final bid specs 09328.pdf - Freese and Nichols, Inc.

P. At each convenience outlet, install a grounding clip attached to the outlet box and leave a
sufficient length of #12 wire with green-colored insulation to connect to the grounding terminal
at the receptacle.
Q. Grounding Manholes and Handholes: Install a driven ground rod through manhole or
handhole floor, close to wall, and set rod depth so 4 inches will extend above finished floor. If
necessary, install ground rod before manhole is placed and provide No. 1/0 AWG bare,
tinned-copper conductor from ground rod into manhole through a waterproof sleeve in
manhole wall. Protect ground rods passing through concrete floor with a double wrapping of
pressure-sensitive insulating tape or heat-shrunk insulating sleeve from 2 inches above to 6
inches below concrete. Seal floor opening with waterproof, nonshrink grout.
R. Grounding Connections to Manhole Components: Bond exposed-metal parts such as inserts,
cable racks, pulling irons, ladders, and cable shields within each manhole or handhole, to
ground rod or grounding conductor. Make connections with No. 4 AWG minimum, stranded,
hard-drawn copper bonding conductor. Train conductors level or plumb around corners and
fasten to manhole walls.
3.02 INSPECTION
A. Inspect the grounding and bonding system conductors and connections for tightness and
proper installation.
B. Use Biddle Direct Reading Earth Resistance Tester or equivalent to measure resistance to
ground of the system. Perform testing in accordance with the test instrument manufacturer’s
recommendation using the fall of potential method.
C. All test equipment provided under this section shall be approved by the ENGINEER.
D. Resistance to ground testing shall be performed during dry season. Submit test results in the
form of a graph showing the number of points measured (12 minimum) and the numerical
resistance to ground.
E. Testing shall be performed before energizing the distribution system.
F. A separate test shall be conducted for each building or system.
G. Notify the ENGINEER immediately if the resistance to ground for any building or system is
greater than five ohms. Provide additional ground rods and conductors as required to bring
the resistance to five ohms.
END OF SECTION
Grounding & Bonding for Electrical Systems 26 05 26-4
DRP09328