USACE / NAVFAC / AFCESA / NASA UFGS-26 05 70.00 40 (November 2008)
-----------------------------------
Preparing Activity: NASA Superseding
UFGS-26 05 73.00 40 (January 2008)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 26 05 70.00 40
HIGH VOLTAGE OVERCURRENT PROTECTIVE DEVICES
11/08
NOTE: This specification covers the requirements for circuit breakers, fuses,
motor controls, and control devices. This section supports Section
26 05.00 40 COMMON WORK RESULTS FOR ELECTRICAL, Section 26 24 16.00 40 PANELBOARDS,
Section 26 24 19.00 40 MOTOR-CONTROL CENTERS, and Section 33 75 00.00 40 HIGH-VOLTAGE
SWITCHGEAR AND PROTECTION DEVICES; accordingly, include it to the extent applicable
to project requirements. Show frame and trip ratings, interrupting ratings,
and NEMA types and sizes, as well as single-line and schematic diagrams, elevations,
and details on drawings.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome. Direct them
to the technical proponent of the specification. A listing of technical proponents
, including their organization designation and telephone number, is on the Internet.
Submit recommended changes to a UFGS as a Criteria Change Request (CCR).
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text are automatically deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
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.
[AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI C39.1(1981; R 1992) Requirements for Electrical Analog Indicating Instruments][ASTM INTERNATIONAL (ASTM)ASTM A 167(1999; R 2004) Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and StripASTM A 48/A 48M(2003; R 2008) Standard Specification for Gray Iron CastingsASTM D 3487(2008) Standard Specification for Mineral Insulating Oil Used in Electrical ApparatusASTM D 877(2002; R 2007) Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes][ELECTRONIC INDUSTRIES ALLIANCE (EIA)EIA 443(1979) Standard for Solid-State Relay Service, EIA/NARM][INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)IEEE C37.09(1999; Corrigendum 2007; Errata 2007) IEEE Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current BasisIEEE C37.121(1989; R 2006) American National Standard for Switchgear Unit Substations RequirementsIEEE C37.13(1990; R 1995) Standard for Low-Voltage AC Power Circuit Breakers Used in EnclosuresIEEE C37.16(2000) Recommendations for Low-Voltage Power Circuit Breakers and AC Power Circuit Protectors, - Preferred Ratings, Related Requirements, and ApplicationIEEE C37.17(1997) Standard for Trip Devices for AC and General-Purpose DC Low-Voltage Power Circuit BreakersIEEE C37.90(2005) Standard for Relays and Relay Systems Associated With Electric Power ApparatusIEEE C57.13(2008) Standard Requirements for Instrument TransformersIEEE C63.2(1996) Standard for Electromagnetic Noise and Field Strength Instrumentation, 10 Hz to 40 GHz - SpecificationsIEEE C63.4(2003) American National Standard for Methods of Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA 107(1998; R 1993) Methods of Measurement of Radio Influence Voltage (RIV) of High-Voltage ApparatusNEMA 250(2003) Enclosures for Electrical Equipment (1000 Volts Maximum)NEMA AB 1(2002) Molded-Case Circuit Breakers, Molded Case Switches, and Circuit-Breaker EnclosuresNEMA AB 3(2001) Molded Case Circuit Breakers and Their ApplicationNEMA C12.1(2008) Electric Meters; Code for Electricity MeteringNEMA C78.23(1995; R 2003) Standard for Incandescent Lamps - Miscellaneous TypesNEMA FU 1(2002; R 2007) Low Voltage Cartridge FusesNEMA ICS 1(2000; R 2005; R 2008) Standard for Industrial Control and Systems General RequirementsNEMA ICS 2(2000; Errata 2002; R 2005; Errata 2006) Standard for Industrial Control and Systems: Controllers, Contractors, and Overload Relays Rated Not More than 2000 Volts AC or 750 Volts DC: Part 8 - Disconnect Devices for Use in Industrial Control EquipmentNEMA ICS 3(2005) Standard for Industrial Control and Systems: Medium Voltage Controllers Rated 2001 to 7200 Volts ACNEMA ICS 6(1993; R 2006) Standard for Industrial Controls and Systems EnclosuresNEMA SG 2(1993) Standard for High-Voltage Fuses][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition][UNDERWRITERS LABORATORIES (UL)UL 489(2002; Rev thru Jun 2006) Standard for Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker EnclosuresUL 50(2007) Standard for Enclosures for Electrical EquipmentUL 508(1999; Rev thru Sep 2008) Standard for Industrial Control Equipment]1.2 SUBMITTALS
NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Keep submittals to the minimum required for adequate quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, use a code of
up to three characters within the submittal tags following the "G" designation
to indicate the approving authority. Codes for Army projects using the Resident
Management System (RMS) are: "AE" for Architect-Engineer; "DO" for District
Office (Engineering Division or other organization in the District Office);
"AO" for Area Office; "RO" for Resident Office; and "PO" for Project Office.
Codes following the "G" typically are not used for Navy, Air Force, and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that reviews the submittal for the Government.] Submit the following in
accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-01 Preconstruction Submittals
Prior to the beginning of construction submit manufacturer's equipment and performance data
for the following items including use life, system functional flows, safety features, and mechanical
automated details.
Fuses
SD-02 Shop Drawings
Submit Connection Diagrams and Fabrication Drawings for the following items in accordance with
paragraph entitled, "General Requirements," of this section.
Submit Installation drawings for the following items in accordance with the paragraph entitled,
"Installation," of this section.
Control Devices
Protective Devices
SD-03 Product Data
Submit manufacturer's equipment and performance data for the following items including use life,
system functional flows, safety features, and mechanical automated details.
Motor Control
Instrument Transformers
Enclosures
Circuit Breakers
Control Devices
Protective Relays
Indicating Instruments
Indicating Lights
SD-06 Test Reports
Submit Factory Test Reports for Power, High Voltage, and Oil Circuit Breakers in accordance
with IEEE C37.09.
Dielectric Tests
Timing Test
Insulation Power Factor Test
SD-07 Certificates
Submit certificates for Circuit Tests on similar motor-control or submit motor-circuit protector
(MCP) units under actual conditions in lieu of factory tests on the actual units provided.
SD-08 Manufacturer's Instructions
Submit manufacturer's instructions for the following items, including special provisions required
to install equipment components and system packages. Provide detail on resistance impedances,
hazards and safety precautions within the special notices.
Control Devices
Protective Devices
SD-10 Operation and Maintenance Data
Submit Operation and Maintenance Manuals for the following equipment:
Manual Motor Controllers
Magnetic Motor Controllers
High Voltage Motor Controllers
Circuit Breakers
Protective Relays
Indicating Instruments
1.3 GENERAL REQUIREMENTS
NOTE: If Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS is not
included in the project specification, insert applicable requirements and delete
the following paragraph.
Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS applies to work specified in this section.
Submit Connection Diagrams showing the relations and connections of control devices and protective devices by
showing the general physical layout of all controls, the interconnection of one system (or portion of system)
with another, and internal tubing, wiring, and other devices.
Submit Fabrication Drawings for control devices and protective devices consisting of fabrication and assembly
details to be performed in the factory.
PART 2 PRODUCTS
2.1 MOTOR CONTROL
Conform to NEMA ICS 3, and UL 508 for motor controllers. Provide controllers that have thermal overload protection
in each phase.
2.1.1 Manual Motor Controllers
Provide full-voltage, manually operated manual motor controllers for the control and protection of single-phase
60-hertz ac small wattage rating fractional-horsepower squirrel-cage induction motors.
Provide single-throw, single- or double-pole, three-position controllers rated at not more than 750 watt rated
1 horsepower at 115- and 230-volts single phase. Include a supporting base or body of electrical insulating
material with enclosed switching mechanism, yoke, thermal overload relay, and terminal connectors. Provide controllers
that clearly indicate operating condition: on, off, or tripped.
Provide toggle- or key-operated type manual motor controllers as indicated and arrange so that they are lockable
with a padlock in the "OFF" position.
Provide recessed manual motor controllers for single-speed, small wattage rating fractional-horsepower squirrel-cage
induction motors that include a single controller and indicating light in a 100 millimeter 4-inch square wall
outlet box for flush-wiring devices with matching corrosion-resistant steel flush cover plate. Provide surface-mounted
manual motor controllers for single-speed, small wattage rating fractional-horsepower squirrel cage induction
motors that include a single controller and indicating light in a NEMA 250, Type [1] [_____] general-purpose
enclosure.
Provide recessed and surface-mounted manual motor controllers for two-speed, small wattage rating fractional-horsepower
squirrel-cage induction motors that include two controllers, two indicating lights, and a selector switch in
a multiple-gang wall outlet box for flush-wiring devices with matching corrosion-resistant steel flush-cover
plate. Provide surface-mounted manual motor controllers for two-speed small wattage rating fractional-horsepower
squirrel-cage induction motors that include two controllers, two indicating lights, and a selector switch in
a NEMA 250, Type [1] [_____] general-purpose enclosure.
2.1.2 Magnetic Motor Controllers
[2.1.2.1 Full-Voltage Controllers
Provide magnetic motor controllers for the control and protection of single- and three-phase, 60-hertz, squirrel-cage
induction motors with full-voltage, full magnetic devices in accordance with NEMA ICS 1, NEMA ICS 2, and UL 508
.
Provide a coil assembly which operates satisfactorily between 85 and 110 percent of rated coil voltage, with
120 volts, 60 hertz motor control circuits, and with two normally open and two normally closed auxiliary contacts
rated per NEMA ICS 1 and NEMA ICS 2 in addition to the sealing-in contact for control circuits. Include solderless
pressure wire terminal connectors for line-and load connections to controllers.
Overcurrent protection includes three manual reset thermal overload devices, one in each pole of the controller.
Provide thermal overload relays of the [melting-alloy] [bimetallic nonadjustable] type with continuous current
ratings and service-limit current ratings and with a plus or minus 15 percent adjustment to compensate for ambient
operating conditions.
Provide an externally operable manual-reset button to re-establish control power to the holding coil of the electromagnet.
After the controller has tripped from overload, resetting the motor-overload device will not restart the motor.
Provide enclosure conforming to NEMA 250, Type [_____].
]2.1.3 High-Voltage Motor Controllers
Provide high-voltage motor controllers for the control and protection of squirrel-cage induction motors, wound-rotor
induction motors, and synchronous machines rated 2.4 through 7.2 kilovolts, three-phase, that are NEMA ICS 2,
Class E2, type as required.
Unless enclosed within a switchgear or unit-substation cubicle, house high-voltage motor controllers in floor-mounted
structures of the NEMA type indicated, approximately 2300 millimeter 90 inches high, 750 millimeter 30 inches
wide, and 750 millimeter 30 inches deep, with suitable draw-out compartments. Include structural provisions
for padlocking the doors.
Subdivide structure into low-voltage control compartment with separate door, high-voltage control compartment
with separate door, ac bus compartment, and cable-entrance compartment.
Isolate controller by externally operated draw-out stabs with shutter mechanism which also opens the secondary
of the control-power transformer. Provide interlocks to prevent inadvertent operation of the isolating mechanism
under load, opening the medium-voltage compartment door without isolating the starter, and closing the line contactor
with door open. Include an isolating switch assembly.
For overload protection, include ambient-compensated thermal overload relays and hand reset in all three phases.
Utilizing solid-state multifunction overload protection is acceptable when approved.
Provide fused type controllers employing current-limiting power fuses of the interrupting rating indicated.
Provide single-phase antitrip protection. On starters, employ magnetic air-break line contactors rated not less
than 5 kilovolts. Provide control circuit with provisions for external testing of 120-volt control circuit and
a minimum of one set of normally open and normally closed auxiliary contacts.
2.2 INSTRUMENT TRANSFORMERS
Comply with the interference requirements listed below, measured in accordance with IEEE C63.2, IEEE C63.4, and
NEMA 107 for Instrument transformers.
Preferred Radio Influence
Basic Nominal Test Voltage Test Voltage Voltage Level,
Insulation Insulation System for Potential for Current Microvolts
Class, Level, Voltage, Transformers, Transformers, Dry Oil
kV kV kV kV kV Type Filled
__________________________________________________________________________
0.6 10 ........ ............ 0.76 250 250
1.2 30 0.208 0.132 0.76 250 250
0.416 0.264
0.832 0.528
1.04 0.66
2.5 45 2.40 1.52 1.67 250 250
5.0 60 4.16 2.64 3.34 250 250
4.80 3.04
8.7 75 7.20 4.57 5.77 250 250
8.32 5.28
15L or 15H 95-110 12.00 7.62 9.41 1000 250
12.47 7.92
14.40 9.14
25 150 23.00 14.60 15.70 2500 650
34.5 200 34.50 21.90 23.0 .... 650
46 250 46.00 29.20 29.30 .... 1250
69 350 69.00 43.80 44.00 .... 1250
92 450 92.00 58.40 58.40 .... 2500
115 550 115.00 73.40 73.40 .... 2500
138 650 138.00 88.00 88.00 .... 2500
2.2.1 Current Transformers
Provide current transformers that conform to IEEE C57.13 for installation in metal-clad switchgear. Use standard
3-A secondary transformer.
Provide [wound] [bushing] [bar] [window] type transformers.
Provide transformers that have [single] [double] secondary winding.
Provide transformers that are complete with secondary short-circuiting device.
For window-type current transformers, provide indoor dry type construction with secondary current ratings as
indicated with specified burden, frequency, and accuracy.
2.2.2 Potential Transformers
For potential transformers, conform to IEEE C57.13 for installation in metal-clad switchgear. Use standard 120-volt
secondary transformers.
Provide transformers that have [single] [tapped] [double] secondary.
Provide burden, frequency, and accuracy as required.
For disconnecting potential transformers with integral fuse mountings and current-limiting fuses provide indoor
dry type two-winding construction with primary and secondary voltage ratings as required.
2.3 ENCLOSURES
2.3.1 Equipment Enclosures
Provide enclosures for equipment in accordance with NEMA 250.
[Contain equipment installed inside clean, dry locations in a NEMA Type 1, general-purpose sheet-steel enclosure.]
[Contain equipment installed in wet locations in NEMA Type 4 watertight, corrosion-resistant sheet-steel enclosure,
constructed to prevent entrance of water when tested in accordance with NEMA ICS 6 for Type 4 enclosures.]
[Contain equipment installed in industrial locations in a NEMA Type 12 industrial use, sheet-steel enclosure
constructed to prevent the entrance of dust, lint, fibers, flyings, oil, and coolant seepage.]
[Contain equipment installed in Class I, Division I, Group A, B, C, and D, hazardous locations in NEMA Type 7
enclosures approved for the specific flammable gas or vapor that is possibly present under normal operating conditions.]
[Contain equipment installed in Class II, Division I, Group E, F and G, hazardous locations in NEMA Type 9 enclosures
approved for use where combustible dust is possibly present under normal operating conditions.]
[Fabricate sheet-steel enclosures from uncoated carbon-steel sheets of commercial quality, with box dimensions
and thickness of sheet steel in accordance with UL 50.]
[Fabricate steel enclosures from corrosion-resistant, chromium-nickel steel sheet conforming to ASTM A 167 Type
300 series with ASM No. 4 general-purpose polished finish, with box dimensions and thickness of sheet steel in
accordance with UL 50.]
[Provide cast-iron enclosures from gray-iron castings conforming to ASTM A 48/A 48M with tensile-strength classification
recognized as suitable for the application. Provide cast metal enclosures that area not less than 3 millimeter
1/8-inch thick at every point, of greater thickness at reinforcing ribs and door edges, and not less than 6
millimeter 1/4-inch thick at tapped holes for conduits.]
2.3.2 Remote-Control Station Enclosures
Provide remote-control station enclosures for pushbuttons, selector switches, and indicating lights in accordance
with the appropriate articles of NEMA ICS 6 and NEMA 250.
[Contain remote-control stations installed in indoor, clean, dry locations in NEMA Type 1 general-purpose, sheet-steel
enclosures. Contain recessed remote-control stations in standard wall outlet boxes with matching corrosion-resistant
steel flush cover plate.]
[Contain remote-control stations installed in wet locations in NEMA Type 4 watertight, corrosion-resistant sheet-steel
enclosures constructed to prevent entrance of water when tested in accordance with NEMA ICS 6 and NEMA 250 for
Type 4 enclosures.]
[Contain remote-control stations installed in wet locations in NEMA Type 4 watertight, cast-iron enclosures constructed
to prevent entrance of water when tested in accordance with NEMA ICS 6 and NEMA 250 for Type 4 enclosures.]
[Contain remote-control stations installed in dry noncombustible dust-laden atmospheres in NEMA Type 12 dusttight,
cast-iron enclosures with gaskets or their equivalent to prevent the entrance of dust.]
[Contain remote-control stations installed in industrial locations in NEMA Type 12 industrial-use, sheet-steel
enclosures constructed to prevent the entrance of dust, lint, fibers, flyings, oil, and coolant seepage.]
[Contain remote-control stations installed in industrial locations in NEMA Type 12 industrial-use, cast-iron
enclosures constructed to prevent the entrance of dust, lint, fibers, flyings, oil, and coolant seepage.]
[Contain remote-control stations installed in Class I, Division I, Group A, B, C, and D, hazardous locations
in NEMA Type 7 enclosures approved for the specific flammable gas or vapor which is possibly present under normal
operating conditions.]
[Contain remote-control stations installed in Class II, Division I, Group E, F and G, hazardous locations in
NEMA Type 9 enclosures approved for use where combustible dust is possibly present under normal operating conditions.]
[Fabricate sheet-steel enclosures from uncoated carbon-steel sheets of commercial quality with box dimensions
and thickness of sheet steel in accordance with UL 50.]
[Fabricate steel enclosures from corrosion-resistant, chromium-nickel steel sheet conforming to ASTM A 167, Type
300 series with ASM No. 4 general-purpose polished finish, with box dimensions and thickness of sheet steel in
accordance with UL 50.]
[Provide cast-iron enclosures of gray-iron castings conforming to ASTM A 48/A 48M, with tensile-strength classification
recognized as suitable for this application. Provide cast metal enclosures that are not less than 3 millimeter
1/8-inch thick at every point, of greater thickness at reinforcing ribs and door edges not less than 6 millimeter
1/4 inch thick at tapped holes for conduit.]
Install remote-control stations with the centerline 1700 millimeter 66 inches above the finished floor.
2.4 CIRCUIT BREAKERS
Provide circuit breakers that conform to UL 489, NEMA AB 1, and NEMA AB 3.
2.4.1 Power Circuit Breakers
NOTE: Specify when or where to install breakers equipped with current-limiting
fuses and requirements for coordination with other system protective devices.
Edit breaker description to suit project requirements.
Provide air-break type power circuit breakers enclosed in ventilated housings for those rated below 600 volts
with current, voltage, and interrupting ratings as required.
Comply with IEEE C37.16 and IEEE C37.13 for power circuit breakers.
Equip power circuit breakers with [electromechanical] [static trip (solid-state)] devices with [long-time/short-time]
[instantaneous] elements.Provide breakers that are electrically and mechanically trip-free in any position of
the closing stroke. Include ground fault protection in either type trip device. Provide silver-plated main
contacts and sintered tungsten alloy arcing contacts. Accomplish tripping by a [shunt-trip] [series-trip] device.
Provide [manual] [electrical] closing operation.
Provide drawout type breakers where installed in metal housings such as unit substations. For breakers installed
in isolated locations or not as units of a central distribution center, provide [switchboard] [wall] -mounted,
with a correctly ventilated protective metal cover.
Supply alarms, auxiliary switches, interlocks, and similar devices as required.
Provide breakers with a removable operating handle, provision for padlocking, and position indicator.
Factory test Power Circuit Breakers in accordance with IEEE C37.09.
2.4.2 Air Circuit Breakers
Provide circuit breakers that include a ground-fault system or ground-sensing relays.
2.4.2.1 Stored-Energy-Operated Type
For air circuit breakers with stored-energy-operated mechanisms, conform to IEEE C37.121 for metal-clad switchgear
rated above [600 volts] [5 kilovolts], [14.4 kilovolts] [grounded] [ungrounded].
Mount metal-clad air circuit breakers on a mobile frame with primary and secondary disconnecting devices, automatic
shutters, and mechanical interlocks to allow complete removal of the unit for inspection and maintenance. Provide
three-pole, single-throw, electrically operated circuit breakers, with a motor-charged spring, stored-energy
mechanism, and electric release coils for tripping and closing operations.
Provide a motor-operated position-changing mechanism that moves the breaker between the test and operating position
by means of a levering device. Provide interlocks to prevent the complete withdrawal of the circuit breaker
from its compartment when the stored-energy mechanism is in the fully charged position. Design circuit breakers
to prevent the release of stored energy unless the mechanism is fully charged.
Provide circuit breakers that have mechanically trip-free mechanisms with direct-current potential trip coils
of the voltage indicated, auxiliary switches, latch-checking switches, control relays, and operation counters.
2.4.2.2 Solenoid-Operated Type
Conform to IEEE C37.121 for air circuit breakers with solenoid-operated mechanisms and the appropriate articles
for metal-clad switchgear rated above [600 volts] [5 kilovolts] [14.4 kilovolts].
Mount metal-clad air circuit breakers on a mobile frame with primary and secondary disconnecting devices, automatic
shutters, and mechanical interlocks to allow complete removal of the unit for inspection and maintenance. Provide
three-pole single-throw circuit breakers, with solenoid-operated tripping/closing mechanism designed for operation
on a direct-current station battery power supply or direct from an emergency ac power system of [_____] voltage.
Rate mechanism closing coils for 125 volts and operable at voltages as low as 90 volts. Rate mechanism trip
coils for 125 volts and operable at voltages as low as 70 volts. Provide operating mechanism for ac control
circuits by the manufacturer for [_____] voltage.
Provide circuit breakers with mechanically trip-free mechanisms including auxiliary switches, latch-checking
switches, control relays, and operation counters. The use of solid-state tripping devices is acceptable.
2.4.3 Oil Circuit Breakers
For oil circuit breakers, use control voltage as indicated with a tripping mechanism consisting of a magnet acting
as a trigger to release a latch, permitting the breaker to open. Provide a pneumatic operating system with compressors
and reservoirs as needed. Integrate tripping/closing control with the breakers.
Provide three phase distribution-voltage breakers with all three interrupters mounted in the same tank. Provide
transmission-voltage oil circuit breakers with the phase interrupters mounted in separate tanks.
Equip circuit-breaker bushings with bushing current transformers and standard secondary taps. Provide taps that
are terminated outside the tank housing on terminal blocks and identified for short circuiting.
Enclose operating mechanism in a waterproof housing mounted on the breaker framework with heaters to prevent
condensation of moisture. Provide a mechanically trip-free breaker mechanism.
Equip each breaker with complete relaying and controls. Provide relaying consisting of instantaneous and overcurrent
time-delay relays plus others as indicated and controls consisting of a reclosing relay, control switch, indicating
lights, ammeters, and as approved. Install relays and controls in a control cabinet mounted on the breaker housing
(solid-state type is acceptable) or install remotely. Provide an externally operable manual trip device.
Supply each oil circuit breaker with tank-lowering and tank-lifting devices. Where applicable, provide a tank
drain valve and an oil level indicator on each tank.
Conform to ASTM D 3487 for oil used in the oil circuit breakers.
Factory test oil circuit breakers in accordance with IEEE C37.09
2.5 FUSES
Provide a complete set of fuses for all switches and switchgear. Provide fuses that have a voltage rating of
not less than the circuit voltage.
Make no change in continuous-current rating, interrupting rating, and clearing or melting time of fuses unless
written permission has first been secured.
Provide nonrenewable cartridge type fuses for ratings 30 amperes, 125 volts or less. Provide renewable cartridge
type fuses for ratings above 30 amperes 600 volts or less with time-delay dual elements, except where otherwise
indicated. Conform to NEMA FU 1 for fuses.
Install special fuses such as extra-high interrupting-capacity fuses, fuses for welding machines, and capacitor
fuses where required. Plug fuses are not permitted.
Provide power fuses on ac systems above 600 volts in accordance with NEMA SG 2.
Label fuses showing UL class, interrupting rating, and time-delay characteristics, when applicable. Additionally,
clearly list fuse information on equipment drawings.
Provide porcelain fuse holders when field-mounted in a cabinet or box. Do not use fuse holders made of such
materials as ebony asbestos, Bakelite, or pressed fiber for field installation.
2.6 PROTECTIVE RELAYS
2.6.1 Overcurrent Relays
Conform to IEEE C37.90 for overcurrent relays.
For protection against phase and ground faults provide single-phase nondirectional removable induction type overcurrent
relays with built-in testing facilities designed for operation on the dc or ac control circuit indicated.
Provide ground-fault overcurrent relays with short-time inverse time characteristics with adjustable current
tap range as required.
Provide phase-fault overcurrent relays with varied inverse-time characteristics with adjustable current tap range
as required and indicating instantaneous-trip attachments with adjustable current range as required.
Semiflush-mount case with matching cover to the hinged instrument panel.
Provide solid-state static-type trips for low-voltage power circuit breakers in accordance with EIA 443 and IEEE C37.17
.
Provide a trip unit that employs a combination of discreet components and integrated circuits to provide the
time-current protection functions required in a modern selectively coordinated distribution system.
Provide complete system selective coordination by utilizing a combination of the following time-current curve-shaping
adjustments: ampere setting; long-time delay; short-time pickup; short-time delay; instantaneous pickup; and
ground fault.
Provide switchable or easily defeatable instantaneous and ground fault trips.
Make all adjustments using non-removable, discrete step, highly reliable switching plugs for precise settings.
Provide a sealable, transparent cover over the adjustments to prevent tampering.
Furnish trip devices with three visual indicators to denote the automatic tripping mode of the breaker including:
overload; short circuit; and ground fault.
Wire trip unit to appropriate terminals whereby an optional remote automatic trip accessory can be utilized to
provide the same indication.
Make available for use a series of optional automatic trip relays for use with the trip unit to provide remote
alarm and lockout circuits.
Provide all trip units with test jacks for in-service functional testing of the long-time instantaneous and ground
fault circuits using a small hand-held test kit.
2.6.2 Directional Overcurrent Relays
Provide directional overcurrent relays in accordance with IEEE C37.90.
For directional overcurrent relays for protection against reverse-power faults provide single-phase induction
type with adjustable time-delay and instantaneous trip attachments. Provide removable type relays with inverse-time
directional and overcurrent units with built-in testing facilities.
Semiflush-mount case with matching cover to the hinged instrument panel.
2.6.3 Reclosing Relays
For reclosing relays, conform to IEEE C37.90.
Design reclosing relays to reclose circuit breakers that have tripped from overcurrent. Provide device that
automatically recloses the breaker at adjustable time intervals between reclosures and then locks out the breaker
in the open position if the fault persists. Provide circuit breaker that remains closed and the reclosing relay
resets automatically and is ready to start a new sequence of operation if the fault disappears after any reclosure.
Provide removable reclosing relays with built-in testing facilities and consisting of a timing unit rated at
120/240 volts, single-phase, ac and solenoid and contactor units with dc rating as indicated. Arrange contacts
for one instantaneous reclosure and two subsequent reclosures at 15 and 45 seconds, respectively. Set time dial
for 60-second drum speed.
Semiflush-mount case with matching cover to the hinged instrument panel.
2.6.4 Undervoltage Relays
For undervoltage relays, conform to IEEE C37.90.
Provide three-phase induction type undervoltage relays including inverse timing with adjustable high- and low-voltage
contacts and calibrated scale for protection against loss of voltage, undervoltage, and overvoltage. Equip relays
with indicating contactor and voltage switches to provide electrically separate contact circuits. Provide relays
that are removable with built-in testing facilities and that are suitable for operation on 120-volt ac circuits
with contacts that are suitable for operation on dc or ac control circuits.
Semi-flush mount case with matching cover to the hinged instrument panel.
2.7 INDICATING INSTRUMENTS
2.7.1 Ammeters
For ammeters, conform to ANSI C39.1.
Provide switchboard indicating ammeters of approximately 115 millimeter 4-1/2 inches square with 250-degree scale
and recessed cases suitable for flush mounting. Furnish white dials with black figures and black pointers.
Mount instruments on the hinged front panel of the switchgear compartment completely isolated from high-voltage
circuits. Provide standard 5-ampere type meter for a zero to full-scale normal movement, 60 hertz.
2.7.2 Voltmeters
For voltmeters, conform to ANSI C39.1.
Provide a switchboard indicating voltmeters that is approximately 115 millimeter 4-1/2-inches square with 250-degree
scale and recessed cases suitable for flush mounting. Furnish white dials with black figures and black pointers.
Mount instruments on the hinged front panel of the switchgear compartment completely isolated from high-voltage
circuits. Provide standard 120-volt type voltmeter for a zero to full-scale normal movement, 60 hertz.
2.7.3 Watt-Hour Meters/Wattmeters
For watt-hour meters, wattmeters, and pulse initiation meters conform to NEMA C12.1.
Provide three-phase induction type switchboard wattmeters for use with instrument transformers with two stators,
each equipped with a current and potential coil. Provide meter that is rated for 5 amperes at 120 volts and
is suitable for connection to three-phase, 3- and 4-wire circuits. Provide instrument complete with potential
indicating lamps, light-load and full-load adjustments, phase balance, power-factor adjustments, four-dial clock
register, ratchets to prevent reverse rotation, and built-in testing facilities.
Provide pulse initiating meters for use with demand meters or pulse recorders that are suitable for use with
mechanical or electrical pulse initiators. Provide mechanical load imposed on the meter by the pulse initiator
that is within the limits of the pulse meter. Provide load as constant as practical throughout the entire cycle
of operation to ensure accurate meter readings. Provide pulse initiating meter that is capable of measuring
the maximum number of pulses at which the pulse device is nominally rated. Consider pulse initiating meter to
be operating properly when a kilowatt hour check indicates that the demand meter kilowatthours are within limits
of the watthour meter kilowatthours.
Locate pulse initiating meters such that components sensitive to moisture and temperature conditions are minimized.
Take precautions to protect sensitive electronic metering circuitry from electromagnetic and electrostatic induction.
Furnish removable meters with draw out test plug and furnish contact devices to operate remote impulse-totalizing
graphic demand meters.
Semi-flush mount case with matching cover to the hinged instrument panel.
2.7.4 Graphic Demand Meters
For impulse-totalizing graphic demand meters conform to NEMA C12.1.
Provide impulse-totaling graphic demand meters that are suitable for use with switchboard watt-hour meters and
that include a two-circuit totalizing relay, cyclometer for cumulative record of impulses, four-dial totalizing
kilowatt-hour register, synchronous motor for timing mechanism, torque motor, and chart drive. Provide a positive
chart-drive mechanism consisting of chart spindles and drive sprockets that maintains the correct chart speed
for roll strip charts. Provide instrument that records as well as indicates on clearly legible graph paper the
15-minute integrated kilowatt demand of the totalized system.
Furnish the motive power for advancing the register and pen-movement mechanism with a torque motor. Provide
capillary pen containing a 1-month ink supply. Provide a 31-day continuous record of operation roll charts.
Semi-flush mount case with matching cover to the hinged instrument panel.
2.7.5 Specialty-Type Meters
For specialty meters conform to ANSI C39.1. Specialty-type meters are panel meters applicable to specific situations,
such as pyrometers and dc parameter meters that conform to the panel layout specified. Provide meter scales
that are not less than 180 degrees. Do not use edgewise meters for circuit current and voltage measurements.
2.8 FACTORY TESTING
Perform factory tests on control and low voltage protective devices in accordance with the manufacturer's recommendations.
Conduct short-circuit tests in accordance with Section 2 of NEMA ICS 1.
Perform factory tests on power, high-voltage, and oil circuit breakers in accordance with IEEE C37.09.
2.9 INDICATING LIGHTS
2.9.1 General-Purpose Type
For indicating lights, provide oiltight instrument devices with threaded base and collar for flush-mounting,
translucent convex lens, candelabra screw-base lampholder, and 120-volt, 6-watt, Type S-6 incandescent lamp in
accordance with NEMA C78.23. Provide indicating lights color coded in accordance with NEMA ICS 6.
Provide indicating lights in remote-control stations when pushbuttons and selector switches are out of sight
of the controller.
2.9.2 Switchboard Indicating Lights
For switchboard indicating lights, provide the manufacturer's standard transformer type units [120-volt input]
[_____] utilizing low-voltage lamps and convex lenses of the colors indicated. Provide indicating lights that
are capable of being relamped from the switchboard front. Indicating lights utilizing resistors in series with
the lamps are not permitted, except in direct-current control circuits. Provide lights that have a press-to-test
feature.
2.10 FINISH
NOTE: For all outdoor applications and all indoor applications in a harsh environment
refer to Section 09 96 00 HIGH-PERFORMANCE COATINGS. High performance coatings
are specified for all outdoor applications because ultraviolet radiation breaks
down most standard coatings, causing a phenomena known as chalking, which is
the first stage of the corrosion process. For additional information contact
The Coatings Industry Alliance, specific suppliers such as Keeler and Long and
PPG, and NACE International (NACE).
Protect metallic materials against corrosion. Provide equipment with the standard finish by the manufacturer
when used for most indoor installations. For harsh indoor environments (any area subjected to chemical and/or
abrasive action), and all outdoor installations, refer to Section 09 96 00 HIGH-PERFORMANCE COATINGS.
PART 3 EXECUTION
3.1 INSTALLATION
Install Control devices and protective devices that are not factory installed in equipment in accordance with
the manufacturer's recommendations and field adjusted and operation tested. Conform to NFPA 70, NEMA ICS 1,
NEMA ICS 2, and NEMA ICS 3 requirements for installation of control and protective devices.
3.2 FIELD TESTING
Demonstrate to operate as indicated control and protective devices not factory installed in equipment.
Ratio and verify tap settings of instrumentation, potential, and current transformers.
Give circuit breakers rated 15KV and above a timing test to verify proper contact speed, travel, bounce, and
wipe.
Give oil and high-voltage circuit breakers and their bushings an insulation power factor test to establish condition
monitoring baselines.
Perform dielectric tests on insulating oil in oil circuit breakers before the breakers are energized. Test oil
in accordance with ASTM D 877, and provide breakdown voltage that is not less than 25,000 volts. Provide manufacturer
certification that the oil contains no PCB's and affix a label to that effect on each breaker tank and on each
oil drum containing the insulating oil.
Field adjust reduced-voltage starting devices to obtain optimum operating conditions. Provide test meters and
instrument transformers that conform to NEMA C12.1 and IEEE C57.13.
Do not energize control and protective devices until recorded test data has been approved. Provide final test
reports with a cover letter/sheet clearly marked with the System name, Date, and the words "Final Test Reports
- Forward to the Systems Engineer/Condition Monitoring Office/Predictive Testing Group for inclusion in the Maintenance
Database."