HomeMy WebLinkAboutAddenda - GENERAL CORRESPONDENCE - GROUNDINGSection 2G - MOUNDING
2G.1 PESCRII'TION. This Section covers specififc requireauents for the fu rnishmS of all labor,
equ#=ent, and materials necessary for the insWUti,on of all pe+n w*mt grounding of all steel
structures, fenm, gates, and buildings as indicated on the drawings and as spedfed_below.
(1) C2 - National Electrical Safety Code.
2G.3 Q4N"i'RACTOR-FLTRNISI D MATi IAIS. Contractor shall furnish all required
Cadweld, equipment, and materials as specified herein and as i►idical ed on the drawings.
2G.4 Antennas shall be relocated or modified as directed by the Owner. Casts
and expelvses incurred by the Contractor in pursuit of such relocations and/or modifim6naes
shall be paid in accorclaxim with Article GC.19.
2G.5 MU§ All fences within the right-of-way, and. parallel fences within 200 feet of the
transmission Bate oenterline, shall be grounded as specified and indicated on the drawings.
Fences parallel to the centerline sloop be grounded at the following intervals:
,.. P 1
Oft
25ft
soft
7S ft
100 R
12,5 ft
150 ft
175 ft
200ft
762 ft
779 ft
823 ft
878 ft
937 ft
997ft
1AS6 ft
1,115 ft'
1,172 ft
Fences crossing the centerline shall be grounded at each edge of the right-df way. 0 the angle
of croadng is such that the distance between grounds exceeds 400 feet, additional grounds Auall
be tasteJled. so that the d6tmce between grounds within the dghtr4 way does not exceed 400
feet.
Mectric fences that cuss the centerline at an angle of less than 45 degrees, shalt be grounded at
one point on centerline by means of a 60-hertz fence filter Electric fences that cross the
centerline at an angle greater than 45 degrees, shall not be grounded. Parallel electric fences
shall be grounded at intervals directed by the Owner.
The ground wire shah be interwoven with the fence wires except on electric fences.
TECUMCAL REQUI10MEM
2G-1 TRANSMTsc;t(W IYITygmjT/'"IY~
2G.6 TES. All gates within the right -of way, and those in parallel fences within 200 feet of
the tramsmission line centerline, shall be grounded as indicated on the drawings and per ANSI
C2.
2G.7 I iJII.17lNGS. All metal bw'ldinp, roofs, gutters, whidmiUs, or other stationary objects, if
any, within the right-of-way shall be grounded as indicated or, in special instances, in
accordance with the Owner's directive.
2G.8 WORK ODUME a TRA 'TQ- IG .pAWAX. The Ctmtractor shall rwt
install any grounds on fences, gates, buildings, wutdnift and other objects outside of the
tranmcdsdon line I%ht-of-way without specific written moons from the Owner.
2G.9 INSP'I G TON. 'l'he Contractor shall not ba ldM any trenches or excavations for
grounding umwits before the Owner has verified that all Work has been completed and
accqft
2G.10 ANCB TMTS. Contractor, in the presence of the Owner, shall measure the
resistance of all structure grounds by the 3-point fall of potential method with a minimum of
three measurements being taken at different distances from the current probe.
Maximum resistance shall be no greater than 15 ohms when all grounds have been installed
and connected by temporary jumpers so that the grounds may be tested as a system.
Additional ground rod extension units shall be installed when necessary at each foundation as
indicated on the Contract Drawings until either a all ucture ground redsUmce not greater than
15 ohms is achieved or a total of four ground rod extension units have been installed.
The ground resistance test shall be completed prior to cx wecting grounds to the Wacture.
2G.11 WASUREMEW AND PAYMHVT. Payment will be made at the Unit Pdces in the
Basis of Contract Award after Owner has received the test reports in accordance with 2G.10 and
that suf6dent.ground rods have been installed and the Work is completed, Cost for all testing
shawl be included in the unit price.
M I I ' .•
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