Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
C. Install ground cables in conduits above grade or directly buried in earth to a depth of not
less than 12" below grade. Installation to provide sufficient mechanical protection so as
not to break ground cables or connections.
D. Install ground cables continuously between connections. Splices shall not be permitted,
except where indicated on the plans. Where ground cables pass through floor slabs,
buildings, etc., and when not in metallic enclosures, provide a sleeve of approved, nonmetallic
materials.
E. Install a green-colored, equipment grounding conductor in raceways. Size conductors in
accordance with NEC Article 250.
F. Where ground wire is directly buried in earth or concrete, use standard bare tinned copper
cable, in all other cases install a green-colored insulation, equipment grounding
conductor. Size conductors in accordance with NEC Article 250. Provide grounding
conductors as required per the NEC.
G. Metal conduits stubbed up into switchgear, motor control center or other electrical
equipment shall be terminated with insulated grounding bushings and connected to the
equipment ground bus. Size the grounding wire in accordance with applicable sections of
the National Electrical Code.
H. Provide exothermic weld connection for extension to existing stub-up ground conductors.
I. Bonding Straps and Jumpers: Install in locations accessible for inspection and
maintenance, except where routed through short lengths of conduit.
1. Provide grounding and bonding jumpers as required per the NEC.
2. Bonding to Structure: Bond straps directly to basic structure, taking care not to
penetrate any adjacent parts.
3. Bonding to Equipment Mounted on Vibration Isolation Hangers and Supports:
Install so vibration is not transmitted to rigidly mounted equipment.
4. Use exothermic-welded connectors for outdoor locations, but if a disconnect-type
connection is required, use a bolted clamp.
J. Grounding and Bonding for Piping:
1. Metal Water Service Pipe: Install insulated copper grounding conductors, in
conduit, from building's main service equipment, or grounding bus, to main
metal water service entrances to building. Connect grounding conductors to
main metal water service pipes, using a bolted clamp connector or by bolting a
lug-type connector to a pipe flange, using one of the lug bolts of the flange.
Where a dielectric main water fitting is installed, connect grounding conductor
on street side of fitting. Bond metal grounding conductor conduit or sleeve to
conductor at each end.
2. Water Meter Piping: Use braided-type bonding jumpers to electrically bypass
water meters. Connect to pipe with a bolted connector.
3. Bond each aboveground portion of gas piping system downstream from
equipment shutoff valve.
K. Bonding Interior Metal Ducts: Bond metal air ducts to equipment grounding conductors
of associated fans, blowers, electric heaters, and air cleaners. Install a copper bonding
jumper to bond across flexible duct connections to achieve continuity.
May 18, 2012
Grounding & Bonding for Electrical Systems
Revision 0 26 05 26 - 3