**************************************************************************
USACE / NAVFAC / AFCESA / NASA
UFGS-26 13 00.00 25 (July 2006)
------------------------------Preparing Activity: NAVFAC
Superseding
Southeast
UFGS-S-16345N (March 2001)
Use in lieu of UFGS-26 13 00.00 20
UNIFIED FACILITIES GUIDE SPECIFICATIONS
Use for Southeast projects only
**************************************************************************
SECTION TABLE OF CONTENTS
DIVISION 26 - ELECTRICAL
SECTION 26 13 00.00 25
PAD-MOUNTED SWITCHGEAR
07/06
PART 1
GENERAL
1.1
REFERENCES
1.2
RELATED REQUIREMENTS
1.3
SUBMITTALS
1.4
QUALITY ASSURANCE
1.4.1
Pad-Mounted Switchgear
PART 2
PRODUCTS
2.1
PAD-MOUNTED SWITCHGEAR
2.1.1
Electrical Ratings and Standards
2.1.2
Switchgear Configuration
2.1.3
Switchgear Enclosure
2.1.4
Switch Construction
2.1.5
Bushings
2.1.6
Switch Operation
2.1.7
SF6 Refill Cylinders
2.1.8
Cable Connectors
2.1.8.1
Load-Break Connectors
2.1.8.2
Dead-Break Connectors
2.1.9
Electronic Overcurrent Protection
2.1.9.1
Vacuum Interrupter Switches
2.2
SOURCE QUALITY CONTROL
2.2.1
Test Schedule
2.2.2
Paint Qualification Tests
2.2.3
Load-Break Switches Production and Design Tests
2.2.4
Calibration Schedule
2.2.5
Formal Request for Settings
2.3
NAMEPLATES AND WARNING SIGNS
PART 3
3.1
3.2
EXECUTION
INSTALLATION
GROUNDING
SECTION 26 13 00.00 25
Page 1
3.2.1
Ground Girdle
3.3
INSTALLATION OF EQUIPMENT AND ASSEMBLIES
3.3.1
Pad-Mounted Switchgear
3.4
FOUNDATION FOR EQUIPMENT AND ASSEMBLIES
3.5
FIELD QUALITY CONTROL
3.5.1
Acceptance Checks and Tests
3.5.2
Calibration Tests
3.5.3
Follow-Up Verification
-- End of Section Table of Contents --
SECTION 26 13 00.00 25
Page 2
**************************************************************************
USACE / NAVFAC / AFCESA / NASA
UFGS-26 13 00.00 25 (July 2006)
------------------------------Preparing Activity: NAVFAC
Superseding
Southeast
UFGS-S-16345N (March 2001)
Use in lieu of UFGS-26 13 00.00 20
UNIFIED FACILITIES GUIDE SPECIFICATIONS
Use for Southeast projects only
**************************************************************************
SECTION 26 13 00.00 25
PAD-MOUNTED SWITCHGEAR
07/06
**************************************************************************
NOTE: This guide specification covers pad-mounted
switchgear, but it does not cover all possible
methods or requirements for providing pad-mounted
switchgear. To do so would be to produce an
involved, confusing document. This guide
specification presents the usual methods and the
most used alternatives. Different materials and
methods, properly specified, indicated, and
economically used will be acceptable when approved
by cognizant authority.
NOTE: Suggestions for improvement of this
specification will be welcomed using the Navy
"Change Request Forms" subdirectory located in
SPECSINTACT in Jobs or Masters under
"Forms/Documents" directory or DD Form 1426.
Suggestions should be forwarded to:
SECTION 26 13 00.00 25
Page 3
Commanding Officer
Naval Facilities Engineering Command
Southern Division, Code 076
P. O. Box 190010
North Charleston, SC 29419-9010
FAX:
(843) 820-7304
email: SouthDiv@efdlant.navfac.navy.mil
**************************************************************************
**************************************************************************
NOTE: The following information shall be shown on
the project drawings:
1. Where specification identifies type, size,
color, finish, or other definitive information to be
"as indicated," the engineer shall include the
information on the drawings.
2. Location of pad-mounted switchgear, manholes,
ducts, and cables.
3. Types of wire and cable; number and sizes of
conductors.
4. Special conditions.
**************************************************************************
PART 1
1.1
GENERAL
REFERENCES
The publications listed below form a part of this specification to the
extent referenced. The publications are referred to in the text by the
basic designation only.
AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)
ANSI C2
(1997) National Electrical Safety Code
ANSI C57.12.28
(1988; Correction 1988) Switchgear and
Transformers - Pad-Mounted Equipment Enclosure Integrity
ANSI C57.12.29
(1991) Pad-Mounted Equipment - Enclosure
Integrity for Coastal Environments
AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)
ASTM D 2472
(1992; R 1997) Sulfur Hexifloride
INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)
ANSI/IEEE C37.60
(1981; R 1992) Overhead, Pad Mounted, Dry
Vault, and Submersible Automatic Circuit
Reclosers and Fault Interrupters for AC
Systems
SECTION 26 13 00.00 25
Page 4
IEEE 386
(1995) Separable Insulated Connector
Systems for Power Distribution Systems
Above 600 V
INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)
NETA ATS
(1995) Electrical Power Distribution
Equipment and Systems
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)
ANSI/NEMA C37.72
(1987) Manually-Operated, Dead-Front
Padmounted Switchgear with Load
Interrupting Switches and Separable
Connectors for Alternating-Current Systems
NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)
NFPA 70
(1999) National Electrical Code
NFPA 70B
(1998) Electrical Equipment Maintenance
1.2
RELATED REQUIREMENTS
Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS, applies to
this section, with the additions and modifications specified herein.
1.3
SUBMITTALS
Submit the following in accordance with Section 01 33 00 SUBMITTAL
PROCEDURES.
SD-02 Shop Drawings
Pad-mounted switchgear; G
[Calibration schedule]
[Formal request for settings]
SD-03 Product Data
Pad-mounted switchgear; G
Cable connectors; G
[Electronic overcurrent protection; G]
SD-06 Test Reports
Acceptance checks and tests
[Calibration tests]
SD-09 Manufacturer's Field Reports
Pad-mounted switchgear Production and design tests; G
SECTION 26 13 00.00 25
Page 5
Paint qualification tests; G
Test Schedule
SD-10 Operation and Maintenance Data
Pad-mounted switchgear, Data Package 5
Submit Operation and Maintenance Manuals in accordance with
Section 01 78 23 OPERATION AND MAINTENANCE DATA.
1.4
1.4.1
QUALITY ASSURANCE
Pad-Mounted Switchgear
Submit drawings that include, but are not limited to, the following:
a.
Overall dimensions, front view, and sectional views
b.
Ampere ratings
c.
Maximum short-circuit bracing
d.
Interrupting rating
e.
One-line diagram
[f.
Manufacturer's original published time-current curves, not
reproduced copies, (on full size logarithmic paper) of electronic
overcurrent protection to ensure that protection and coordination
are achieved.]
PART 2
2.1
PRODUCTS
PAD-MOUNTED SWITCHGEAR
Provide dead-front switchgear assemblies consisting of manually-operated,
vacuum break, load interrupting, SF6 insulated, switches for pad-mount
applications.
2.1.1
Electrical Ratings and Standards
Design, build, and test switches per ANSI/NEMA C37.72.
assembly rated:
Maximum design voltage, kV
Impulse level (BIL), kV (minimum)
Ac 1-minute withstand, kV (minimum)
Dc 15-minute withstand, kV (minimum)
Continuous current, A
Symmetrical interrupt rating, kA
Momentary current withstand, kA asym
1-second symmetric current withstand, kA
2.1.2
[15.5
95
34
53
600
12
19.2
12]
Provide switch
[27
125
40
78
600
12
19.2
12]
Switchgear Configuration
Provide entrances suitable for cables entering from below.
a.
Number of entrance ways:
[4] [_____] [as indicated]
SECTION 26 13 00.00 25
Page 6
[38
150
50
103
600
12
16
12]
b.
Number of switched ways:
c.
Switch positions:
[d.
2.1.3
[4] [_____] [as indicated]
[CLOSED & OPEN]
Overcurrent protection:
Vacuum Interrupter switches]
Switchgear Enclosure
ANSI/NEMA C37.72 and [ANSI C57.12.28] [ANSI C57.12.29].
**************************************************************************
NOTE: Where corrosion protection equivalent to
stainless steel is needed, specify ANSI C57.12.29.
**************************************************************************
a.
2.1.4
Provide reinforced, tamper resistant, 12-gage steel enclosure.
Switch Construction
Contain switch components and entrances in a factory welded single
stainless steel tank braced to handle momentary and full load current duty.
Factory fill with SF6 gas conforming to ASTM D 2472 before shipment.
Include:
2.1.5
a.
Filling valve
b.
Lifting eyes
c.
Viewing windows to permit inspection of the switch contacts and
nameplate indicating viewed position
d.
Gas pressure gage
e.
Grounding provisions for one12.7 mm 1/2 inch by 13 NC ground
connection per switch-way plus provisions for one 12.7 mm 1/2 inch
by 13 NC tank ground connection
f.
Corrosion resistant tank design using stainless steel and brass
fasteners with no external aluminum parts
g.
One-line diagram and stainless steel nameplate fastened with
stainless steel mechanical fasteners
h.
Compression spring operator
i.
Tank coating:
j.
Operating mechanism capable of being locked in any position, with
position indication and removable operating handle
Manufacturer's standard corrosion protective finish
Bushings
**************************************************************************
NOTE:
Cable Size
|
Bushings
----------------------------------------------less than or equal to
4/0 AWG | 200 Ampere
SECTION 26 13 00.00 25
Page 7
greater than or equal to 250 kCM | 600 Ampere
**************************************************************************
IEEE 386. [Provide 200 Ampere bushing well interfaces and 200 Ampere
load-break inserts.] [and] [Provide 600 Ampere apparatus bushings.]
2.1.6
Switch Operation
Equip each switch-way with an internally-mounted operating mechanism
capable of providing quick-make, quick-break operation in either switching
direction. Provide mechanism capable of delivering sufficient force and
with latches for each position to ensure load interrupting, fault closing,
and momentary ratings. The mechanism shall use compression type springs.
Identify each switch position by an engraved or embossed nameplate.
2.1.7
SF6 Refill Cylinders
**************************************************************************
NOTE: Before including this paragrpah, verify with
the station that refill cylinders are needed.
**************************************************************************
Furnish [two] [_____] 6 pound (minimum) SF6 refill cylinders; and include
regulator, valves, and hose for connection to the fill valve of the switch.
2.1.8
Cable Connectors
**************************************************************************
NOTE:
|Cable
Connectors
Size
| Cable
-----------------------------------------------less than or equal to
4/0 AWG | Load-Break
greater than or equal to 250 kCM | Dead-Break
**************************************************************************
[2.1.8.1
Load-Break Connectors
IEEE 386.
a.
Rated: [95] [_____] kV BIL, [15] [_____] kV Class
b.
Current rating: 200 Amperes RMS continuous, 10000 Amperes RMS,
symmetrical short time for a time duration of 0.17 seconds.
c.
Provide connectors, inserts, and bushings which are the product of
a single manufacturer.
d.
Provide connectors which have a steel reinforced hook-stick eye,
grounding eye, and arc-quenching contact material.
][2.1.8.2
Dead-Break Connectors
IEEE 386.
a.
Rated: [95] [_____] kV BIL, [15] [_____] kV Class
b.
Current rating: 600 Amperes RMS continuous, 10000 Amperes RMS,
symmetrical short time for a time duration of 0.17 seconds.
SECTION 26 13 00.00 25
Page 8
c.
Provide connectors, inserts, and bushings which are the product of
a single manufacturer.
d.
Provide connectors which have a steel reinforced hook-stick eye,
grounding eye, and arc-quenching contact material.
][2.1.9
Electronic Overcurrent Protection
**************************************************************************
NOTE: When overcurrent protection is shown, include
this paragraph and the paragraphs for calibration
and settings.
**************************************************************************
Provide vacuum interrupter switches to accomplish fault current circuit
interruption.
a.
Include electronic control and adjustable trip settings, with an
operating temperature range from -30 to +30 degrees C.
b.
Operation shall not require an external power source.
c.
Trip settings shall emulate "E" and "K" fuses, or relays.
2.1.9.1
Vacuum Interrupter Switches
ANSI/IEEE C37.60.
]2.2
a.
Type:
Vacuum
b.
Design:
c.
Ratings:
3-Phase, group-operated
(1)
Maximum design voltage:
[15.5 kV
[27 kV
(2)
Impulse level (BIL):
95 kV
125 kV
150 kV
(3)
Continuous & loadbreak:
600 Amps
600 Amps
(4)
1 minute withstand AC:
34 kV
40 kV
50 kV
(5)
Symmetrical Interrupting rating:
12 kA
12 kA
12 kA
(6)
Asymmetrical Interrupting rating: 19.2 kA]
19.2 kA]
16 kA]
600 Amps
[38 kV
SOURCE QUALITY CONTROL
Test switchgear as integral assemblies at the switchgear manufacturer's
test facility. A representative of The Southern Division, Naval Facilities
Engineering Command will witness tests. Notify the Government 30 days
before scheduling test date. Ship switchgear only after acceptance of test
results has been received.
2.2.1
Test Schedule
a.
Submit Switchgear Test Schedule for tests to be performed and
required reports.
SECTION 26 13 00.00 25
Page 9
b.
2.2.2
Notify Contracting Officer 15 calendar days in advance of changes
to scheduled dates and location for testing.
Paint Qualification Tests
Submit reports showing that the paint qualification test has been performed
according to [ANSI C57.12.28] [ANSI C57.12.29], to ensure the adequacy of
enclosure finishes to inhibit the buildup of rust.
2.2.3
Load-Break Switches Production and Design Tests
Submit reports which include results of production and design tests
performed according to ANSI/NEMA C37.72. Production tests shall be
performed by the manufacturer on each load-break switch to ensure that
design performance is maintained in production.
[2.2.4
Calibration Schedule
a.
Submit a Calibration Schedule including the anticipated dates when
equipment requiring coordination and protection will be installed,
the anticipated date when the Contractor will submit a formal
request for settings, and the anticipated date when the
manufacturer's technical representative will perform settings and
calibrate equipment.
b.
Submit the Calibration Schedule, via the Contracting Officer to:
SOUTHNAVFACENGCOM, Code 05, Construction Department
SOUTHNAVFACENGCOM, Code 162; Director, Utilities Engineering
Division
][2.2.5
Formal Request for Settings
**************************************************************************
NOTE: The "30" days in brackets below may be
extended for projects involving major electrical
distribution work. Consult with Code 162.
**************************************************************************
a.
Where settings will be provided by the Government to achieve
protection and coordination via relays and protective devices,
submit a formal request for settings [30] days in advance of the
date that settings will be needed, to allow the Contracting
Officer to forward a copy of approved shop drawings to
SOUTHNAVFACENGCOM; Code 162; Director, Utilities Engineering
Division.
b.
The equipment requiring protection and coordination shall have
been installed prior to making this request.
c.
Include approved shop drawings, manufacturer's instructions to set
the protective devices, and manufacturer's time-current curves.
d.
Submit the Formal Request for Settings, via the Contracting
Officer to: SOUTHNAVFACENGCOM; Code 162; Director, Utilities
Engineering Division
SECTION 26 13 00.00 25
Page 10
]2.3
NAMEPLATES AND WARNING SIGNS
Provide as specified in Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS
AND METHODS.
PART 3
3.1
EXECUTION
INSTALLATION
Electrical installations shall conform to ANSI C2, NFPA 70, and to the
requirements specified herein.
3.2
GROUNDING
Provide grounding as indicated, conforming to ANSI C2, NFPA 70, and as
specified in Section 33 71 02.00 20 UNDERGROUND TRANSMISSION AND
DISTRIBUTION.
3.2.1
Ground Girdle
Provide a 1/0 bare copper-ground girdle around pad-mounted switchgear
assemblies. Girdle shall be buried one-foot-deep and placed 3 feet
laterally from the enclosure. Connect girdle to enclosure at two opposite
places using 1/0 copper. Exothermically weld all joints.
3.3
INSTALLATION OF EQUIPMENT AND ASSEMBLIES
Install and connect pad-mounted switchgear [and electronic overcurrent
protection] furnished under this section as indicated on project drawings,
the approved shop drawings, and as specified herein.
3.3.1
Pad-Mounted Switchgear
ANSI/NEMA C37.72.
[3.4
FOUNDATION FOR EQUIPMENT AND ASSEMBLIES
[Provide as specified in Section 26 12 19.10 PAD-MOUNTED TRANSFORMERS.]
[Mount pad-mounted switchgear on concrete slabs. Unless otherwise
indicated, the slab shall be at least 200 mm 8 inches thick, reinforced
with a 150 x 150 mm - D-4 by D-4 6 by 6 - W2.9 by W2.9 mesh placed uniformly
100 mm 4 inches from the top of the slab.
Slab shall be placed on a 150
mm 6 inch thick, well-compacted gravel base. The top of the concrete slab
shall be approximately 100 mm 4 inches above the finished grade. Edges
above grade shall have 15 mm 1/2 inch chamfer. The slab shall be of
adequate size to project at least 200 mm 8 inches beyond the equipment.
Provide conduit turnups and cable entrance space required by the equipment
to be mounted. Seal voids around conduit openings in slab with water- and
oil-resistant calking or sealant. Cut off and bush conduits 75 mm 3 inches
above slab surface. Concrete work shall be as specified in [Section
03 30 00.00 20 CAST-IN-PLACE CONCRETE] [Section 33 71 02.00 20 UNDERGROUND
TRANSMISSION AND DISTRIBUTION.]]
]3.5
3.5.1
FIELD QUALITY CONTROL
Acceptance Checks and Tests
Perform acceptance checks and tests in accordance with the manufacturer's
SECTION 26 13 00.00 25
Page 11
recommendations, NFPA 70B, and NETA ATS, as applicable to switchgear and
referenced ANSI standards. Perform tests specific to switches in
accordance with NETA ATS. [As an exception to NETA ATS requirements,
provide services of manufacturer's technical representative to perform
testing and calibration of protective devices. The Southern Division,
Naval Facilities Engineering Command will witness formal tests after
receipt of written certification that preliminary tests have been completed
and that system is ready for final test and inspection.] Tests shall
include those listed in NETA ATS for the specified equipment and the
following:
[3.5.2
a.
Compare actual connections with wiring diagrams. If differences
are found, determine if error is in diagram or in actual wiring;
correct as necessary.
b.
Inspect devices and equipment for damage or maladjustment caused
by shipment or installation.
c.
Remove wedges, ties, and blocks installed by the manufacturer to
prevent damage during shipment.
Calibration Tests
Submit test result on electronic overcurrent protection via the Contracting
Officer to SOUTHNAVFACENGCOM; Code 162; Director, Utilities Engineering
Division.
]3.5.3
Follow-Up Verification
Upon completion of acceptance checks, settings, and tests, the Contractor
shall show by demonstration in service that circuits and devices are in
good operation condition and properly performing the intended function. As
an exception to requirements stated elsewhere in the contract, notify the
Contracting Officer 10 working days in advance of the dates and times for
checks, settings, and tests to allow the Contracting Officer to notify
SOUTHNAVFACENGCOM Code 0742; Electrical Engineering Division and Code 162;
Director, Utilities Engineering Division.
-- End of Section --
SECTION 26 13 00.00 25
Page 12