2.12
GROUNDING AND BONDING
2.12.1
Driven Ground Rods
Ground rods shall be [copper-clad steel conforming to UL 467] [zinc-coated
steel conforming to ANSI C135.30] [solid stainless steel] not less than
15.9 mm 5/8 inch in diameter by 3.1 m 10 feet in length [of the sectional
type].
2.12.2
Grounding Conductors
Grounding conductors shall be bare, except where installed in conduit with
associated phase conductors. Insulated conductors shall be of the same
material as the phase conductors and green color-coded, except that
conductors shall be rated no more than 600 volts. Bare conductors shall be
ASTM B 8 soft-drawn unless otherwise indicated. Aluminum is not acceptable.
2.13
SURGE ARRESTERS
Surge arresters shall comply with NEMA LA 1, IEEE C62.1, ANSI C62.2, and
IEEE C62.11, and shall be provided as indicated. Arresters shall be
[station] [intermediate] [distribution] class, rated as shown. [Arresters
for use at elevations in excess of 1.8 km 6000 feet above mean sea level
shall be specifically rated for that purpose.] Arresters shall be equipped
with mounting brackets for the indicated installations. Arresters shall be
of the [valve] [or] [metal-oxide varistor] [or] [combination
valve-metal-oxide varistor] type suitable for outdoor installations.
2.14
COORDINATED POWER SYSTEM PROTECTION
**************************************************************************
NOTE: The requirement for the studies in this
section depends on the complexity and extent of the
power system. Delete this requirement for: projects
of limited scope; projects having protective devices
which are not adjustable or for which coordination
is not possible (standard molded case circuit
breakers); projects involving simple extension of
600 volt level service to a building or facility
from an existing transformer (750 kVA or less); or
projects involving simple extension of 600 volt
level service to a building or facility from a new
transformer (750 kVA or less).
The designer will be responsible for showing and
specifying the requirements for fuses, circuit
breakers, protective relays, or other protective
devices associated with the project. The protective
devices should be selected and specified to protect
electrical power system conductors or equipment
against sustained overloads, in-rush conditions,
electrical faults, or other abnormal power system or
equipment operating conditions, in accordance with
TM 5-811-14, IEEE Std 242, and IEEE Std 141.
The complexity and extent of coordinated power
system protection depends on the type of buildings
or facilities or utilities required, on the load
demand of facilities, and on the quantity and types
SECTION 16311A
Page 64
Previous Page
