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Project Number: 228730
Issue Date: August 2017

3.

WWTE SCADA Upgrades
Nashua, NH

Provide factory applied nylon or polyvinyl chloride (PVC) external jackets
on wires and cables for pulls in raceways over 100 feet in length, for pulls
in raceways with more than three equivalent 90 degree bends, for pulls in
conduits underground or under slabs on grade, and where indicated.

B. Service & Distribution Wiring

1.

2.

3.

4.

98 percent conductivity copper
600 volt insulation, type XHHW
ULL. listed for underground use in wet locations at 75° C.

Use XHHW for #4 and larger and THHN/THWN or XHHW for #6 and
smaller.

C. Branch-Circuit Wiring

1.

2.

5.
6.
D. Splices

1.

98 percent conductivity copper

600 volt insulation, type, THWN/THHN, or XHHW

Stranded conductor: #14 AWG and larger

Minimum branch circuit: #12 AWG

Minimum #10 AWG for 120 volt circuits more than 100 feet long.

Minimum #10 AWG for 277 volt circuits more than 230 feet long.

No. 10 and smaller with 600-volt pressure type insulated connector of
wire-nut type, or equal; soldered and crimped type not allowed. Ideal type
“wire nut” Buchanan type “B-Cap” and Minnesota Mining (3M) type
“Scotchlok”.

No. 8 and larger with solderless lugs or solderless connectors of Lock-tite
or similar type properly taped with plastic insulating tape, Minnesota
Mining Co. #33, or equal, then two half-lap servings of friction tape,
Manson, or equal.’

Wire connector systems for use with underground conductors shall be UL
listed specifically for such use.

Service entrance conductors shall be installed without splices. Electrical
equipment feeders shall be spliced only where shown or specifically

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

WOODARD & CURRAN 26 05 19-3

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

approved. Control and metering conductors shall be installed without
splices.

5. All splices shall be made only by specific permission of the Engineer and
then only in manholes or pull boxes and shall be sealed watertight with a
heat-shrunk insulation.

6. Tighten electrical connectors and terminals in accordance with
manufacturer’s published torque tightening values. Where manufacture’s
torqueing requirements are not indicated, tighten connectors and terminals
to comply with tightening torques specified in UL Standards 486A and
A86B.

7. Use UL listed splice for all underground wires, ducts buried, in conduit
and in ducts. Connectors and splices shall be waterproof.

PART 3 —- EXECUTION

3.01 WIRE AND CABLE INSTALLATION

A.

All wire and cables shall be installed in conduit of size and type indicated on the
drawing and specifications.

Install electrical cables, wires, and connectors in compliance with NEC.

Pull conductors simultaneously where more than one is being installed in same
raceway. Use UL listed pulling compound or lubricant, where necessary.

Use pulling means including, fish tape, cable, rope, and basket weave wire/cable
grips which will not damage cables or raceways. Do not use rope hitches for
pulling attachment to wire or cable.

Conceal all cable in finished spaces.

Install exposed cable parallel and perpendicular to surfaces or exposed structural
members, and follow surface contours, where possible.

Conductors shall be sized such that voltage drop does not exceed 3 percent for
branch circuits or 5 percent for feeder/branch circuit combination.

Provide adequate length of conductors within electrical enclosures and train the
conductors to terminal points with no excess. Bundle multiple conductors, with
conductors larger than No. 10 AWG cabled in individual circuits. Make
terminations so there is no bare conductor at the terminal.

All feeder and branch circuit wiring shall be color coded at all termination and
splice locations. System neutrals shall be designated in addition to phase
conductors. Equipment grounds shall be green.

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

WOODARD & CURRAN 26 05 19-4

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

J.

The number of conductors shown on the Drawings is not necessarily the correct
number required. As many conductors as are required in each case shall be
installed. In general, grounding conductors are not scheduled.

In general, wiring for the following systems shall be installed in separate conduits.
Do not mix categories in a single raceway.

1. 120 volt power wiring.
2. 120 volt control wiring, including, digital input and output signals.
3. 24 volt DC control wiring, including, digital input and output signals.

4. 24 volt DC analog control wiring (4-20mA).
5. Communications wiring.

6. Special & Emergency Systems

3.02 FIELD QUALITY CONTROL

A.

The Contractor shall test each electrical circuit after permanent cables are in place
with terminators installed, but before cable or wire is connected to equipment or
devices to demonstrate that each circuit is free from improper grounds and short
circuits.

The Contractor shall Megger Test, the insulation resistance between phases and
from each phase to ground for each of the following feeder and motor branch
circuits:

1. Secondary Service Entrance

2. Electrical Distribution Equipment (Main Circuit Breaker, Motor Control
Center, Panelboards, etc.)

3. Transformers
4. Motors
All Megger testing shall be provided to the Engineer.

Measure the insulation resistance with a digital "Megger" insulation testing
instrument in accordance with manufacturer’s recommendations. All test
instruments are to be provided by the Contractor.

If any insulation resistance measures less than 50 megohms, the cable shall be
considered faulty with the cable failing the insulation test. In moist environments,
bag the ends of the cable to prevent a faulty Megger test.

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

WOODARD & CURRAN 26 05 19-5

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

F. Any cable which fails the insulation tests or which fails when tested under full
load conditions shall be replaced with new cable for the full length and retested at
no additional cost to Owner.

G. The below grade service or feeder splice shall be water immersion Megger tested.
Each splice shall be immersed in a grounded water immersion bath for 24
continuous hours prior to and during the test. Criteria for failure shall be as
described for cable above.

END OF SECTION

LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES
WOODARD & CURRAN 26 05 19-6

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

SECTION 26 05 26

GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

PART 1-— GENERAL

1.01 DESCRIPTION OF WORK

A.

Provide all labor, tools, equipment, materials and appurtenances necessary to
furnish and install grounding materials in accordance with the Drawings and as
specified herein. This section includes solid grounding of electrical systems and
equipment.

1.02 REFERENCES

A.

The publications listed below form a part of this specification to the extent
referenced. The publications are referred to within the text by the basic
designation only. Unless otherwise noted, the most recent version of the listed
publications, including revisions, at time of bid opening shall apply.

NATIONAL ELECTRICAL CODE (NEC), as applicable to electrical grounding
and bonding, Art. 250.

UNDERWRITERS' LABORATORIES, INC. (UL)
1. UL 467 Electrical Grounding and Bonding Equipment

INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS (IEEE)
IEEE 81 AND 142

1. 1-1983 TEEE Guide for Measuring Earth Resistivity, Ground Impedance,
and Earth Surface Potentials of a Grounded System (Part 1)

2. 141-1993 IEEE Recommended Practice for Electric Power Distribution
for Industrial Plants

3. 142-1991 IEEE Recommended Practice for Grounding of Industrial and
Commercial Power Systems

1.03 SUBMITTALS

A.

B.

All submittals shall have pertinent numerical data and information specified in the
"English" language using "English" units. The submittals shall include but are not
limited to the following in addition to General Requirements.

Product Data

GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

WOODARD & CURRAN 26 05 26-1

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

1. Provide product data for all grounding equipment and appurtenances,
including but not limited to; wires, connectors, lugs, clamps, ground rods,
bonding jumpers and accessories.

PART 2-— PRODUCTS

2.01 GENERAL

A.

Provide electrical grounding system with assembly of materials required for
complete installation including wires/cables, connectors, lugs, clamps, ground
rods, bonding jumpers and accessories.

Provide electrical grounding conductors for grounding connections matched to
power supply wiring materials and sized according to NEC.

Provide electrical connectors, lugs, clamps, boding jumpers and accessories as
recommended by the respective manufacturer for the particular application, unless
other indicated.

Ground Rods: Solid copper clad, 5/8-inch diameter by 10 feet long.

Insulated Conductors: Green in color.

Ground Bus. Bare annealed copper bars of rectangular cross section, ¥-inch x 3-
inch x length as required, with 98 percent conductivity, rigidly attached to

structure.

Bonding Strap Conductor/Connectors: Soft copper, 0.05 inch thick and 2-inches
wide, except as indicated.

Pressure Connectors: High conductivity plated units.
Bolted Clamps: Heavy-duty units listed for the application.

Exothermic Welded Connections: Provided in kit form and selected for the
specific types, sizes, and combinations of conductors and other items to be
connected.

PART 3 — EXECUTION

3.01 GROUNDING & BONDING

A.

Ground main service entrance ground bus or lug to neutral of incoming service, to
enclosure and to ground rod. Install grounding bushings or service conduits. Use
exothermic style ground connections to the ground rod. Use of conduit system for
ground conductor shall not be allowed.

Provide and install 600 volt insulated bonding conductors throughout the
distribution system with connection to bonding (or grounding) terminal on each

GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

WOODARD & CURRAN 26 05 26-2

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

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

3.02 BONDING FOR OTHER TRADES

A.

Signal raceways, water piping, heating piping and metallic air ducts shall be
bonded together and to the grounding conductor with No. 8 soft drawn bare solid
conductors. Connections to pipes shall be made with cast clamps of like material
as the pipes to which attached, to ducting terminated in a secure manner by best
practical means, bonding across any flexible or insulated connections.

All bonding conductors shall be installed in a neat manner properly shaped for
contour of surface involved and properly supported. At locations remote from the
main service entrance panel boards, bond to the largest raceway nearby.

3.03 FIELD TESTING

A.

Measure ground resistance without the soil being moistened by any means other
than natural precipitation or natural drainage or seepage and without chemical
treatment or other artificial means of reducing natural ground resistance. Perform
tests by the three-point fall of potential method in accordance with Section 9.03 of
IEEE 81. Simple moisture addition is not acceptable.

Ground/resistance maximum values shall be as follows:

1. Equipment rated 500 kva and less: 10 ohms.

2. Equipment rated 500 kVA to 1000 Kva: 5 ohms.

3. Equipment rated over 1000 kVA: 3 ohms.

4. Unfenced substations and pad mounted equipment: 5 ohms.
5. Fence Grounds: 10 ohms.

Where ground resistances exceed specified values, and if directed, modify the
grounding system to reduce resistance values.

END OF SECTION

GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

WOODARD & CURRAN 26 05 26-4

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH

SECTION 26 05 34

RACEWAYS, BOXES AND SUPPORTING DEVICES

PART 1 - GENERAL

1.01 DESCRIPTION OF WORK

A.

The Contractor shall provide the labor, tools, equipment, and materials necessary
to furnish and install raceways, boxes and supporting devices in accordance with
the plans and as specified herein.

Types of products specified in this section include:

1. Conduit, Raceways & Fittings
2. Supporting Devices
3. Boxes and fittings

1.02 RELATED DOCUMENTS

A.

Drawings and general provisions of the Contract, including General and
Supplementary Conditions apply to this section.

Related Sections

1. Division 26: Section 26 05 00 COMMON WORK RESULTS FOR
ELECTRICAL

2. Division 26: Section 26 05 19 LOW-VOLTAGE ELECTRICAL POWER
CONDUCTORS AND CABLES

1.03 QUALITY ASSURANCE

A.

B.

Reference Standards.

UNDERWRITER'S LABORATORIES, INC. (UL) LISTING AND LABELING
1. Items provided under this section shall be listed and labeled by UL.
NATIONAL ELECTRICAL CODE (NEC)

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

RACEWAYS, BOXES AND SUPPORTING DEVICES

WOODARD & CURRAN 26 05 34-1

Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
1.04 SUBMITTALS
A. Furnish manufacturer's product data, test reports, and material certifications as
required.
1. Product data for cabinets and enclosures with classification higher than
NEMA 1.
2. Shop drawings for floor boxes and boxes, enclosures and cabinets that are
to be shop fabricated (non-stock items).
PART 2 - PRODUCTS
2.01 CONDUIT, RACEWAYS & FITTINGS
A. Provide conduit with %4-inch diameter minimum, except where specifically shown
smaller on the Contract Drawings.
B. Conduit, connectors, and fittings shall be approved for the installation of electrical

conductors.

C. Refer to Table 3.01A for approved conduit installation guidelines.

1. Electrical Metallic Tubing (EMT)

a.

EMT shall be rigid metallic conduit of the thinwall type in straight
lengths, elbows, or bends and must conform to NEMA C80.3 and
the requirements of UL 797.

Couplings and connectors shall be steel compression fittings.
Where EMT enters outlet boxes, cabinets, or other enclosures,
connectors must be the insulated-throat type, with a locknut.
Fittings must meet the requirements of NEMA FB 1.

2. Rigid Galvanized Steel Conduit

a.

WOODARD & CURRAN

Rigid steel conduit (RGS), including couplings, elbows, bends, and
nipples, shall conform to the requirements of UL 6 and NEMA
C80.1 Steel fittings shall be galvanized by the hot-dip process.

Fittings for rigid steel conduit shall be threaded and shall conform
to NEMA FB 1.

Gaskets shall be solid for fittings sized 1-1/2 inches and less.
Conduit fittings with blank covers shall have gaskets except in
clean, dry areas or at the lowest point of a conduit run where
drainage is required.

RACEWAYS, BOXES AND SUPPORTING DEVICES
26 05 34-2