE: The designer will specify the grounding
configuration and the number and type of electrodes
required. See TM 5-811-1 for guidance. Coordinate
with NFPA 70 and IEEE C2.
Some state codes do not permit grounding of metallic
items mounted on wood poles above a certain height.
In some states it is standard practice to ground all
noncurrent-carrying metal parts on all poles.
Grounding all hardware on a pole reduces the natural
BIL levels afforded with wood crossarm construction.
While reduced BIL levels in high lightning incidence
areas may result in more insulation flashovers,
bonding all hardware will result in fewer pole fires.
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Noncurrent-carrying metal parts of equipment and conductor assemblies, such
as luminaires, medium-voltage cable terminations and messengers, metal
poles, operating mechanisms of pole top switches, panel enclosures,
transformers, capacitors, recloser frames (cases) and other
noncurrent-carrying metal items shall be grounded. Additional grounding of
equipment, neutral, and surge arrester grounding systems shall be installed
at poles where indicated.
3.10.1
Grounding Electrodes
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NOTE: Modify and/or delete paragraphs in accordance
with project requirements.
The designer should investigate the soil resistivity
during the preliminary design phase to determine the
SECTION 16370A
Page 39
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