Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
3.2 GENERAL
4. PVC COATED RIGID STEEL CONDUIT: All instrumentation cables – 4-
20mA cables, or manufactured supplied cables – those that are associated with
the level transmitters, flow meters, etc. shall be routed in rigid steel conduit in
underground duct banks.
5. RIGID ALUMINUM CONDUIT: May be used in all locations. PVC coated rigid
aluminum conduit shall be used in corrosive environments or where in contact
with concrete.
6. RIGID NONMETALLIC CONDUIT: May be used in non-hazardous locations,
installed single or grouped either underground or encased in concrete.
7. LIQUID TIGHT FLEXIBLE METALLIC CONDUIT: Shall only be used to
equipment in non-hazardous locations not subject to physical damage or
excessive temperatures, requiring vibration isolation unless otherwise indicated,
6’-0” maximum length. The bending radius shall be in accordance with Chapter
9, Table 2 of the NEC and shall not deform or alter the flex jacket.
A. Size conduits as required by the National Electrical Code for the number and sizes of
wires to be drawn into the conduit. Above grade conduit less than ¾” shall not be used
unless specified otherwise. Below Grade conduit shall not be less than 1”.
B. Conduit stubbed up under free standing enclosures, such as motor control centers shall be
PVC, stubbed up 1" above the finished floor level, and shall have a PVC bell terminator
solvent welded onto each conduit end.
C. 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. Straight runs of conduit which is below the finished grade shall be rigid PVC.
Unless otherwise indicated, all other conduit shall be rigid aluminum.
D. At the transition from underground and or from concrete, protect PVC conduit from
mechanical damage by extending PVC coated rigid aluminum conduit a maximum of
12" and a minimum of 4" into the earth or concrete at the transition. For installations
where the conduit does not penetrate concrete, provide a 12” wide housekeeping pad
around conduit for transitions from underground to exposed conduit.
E. Aluminum conduit, straps, and struts shall not be in direct contact with concrete or CMU
walls, painted or not. Provide a rubber washer between the two materials.
F. Aluminum conduit which penetrates into concrete shall be factory-coated with 0.20" of
polyvinylchloride, per Spec. MIL-P-15147.
G. Conduit extending into concrete shall not be closer than 3" from adjacent conduit and
shall not be closer than 1" from any reinforcement bars.
H. PVC conduit shall not be installed above grade level, above concrete slab level, or for
any exposed installations unless specified. Conduit shall not be placed horizontally in a
concrete floor slab or a beam without the Engineer's written approval.
May 18, 2012
Conduits
Revision 0 26 05 33.01 - 4