Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
panel and panel board with connections to other equipment where specifically
indicated and noted.
C. Bonding conductors shall be continuous where possible. Where splices are
required, provide compression connectors of approved pattern. Insulate
connectors to equivalent thickness of conductors.
D. Provide grounding system for grounded circuit conductors of dry type transformer
secondaries in accordance with NEC. Use exothermic style ground connections to
building steel. Enclose grounding conductors in schedule 40 PVC conduit.
E. Provide equipment grounding conductors in all conduits containing power,
control, or instrumentation conductors on the load side of the service equipment
or on the load side of a separately derived system.
F. Comply with NEC Article 250 for sizes and quantities of equipment grounding
conductors, except that larger sizes indicated or shown on the Contract
Documents shall take precedence. Use of metallic conduit systems for equipment
grounding as recognized by the NEC shall not be permitted under this
specification.
G. Install grounding bushings on conduits at both primary and secondary entrances
to transformers. Ground transformer enclosures to bushings.
H. Install bonding jumper for flexible metal conduit unless fittings are approved for
grounding or otherwise comply with NEC.
1. Size jumper to match over-current device.
2. Green insulation.
3. Connect to grounding bushing at each end.
I. Ensure that entire electrical system is electrically continuous and permanently and
effectively grounded, including all electrical equipment and motors.
1. Locate ground rods with a minimum of two rod length from each other
and at least the same distance from any other grounding electrode.
Connect ground conductors to ground rods by means of exothermic welds
except at test wells and as otherwise indicated. Drive rods until tops are
24 inches below finished floor or final grade except as otherwise
indicated.
J. Route grounding electrode conductors along the shortest and straightest paths
possible without obstructing access or placing conductors where they may be
subjected to strain, impact, or damage, except as indicated.
K. Ensure ground rod(s) installation does not interfere with or puncture landfill cap.
GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS
WOODARD & CURRAN 26 05 26-3
