Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
I. Flexible metal conduit used for connecting light fixtures, i.e., fixture whips, shall be 1/2"
as a minimum. Fixture whips shall contain only three conductors: one hot, one neutral,
and one equipment grounding conductor. Other conduit types shall be 3/4" as a
minimum. The inside surface of the conduit shall be reamed smooth after it has been cut.
J. Provide conduit sizes as shown on the plans. Where hash marks are used to indicate the
number of conductors in a conduit without indicating the conduit size, provide a 3/4"
conduit for up to nine #12 conductors, and a 1" conduit for ten to 20 #12 conductors.
K. Where conduits stub up through a floor slab from below finished floor level for multilevel
structures, install a threaded fitting with PVC plug so that the top of the fitting is
flush with the concrete or finished floor surface.
L. Conduit system shall be swabbed clean prior to installation of conductors.
M. Ground conduits in accordance with the National Electrical Code and Specification 26 05
26, “Grounding & Bonding For Electrical Systems”.
N. Contractor shall properly tape PVC coated aluminum conduit where it transitions to PVC
conduit in underground concrete encased duct banks so that no aluminum conduit is in
contact with concrete encasement. Tape shall be manufactured by Scotch or approved
equal. Coordinate with tape manufacturer for type of tape to use for the installation.
O. Conduit shall not penetrate the top of NEMA 3R and NEMA 4X enclosures.
3.3 UNDERGROUND
A. Underground conduit from the service entrance disconnect switch to the equipment rack
disconnect shall be concrete encased, all other underground conduit shall be concrete
capped.
B. Bury underground conduit a minimum of 18" deep for low voltage duct banks to the top
of the concrete cap/encasement, and as shown on the plans, whichever is greater.
Backfill buried conduit banks with material which is free from large rock, paving
material, or large angular substance. Install underground conduit with the conduit duct
bank dimensions shown on the plans. Adhere to conduit spacing by using spacers at
intervals to ensure that proper spacings are maintained. The concrete shall be red in
color. Red dye for duct bank shall be mixed with concrete or the top of the duct bank
shall be painted red.
C. For installation of conduits to be used by Oncor Electric Delivery, coordinate with the
utility for exact requirements
D. Grade underground and outdoor conduits to drain free of condensation and moisture.
Provide for automatic draining at lowpoints. Install horizontal runs of conduit to provide
a natural drain for condensation without pockets or traps where moisture may collect.
E. Underground conduits shall drain to an underground structure with a floor drain, such as
a manhole or a building basement.
May 18, 2012
Conduits
Revision 0 26 05 33.01 - 5