Specification Number: 16340-2.2
Product Name: COMPACT COMPARTMENTALIZED MEDIUM VOLTAGE METAL-ENCLOSED LOAD INTERRUPTER SWITCHGEAR
SECTION 16340-2.2
COMPACT COMPARTMENTALIZED MEDIUM VOLTAGE 
METAL-ENCLOSED LOAD INTERRUPTER SWITCHGEAR
*************************************************************************************
This specification is written for 5.5 kV through  38kV free-standing or close-coupled metal-enclosed switchgear.
NOTE:    The most economical and compact equipment will be achieved by grouping all top entry or exit switches together and all bottom entry or exit switches together in a lineup.
*************************************************************************************
PART 1 GENERAL
1.01 SECTION INCLUDES
A.	Medium voltage compact compartmentalized metal-enclosed switchgear with load interrupter switches.
1.02 REFERENCES
A.	ANSI / IEEE C37.20.3 (19__)- Standard for Metal-Enclosed Interrupter Switchgear.
B.	ANSI / IEEE C37.20.4 (19__)- Standard for Indoor AC Medium-Voltage Switches used in Metal-Enclosed Switchgear.
C.	ANSI / IEEE 24(19__) - Standard Performance Characteristics and Dimensions for Outdoor Apparatus Bushings.
D.	ANSI / IEEE 48 (19__)- Standard Test Procedures and Requirements for High-Voltage Alternating-Current Cable Termination.
E.	ANSI Z55.1(19__) - Gray Finishes for Industrial Apparatus and Equipment.
F.	NEMA 
G.	IEC 420 High-Voltage Alternating Current Switch-Fuse Combinations (Applicable sections to ensure proper coordination of the switch-fuse combination when fuses are utilized for opening the switch automatically) Test Duties 4 and 5.
H.	CAN/CSA C22.2 No. 31 Switchgear Assemblies.
I.	CAN/CSA C22.2 No. 193 High Voltage Full-Load Interrupter Switches.
1.03 SUBMITTALS
A.	The metal-enclosed switchgear assembly shall be in accordance with the contract documents, applicable codes and whichever is the most stringent.
B.	The manufacturer shall furnish a detailed Bill of Material and complete set of drawings including:
1.	Detailed front elevation.
2.	Single Line
3.	Floor Plan
4.	Schematics
5.	Wiring Diagrams
C.	The manufacturer shall furnish comprehensive instruction manuals covering the installation of the switchgear and the operation of it's various components.
1.04 QUALITY ASSURANCE
A.	In accordance with (customer to specify section)
B.	Manufacturer:  Company specializing in medium voltage metal-enclosed switchgear with at least five years documented experience.  The manufacturer of the switchgear must be the same as the manufacturer of the load interrupter switch.
C.	Equipment shall be UL [cUL] listed and labeled for metal-enclosed type switchgear assemblies.
1.05 DELIVERY, STORAGE, AND HANDLING 
A.	Deliver products to site under provisions of section 01650.
B.	Store and protect products under provisions of Section 01660.
C.	Accept equipment on site and inspect for shipping damage.
D.	Protect equipment from weather and moisture by covering with heavy plastic or canvas and by maintaining heat within enclosure in accordance with manufacturer's instructions.

PART 2 PRODUCT
2.01 MANUFACTURERS 
A.	Switchgear:  The metal-enclosed load interrupter switchgear shall be Square D type HVL/CC or approved equal. Submit shop drawings under the provisions of Section 01330.
B.	Current limiting fuses shall be Square D din style type or equal for [5.5 kV] [15.5kV][17.5 kV] [25.8kV] [38kV]voltage class (note: fuse size on one-line diagram). Fuses shall have a 65,000 amperes symmetrical interrupting capability at [5 kV] [15.5kV] [17.5kV] or 25,000 amperes symmetrical interrupting capability at [25.8kV] [38kV].
C.	The switchgear shall be equipped with an optional FUSELOGIC system to provide the following features:
*************************************************************************
Select the appropriate FUSELOGIC description and/or features
*************************************************************************
1.	Provide direct acting, single phase protection ([5.5 kV up to 175E] [15.5 kV up to 125E] [25.8kV up to 65E] [38kV up to 50E]) using Square D din style fuses (or equal) to automatically open the stored energy (see section 2.03 B) operated load interrupter switch when a fuse blows.  For fuses at [5.5kV and greater than 175E] [15.5kV greater than 125E] [25.8kV and greater than 65E] [38kV and greater than 50E] single phasing protection shall be supplied by shunt trip operation directly driven from blown fuse contact (see section 2.02 E for governing standard). The system shall further prevent potential single phasing conditions by blocking the closing of the switch when a fuse is blown or if a fuse is not installed.
2.	Provide a system to prevent potential single phase conditions by blocking the closing of a [manually] [motor] operated load interrupter switch when a fuse is blown or not installed.
3.	Fuses shall be Square D din style (or equal) non-disconnect mounted fuses with provisions for removal and replacement from the front of the switchgear.
2.02 LOAD INTERRUPTER SWITCHGEAR ASSEMBLY
A.	The metal-enclosed switchgear assembly shall be compartmentalized into the following distinct compartments:
1.	Main bus compartment
2.	Switch Compartment
3.	Cable connection / fuse compartment
4.	Mechanism compartment
5.	[{Optional} Low voltage / control compartment.]
B.	The metal-enclosed switchgear with load interrupter switches shall consist of a [single section] [multiple section line-up] [close coupled connection with the transformer], be of [indoor] [outdoor non-walk-in] construction {in lieu of outdoor [and housed in an outdoor POWER-ZONE center]}.  The sections shall contain the load interrupter switches and the necessary accessory components.  The equipment shall be factory-assembled (except for necessary shipping splits) and operationally checked.  The assembly shall be a self-supporting, floor mounted bay [and shall be securely bolted to the transformer to form an integrated structure.]  Each incoming bay shall be [14.75'] [20"] [29.5"] [39.37”] and each feeder bay shall be [14.75'] [20"] [29.5"] [39.37”].
C.	The equipment shall be designed for [front accessibility only] [{optional} rear access].
D.	Cable entry shall be [bottom] [top].
E.	The complete assembly shall be constructed in accordance with applicable provisions of ANSI / IEEE C37.20.3-1987 and the minimum construction standards of the manufacturers of the major components such as power fuses or potential transformers.  Provide adequate space for fuse handling when applicable.  {Insert when automatic fuse opening is specified}[For automatic fuse opening the switch-fuse combination shall  meet  the applicable sections of IEC 420 to ensure proper coordination of the proposed switch-fuse combination.  To comply with these requirements, a time delay relay may be used for fuse ratings that do not coordinate with the switch to ensure that any fault currents have decayed to values that the load interrupter switch can safely interrupt.]
F.	In establishing the requirements for the enclosure design, consideration shall be given to such relevant factors as controlled access, tamper resistance, protection from ingress of rodents and insects.
G.	Switchgear rated 600 amps continuous shall not require ventilation openings to aid in cooling of the associated components.
H.	The integrated fused switchgear assembly shall withstand the effects of closing, carrying and interrupting currents up to the assigned maximum short circuit rating.
I.	The switchgear shall be low maintenance designed to reduce the requirement for annual/ periodic maintenance of the equipment.  Equipment with scheduled maintenance intervals of 5 or more years is preferred.
J.	Two viewing ports shall be installed in the switch enclosure to enable visible verification of the switch blade position. 
K.	An animated mimic bus attached to the end of the operating shaft shall be provided to give visual indication of the position of the switch on each bay.
L.	System Voltage: [	] kV, three phase, [solidly grounded] [resistor grounded through a [	] ohm resistor] [ungrounded], [three phase 3 wire] [three phase 4 wire] .
M.	Operating Frequency:  [50] [60] Hz.
N.	Maximum Short Circuit Current: 25 kA RMS Symmetrical.
O.	Maximum Design Voltage:  [5.5] [17.5] [25.8] [38] kV.
P.	Basic Impulse LEVEL (BIL):  [60] [95] [110] [125] [150] kV.
Q.	Power Frequency Withstand:  [19] [36] [60] [80] kV.
R.	Short-Time Current (two second):	Interrupter switch		25 kA.
Grounding switch		25 kA
S.	Main Bus Ampacity:  [600] [1200] amperes, continuous.
T.	Integrated Short Circuit Rating: [25 kA] [38 kA] [50 kA] [65kA], RMS symmetrical.
2.03  COMPONENTS
*************************************************************************
Select the appropriate mechanism description (A, B,C)
*************************************************************************
A.	[Over Center Mechanism]
The load interrupter switch, rated 600 amperes continuous and interrupting, shall be fixed mounted [manually] [motor] operated, and shall be quick-make, quick-break with the speed of operation independent of the operator.  The grounding switch, on closing, shall be quick-make with the speed of operation independent of the operator.
To provide for dependable operation, the device shall not rely on chains or cables to drive the blade assemblies open and closed.  The operating mechanism shall be isolated from high voltage by a steel barrier and coupled through a direct drive shaft.  Access to mechanism parts shall not require de-energizing of the equipment.
B.	[Stored Energy Mechanism]
The load interrupter switch, rated 600 amperes continuous and interrupting, shall be fixed mounted [manually] [motor] operated, and shall be quick-make, quick-break with the speed of operation independent of the operator.  The stored energy mechanism shall be equipped with separate opening and closing springs.  The opening and closing springs shall be simultaneously charged in one action of the spring charging handle.  Operation of the load interrupter switch shall be by means of close/open pushbuttons.  [Provide a [120 VAC] [24 VDC] [48 VDC] [125 VDC] [250 VDC] close and trip coil].  The grounding switch, upon closing, shall be quick-make with the speed of operation independent of the operator.
To provide for dependable operation, the device shall not rely on chains or cables to drive the blade assemblies open and closed.  The operating mechanism shall be isolated from high voltage by a steel barrier and coupled through a direct drive shaft.  Access to mechanism parts shall not require de-energizing of the equipment.
C.	[Motor Operator]
[The motor operator shall be located in the mechanism compartment and shall not alter the dimensions of the equipment.  The motor operator shall have a control voltage disconnect switch accessible on front of mechanism cover with a provision for padlocking in the on and off positions.  Electrical operation of the device requires a [120 VAC] [24 VDC] [48 VDC] [125 VDC] [250 VDC] {consistent with close and trip coil, if so equipped}. The operating mechanism shall be isolated from high voltage by a steel barrier and coupled through a direct drive shaft.  Access to mechanism parts shall not require de-energizing of the equipment.
D.	The switch shall have three positions, open, closed and grounded.
*******Applications may exist where the grounding switch operation may be omitted. *************
E.	The switch shall have a four-time fault close capability.
F.	The switch shall be capable of 100 operations at 600 Amperes.
G.	The switch shall be capable of 1000 mechanical no load operations.
H.	The switch blades shall be contained in a single sealed for life enclosure.  The interrupting medium pressure within the enclosure shall not exceed 6 PSI (0.4 Bars) at 5 or 15kV class equipment or 22 PSI (1.5 Bars) at 25.8 or 38kV class equipment.  Refilling of the switch shall not be required.  Maintenance of the interrupter module shall not be required over its life.
I.	The switch operating handle shall be removable.  The handle must be suitable to operate the load interrupter mechanism as well as the ground switch mechanism.
J.	Voltage and Short Circuit Ratings: Match ratings specified for integrated assembly.
K.	Momentary Rating: 40kA RMS Asymmetrical.
L.	Fault Closing: [40 kA, RMS Asymmetrical] [32 kA, RMS Asymmetrical] {at 25.8 or 38 kV}.
M.	Load side live line indicators shall be provided as standard on the mechanism compartment.  The live line indicator assembly shall be mounted in the mechanism compartment and shall be an easily removable module containing three neon indicators powered from voltage dividers within the 3 standoff insulators.  [Optional incoming line or main bus live line indicators shall be provided as required and shall be mounted in the low voltage compartment.]
2.04  ACCESSORIES
A.	Provide a grounding switch on the load side of the fuses to discharge any capacitive voltage in the feeder cable prior to gaining access to the fuse compartment.  Switch shall be mechanically interlocked with the main grounding switch of the load interrupter switch.
B.	Surge Arresters {optional}(metal-oxide type):  [Distribution] [Intermediate] [Station] class, rated [		] kV, [	] MCOV; one per phase.  
C.	Incoming Cable Termination: An anti-rotational mounting pad shall have provision for [1] [2] single hole cable lugs.
D.	Provide [compression lugs] [mechanical lugs] for terminating cables onto the switchgear terminal pads.
E.	Provide a {optional}low voltage compartment to accommodate control circuit terminal blocks [and PowerLogic metering].  The low voltage/instrument compartment door shall be hinged.
F.	Provide two 2" {optional}[short-wave] [long-wave] infrared inspection windows per vertical section.  One window shall be for the lower compartment and the other for the upper compartment.
G.	Anti-condensation space heaters{optional for indoor}:  For [120] [240] VAC [supplied by user] [from control power transformer], sized by the manufacturer, with [thermostats] [humidistat.]
H.	Pad lock provisions for mechanism covers on the load interrupter switch and grounding switch mechanisms shall be supplied as standard to prevent unauthorized access to the operating mechanism.
I.	Mechanical Interlocks: 
1.	An interlock shall be provided on the grounding switch mechanism to prevent insertion of the operating handle and operation of the grounding switch when the load interrupter switch is in the closed position. {Include when ground switch is specified}
2.	An interlock shall be provided on the load interrupter switch mechanism to prevent insertion of the operating handle and operation of the load interrupter switch when the grounding switch is in the closed position.

3.	An interlock shall be provided to prevent the removal of the high voltage access panel with the load interrupter switch closed.  To access the high voltage compartment, the load interrupter switch must be opened and the grounding switch must be in the closed position.  The interlock must be directly attached to the operating mechanism and should not rely on long cables and linkages.
4.	To facilitate cable testing in the high voltage compartment, the grounding switch can be returned to the open position.  In this position interlocks are to be provided to prevent replacement of the high voltage access panel and prevent closure of the load interrupter switch. {Include when ground switch is specified}
J.	Key Interlocks: [Schneider Locks]
K.	Voltage Transformer Options:
A voltage transformer bay shall contain a load interrupter with grounding switch.  The voltage transformer shall be [		]: 120 VAC.
The width of the unit shall be 20" or 29.5". [For both 5 and 17.5 kV.]
L.	Control Power Transformer Options:
A control power transformer bay shall contain a load interrupter with grounding switch.
Control Power Transformer, [single phase] [three phase], with primary disconnect fuse, 240/120 VAC secondary, [5] [10] [15] kVA.
The width of the unit shall be 29.5". [for both 5 and 17.5 kV.]
M.	Current Transformer Options:
Each bay containing a load interrupter shall include the following [as shown on the drawings]:
[Cable mounted] [Bus mounted] [3] [6] Donut Type Current Transformers  [	]:5A. 
N.	Metering Options:
[Each] bay[s] containing a load interrupter switch shall include the following [as shown on the drawings]:
1.	PowerLogic Circuit Monitor, [with digital display][with waveform capture][stand-alone] wired for communications to other [devices.]
2.	PowerLogic System Display, [with printer port][wired out to a receptacle]
3.	PowerLogic digital meter.
4.	Ammeter with Selector Switch, [1%] [2%] Accuracy.
5.	Voltmeter with Selector Switch, [1%] [2%] Accuracy.
6.	Other: [		]
O.	Automatic Load Transfer Control:
1.	An automatic load transfer system shall be provided for a [Main-Main (Common-Bus Primary-Selective System)] [Main-Tie-Main (Split-Bus Primary-Selective System)] arrangement.  The system shall automatically control motor operated load interrupter switches to provide transfer of the medium-voltage circuit to an alternate circuit upon loss of voltage of the normal source(s).  Potential transformers feeding phase balance and undervoltage relays are provided to continuously monitor all three phases on both sources.
2.	The system shall consist of a MODICON programmable logic controller or a relay system, potential transformers, control power transfer contactor, control selector switches, two three-phase, phase-balance/undervoltage (47N/27) relays, and status indicating lights.
3.	The potential transformers shall also provide 120 VAC control power for the motor operators and the logic control.  Other accessories for the system include:
a.	1- Auto/Manual selector switch with indicating lights.
b.	1- Hold Return/Auto Return selector switch with indicating lights.
c.	1- Closed Transition/Open Transition selector switch with indicating lights.
d.	1- Preferred Source selector switch with indicating lights (main-main system).
e.	2- Undervoltage test push buttons.
f.	2- Close push buttons with indicating lights.
g.	2- Open bush buttons with indicating lights.

4.	Sequence of operation:
************************************************************************
Select the appropriate description
*************************************************************************
a.	Main - Main System:
1)	The normal conditions shall be with one source (designated as preferred) closed and with the other source (designate as the alternate) open but available to provide power.  A transfer is initiated after a six (6) [	] second time delay upon detection of a phase unbalance and/or undervoltage condition on the preferred source.  The normal source switch will open within three (5) cycles after the time delay.  The alternate source switch will close within 5 cycles after the time delay.  The re-transfer will occur after the voltage on the normal source returns and stabilizes for five (5) [		] minutes.  The time registers are adjustable by the use of a hand held programmer.
2)	The automatic transfer switches shall be equipped with a motor operator, close coil and opening coil. 
3)	The two switches shall be electrically and mechanically interlocked to prevent inadvertent paralleling of the preferred and alternate sources.
b.	Main - Tie - Main System:
1)	The normal condition shall be with the two Main sources closed and the Tie switch open.  A transfer is initiated after a six (6) [	] second time delay upon detection of a phase unbalance and/or undervoltage condition on either of the sources. The affected source switch will open within five (5) cycles after the time delay.  The tie switch will close within 5 cycles after the time delay.  The re-transfer will occur after the voltage on the affected source returns and stabilizes for five (5) [		] minutes.  The time registers are adjustable by the use of a hand held programmer.
2)	The automatic transfer switches shall be equipped with a motor operator , close coil and opening coil. 
2.05  FABRICATION
A.	Construction: [Indoor.] [Outdoor, non-walk-in.] Each equipment bay shall be a separately constructed cubicle assembled to form a rigid free standing unit. Minimum sheet metal thickness shall be 11 gauge steel on all exterior surfaces. Adjacent bays shall be securely bolted together to form an integrated rigid structure.  Each individual unit shall be braced to prevent distortion.
B.	All bus joints shall use Belleville washers.  Torque bolts that are used for bus joints or for insulators and direct support of any current carrying parts shall be marked with a bead of highly visible bright orange "torque seal", that will readily show when a bolt has loosened.
C.	The high voltage non-disconnect type fuses (when required), shall be accessible only through a separate panel mechanically interlocked with the switch.  [Where grounding switches are supplied, access panels shall not be removable unless the grounding switch is in the closed position.]  [If grounding switches are defeated, access panels shall not be removable unless the load interrupter switch is in the fully open position.] Screened or penetrable barriers which may allow intentional or inadvertent contact with energized parts shall not be permitted.
D.	The duplex switch configuration shall be equipped with a mechanical interlock between the two switches preventing paralleling of the two incoming lines.  A single access panel shall be provided to the load side of the duplex configuration requiring that both switches shall be opened [and grounded] prior to accessing the fuses and load cable terminations.
E.	Height: [	] inches, maximum including auxiliary support members on top and bottom.
************************************************************************************
Choose the appropriate height from the table below based on indoor or outdoor and voltage class.
************************************************************************************
Maximum		Indoor			Outdoor
Voltage			Single / Multiple		Single / Multiple
4.76 & 15.0 kV		90"			99.75"
Maximum		Indoor			Outdoor
Voltage			Single / Multiple		Single / Multiple
25.8 & 38.0 kV		108”			118.45

F.	Main bus shall be tin-plated copper, [non-insulated] [insulated] rated [600] [1200] amps, and shall be supported directly by the switch.
G.	[For single bays, include a ground pad with lug.] [For multiple bay lineups, include continuous ground bus through the switchgear assembly, securely connected to the steel frame of each cubicle.]
H.	Main bus and ground bus connections shall be designed for easy for future extensions. Cutout areas with removable bolted on covers shall allow for future extension of the main bus. A knock-out shall be removable for the extension of the ground bus.
******************************************************************
Use the following paragraph for outdoor applications only.
******************************************************************
I.	Outdoor units shall be designed with a sloped, drip-proof roof. The cubicles must have a door-in-door construction. The front outer door shall be a bulkhead type door with three point latching and vault type handle with provisions for padlocking.  Cubicles are to be designed to allow front and rear access and shall not require the routing of line side or load side connections in front of the switch/fuse compartment.  The roof design shall minimize the number of roof seams by covering several bays with one closure to reduce installation time and potential for leakage.
J.	Anti-condensation space heaters: For [120] [240] VAC [supplied by owner] [from control power transformer], sized by the manufacturer, with [thermostats] [humidistat.]
K.	The metal-enclosed switchgear shall be fully assembled, inspected and tested at the factory prior to shipment.  Large line-ups shall be split to permit normal shipping and handling as well as for ease of rejoining at the job site.
2.06  FACTORY FINISHING
A.	All non-painted steel parts shall be zinc plated.
B.	All painted steel parts shall be cleaned and a zinc-phosphate pre-treatment applied prior to paint application.
C.	Paint Color shall be ANSI-61 (light gray) TGIC polyester powder, applied electrostatically through air. Following paint application, parts shall be baked to produce a hard durable finish.  The average thickness of the paint film shall be 2.0 mils.  Paint film shall be uniform in color and free from blisters, sags, flaking and peeling.
D.	Adequacy of paint finish to inhibit the buildup of rust on ferrous metal materials shall be tested and evaluated per paragraphs 5.2.8.1-7 of ANSI C37.20.3-1987.  Salt spray withstand tests in accordance with paragraph 5.2.8.4 shall be performed on a periodic basis to provide conformance to this corrosion resistance standard of at least 3500 hours minimum.

PART 3  EXECUTION
*************************************************************************************
The following paragraphs in this section represent work that is to be performed by the installing contractor.  If this specification is written for the switchgear manufacturer only, eliminate these sections.
*************************************************************************************
3.01 EXAMINATION
A.	Visually inspect switchgear for evidence of damage and verify that surfaces are ready to receive work.
B.	Visually inspect to confirm that all items and accessories are in accordance with specifications and drawings.
C.	Verify field measurements are as [shown on Drawings] [shown on shop drawings] [instructed by manufacturer.]
D.	Verify that required utilities (e.g., control voltage for heater circuits on outdoor switchgear) are available, in proper location, and ready for use.
E.	Beginning of installation means installer accepts existing surface conditions.
3.02 INSTALLATION
A.	Install in accordance with manufacturer's instructions, applicable requirements of the NEC and in accordance with recognized industry practices.
B.	[Connect the primary surge arresters if not connected.  If required, use jumper cables, as provided by the switchgear manufacturer.]
C.	Bending of high-voltage cables should be avoided or minimized. All necessary bends should meet at least the minimum radii specified by the cable manufacturer.
3.03 FIELD QUALITY CONTROL
A.	Field inspection and testing will be performed by [the installing contractor] [a separate contractor furnished by the owner] under provisions of Section 01400.
B.	Visually inspect switchgear for physical damage upon receipt.
C.	Perform mechanical operator tests in accordance with manufacturer's instructions. 
D.	Check torque of all bolted connections, including cable terminations, either by observing the bead of indicating compound to confirm that it is still intact, or with a torque wrench to confirm the joint is tightened to the manufacturer's specifications.
E.	Touch-up all chips and scratches with manufacturer-supplied paint and leave remaining paint with Owner.
F.	Verify key interlock operation if applicable.
G.	Perform insulation resistance test on each phase to ground and phase to phase. Record results for future reference.
H.	Perform low-frequency withstand tests according to ANSI/IEEE C37.20.3, paragraph 5.5.
I.	Perform contact resistance test across each switch blade; report any contact resistance in excess of 50 micro-ohms.
END OF SECTION