SECTION 16311A INTEGRATED UNIT SUBSTATIONS (IUS) SECONDARY LESS THAN 1000 V

INTEGRATED UNIT SUBSTATIONS (IUS) SECONDARY LESS THAN 1000 V PART 1 GENERAL 1.01 SCOPE A. The Contractor shall furnish and install the integrated unit substation (IUS) complete from the incoming line terminals to the outgoing line terminals as specified herein and as shown on the contract drawings. B. The integrated unit substation shall consist of primary breaker, dry type transformer, & secondary main & distribution sections as required. The manufacturer of the integrated unit substation shall furnish and coordinate all major components of the IUS, including incoming primary equipment section, transformer and low-voltage section, as well as circuit breakers, and metering components. Provide a single warranty covering all substation assemblies, transformers and components. C. Connections between the primary device and transformer shall be direct cable, and between the transformer and secondary shall be flexible bus braid. 1.02 RELATED SECTIONS A. Section 16426A Metal-Enclosed Drawout Switchgear (Magnum DS) Low Voltage B. Section 16322B Substation Transformers Dry-Type -- OR -- B. Section 16322C Substation Transformers Resibloc Cast Resin -- OR -- B. Section 16322D Substation Transformers Vacuum Cast-Coil Design 1.03 REFERENCES A. The integrated unit substation shall be designed, assembled, tested and installed in accordance with latest applicable standards of NEMA, IEEE and ANSI, applicable to its three major sections: 1. MV Metal-Enclosed Switchgear NEMA SG4, SG5; ANSI C37.20.3 2. Secondary Substation Transformers NEMA 210, IEEE 100, ANSI C57 3. LV Metal-Enclosed Switchgear ANSI C37.20.1, ANSI C37.51, UL 1558 1.04 SUBMITTALS FOR REVIEW/APPROVAL A. The following information shall be submitted to the Engineer: 1. Master drawing index 2. Front view elevation 16311A-1 02/20/13

3. Floor plan 4. Single line INTEGRATED UNIT SUBSTATIONS (IUS) SECONDARY LESS THAN 1000 V 5. Schematic diagram 6. Nameplate schedule 7. Component list 8. Conduit entry/exit locations 9. Assembly ratings including: a. Short-circuit rating b. Voltage c. Continuous current d. Basic Impulse level for equipment over 600 volts e. kva 10. Major component ratings including: a. Voltage b. Continuous current c. Interrupting ratings 11. Cable terminal sizes 12. Connection details between close-coupled assemblies 13. Composite front view and floor plan of close-coupled assemblies 14. Impedance for transformers 15. Product data sheets B. Where applicable, the following additional information shall be submitted to the Engineer: 1. Busway connection 2. Key interlock scheme drawing and sequence of operation 1.05 SUBMITTALS FOR CONSTRUCTION A. The following information shall be submitted for record purposes: 1. Final as-built drawings and information for items listed Paragraph 1.04, and shall incorporate all changes made during the manufacturing process 2. Wiring diagrams 3. Certified production test reports 4. Installation information 5. Seismic certification as specified 1.06 QUALIFICATIONS A. The manufacturer of the assembly shall be the manufacturer of the major components within the assembly. B. For the equipment specified herein, the manufacturer shall be ISO 9001 or 9002 certified. C. The manufacturer of this equipment shall have produced similar electrical equipment for a minimum period of five (5) years. When requested by the Engineer, an acceptable list of 16311A-2 02/20/13

installations with similar equipment shall be provided demonstrating compliance with this requirement. D. Provide Seismic qualified equipment as follows: 1. The equipment and major components shall be suitable for and certified by actual seismic testing to meet all applicable seismic requirements of the 2006 International Building Code (IBC). Equipment certification acceptance criteria shall be based upon the ability for the equipment to be returned to service immediately after a seismic event within the above requirements without the need for repairs. 2. The following minimum mounting and installation guidelines shall be met, unless specifically modified by the above referenced standards. a. The Contractor shall provide equipment anchorage details, coordinated with the equipment mounting provision, prepared and stamped by a licensed civil engineer in the state. Mounting recommendations shall be provided by the manufacturer based upon the above criteria to verify the seismic design of the equipment. b. The equipment manufacturer shall certify that the equipment can withstand, that is, function following the seismic event, including both vertical and lateral required response spectra as specified in above codes. c. The equipment manufacturer shall document the requirements necessary for proper seismic mounting of the equipment. Seismic qualification shall be considered achieved when the capability of the equipment, meets or exceeds the specified response spectra. 1.07 REGULATORY REQUIREMENTS A. Certified copies of production test reports shall be supplied demonstrating compliance with these standards when requested by the engineer. 1.08 DELIVERY, STORAGE AND HANDLING A. Equipment shall be handled and stored in accordance with manufacturer's instructions. One (1) copy of these instructions shall be included with the equipment at time of shipment. 1.09 OPERATION AND MAINTENANCE MANUALS A. Equipment operation and maintenance manuals shall be provided with each assembly shipped and shall include instruction leaflets, instruction bulletins, and renewal parts lists where applicable for the complete assembly and each major component. PART 2 PRODUCTS 2.01 MANUFACTURERS A. Eaton B. Note to Spec. Writer - Optional Note to Spec. Writer Insert data in blanks 16311A-3 02/20/13

C. INTEGRATED UNIT SUBSTATIONS (IUS) SECONDARY LESS THAN 1000 V The listing of specific manufacturers above does not imply acceptance of their products that do not meet the specified ratings, features and functions. To eliminate possible disputes between circuit breaker and switchgear coordination, the manufacturer of the switchgear shall also be the manufacturer of the circuit breaker. Manufacturers listed above are not relieved from meeting these specifications in their entirety. Products in compliance with the specification and manufactured by others not named will be considered only if pre-approved by the Engineer ten (10) days prior to bid date. 2.02 PRIMARY EQUIPMENT (5KV & 15KV CLASS) A. The primary section described in this specification shall be designed for operation on a [2.4] [3.3] [4.16] [4.8] [6.9] [7.2] [8.4] [11] [11.5] [12] [12.47] [13.2] [13.8] [14.4] kv, 3- phase, [3] [4] wire, [solidly grounded] [ungrounded] [low impedance grounded] [high impedance grounded], [50][60] Hertz system. B. The primary section main bus (when applicable) shall be rated [600A] [1200] amperes. The primary section shall be constructed so that all buses, bus supports and connections shall withstand stresses that would be produced by fault currents equal to the close and latch rating of the circuit breakers. The short time short circuit current withstand capability of the busses shall be the same as that of the primary circuit breakers. The temperature rise of the bus and connections shall be in accordance with IEEE standard C37.20.3 and C37.20.2, and documented by design tests. The primary equipment compartment (5kV or 15kV), including all busses, breakers, and instrument transformers, shall be completely isolated from the secondary equipment compartment (600VAC) by means of grounded steel or glass polyester barriers. The primary section shall be located in the lower half of the IUS structure, with the secondary main section located in the top half of the IUS structure. Each primary circuit breaker load side studs shall be equipped with insulated copper extension buses terminating in solderless type terminals in the rear cable compartment for direct cable connection to the transformer. Incoming primary cables shall enter the IUS structure from the [top via steel wireways into the lower primary termination compartment.] [bottom. Additional space underneath the IUS structure may be required for stress cone connection for bottom incoming cable] C. Each primary circuit breaker shall have the following ratings: Note to Spec. Writer: Insert PRIMARY circuit breaker ratings below from Table 16347C-1 Rated Maximum Voltage kv 1-minute Power Freq withstand voltage kv RMS Impulse withstand voltage (BIL) kv Peak Continuous Current As shown on drawings Rated Short-Circuit Current at Rated Maximum Voltage ka RMS Sym. Rated Voltage Range Factor K 1.0 Maximum symmetrical Interrupting and Note to Spec. Writer Insert data in blanks 16311A-4 02/20/13

2-Sec short-time current carrying capability ka RMS Sym Closing and Latching Capability ka peak 3-Phase MVA at rated maximum voltage. Rated Interrupting Time 5 Cycle Rated Maximum Voltage 1-minute Power Frequency withstand voltage Impulse withstan d voltage (BIL) Table 16347C-1 Rated Short Circuit Current at Rated Maximum Voltage Rated Voltag e Range Factor Maximum Sym. Interrupting and 2- second Short Time Current Carrying Capability Closing and Latching Capability (Momentary) 3-phase MVA at rated maximum voltage (for reference only) V I K K * I 2.6 * K * I kv RMS KV RMS kv peak ka RMS sym ka RMS sym ka Crest MVA 4.76 19 60 16 1.0 16 42 130 4.76 19 60 20 1.0 20 52 165 4.76 19 60 25 1.0 25 65 210 15.0 36 95 16 1.0 16 42 420 15.0 36 95 20 1.0 20 52 520 15.0 36 95 25 1.0 25 65 650 D. Primary Circuit Breaker 1. The primary circuit breaker shall utilize vacuum interrupters for interruption and switching functions. The current transfer between the circuit breaker and phase conductors in the compartment shall be via heavily silver plated and spring loaded copper finger cluster (phase disconnect) on the breaker, and rigidly mounted silver plated copper stabs within the insulated housing mounted on the compartment wall. The current transfer from vacuum interrupter moving stem to the primary disconnect cluster on the breaker shall be non-sliding type via heavily silver or tin plated flexible copper leaf conductors attached on each end. 2. Each primary circuit breaker shall be supplied with contact surface erosion (contact wear) indicator that requires no tools or measurements for the checking of the contact surface erosion. 3. Each primary circuit breaker shall be equipped with high-speed stored energy operating mechanism and shall permit open-close-open (OCO) operating sequence without recharging the closing springs. 4. The primary breaker front panel shall be removable when the compartment door is open for ease of inspection and maintenance of the mechanism. Note to Spec. Writer Insert data in blanks 16311A-5 02/20/13

5. Each primary circuit breaker shall be equipped with mechanical operations counter on the front of the breaker to provide record of the number of circuit breaker operations. 6. Each primary circuit breaker shall include contacts Open/Close and spring Charged/Discharged status indications on the front of the breaker. 7. Each primary circuit breaker shall be supplied with an auxiliary switch with 5 NO and 5 NC contacts. The switch shall be heavy duty, double break type with wipe type contacts. All unused contacts from this switch shall be wired out to terminal blocks for owner s use. 8. Primary circuit breakers shall be manually operated (MO) unless shown on the drawings as electrically operated (EO). Energy required for closing and opening of the circuit breaker shall be provided by manual charging of springs. The spring charging handle shall be integral to the circuit breaker and conveniently located on the front of the circuit breaker. 9. Each primary circuit breaker shall be supplied with Manual ON and OFF push buttons located on the front of the circuit breaker for opening and closing the breaker manually, without a need for external control power. 10. Where indicated on the drawings as EO, each primary circuit breaker shall be electrically operated. Energy required for closing and opening of the circuit breaker shall be provided by charging of springs by an electrical motor. Electrical closing/opening of the circuit breaker shall be accomplished by energizing spring release coil/shunt trip coil. Control voltage required for electrical operation of the circuit breaker shall be [derived from a control power transformer mounted within the switchgear] [supplied by owner from an external source] and shall be as follows: a. [120] [240] VAC CLOSE and AC Capacitor Trip. -- OR-- b. [24] [48] [125] VDC CLOSE, and [24] [48] [125] VDC Trip. 11. One control circuit cutout device shall be provided and installed in the control compartment of each primary circuit breaker for control circuit isolation and short circuit protection. 12. All primary EO circuit breakers shall also be supplied with a spring charging handle located on the front of the circuit breaker for manually charging closing springs during an emergency or for maintenance. Manual ON and OFF push buttons shall be located on the front of the circuit breaker for opening and closing the circuit breaker manually. 13. For primary MO circuit breakers, provide pad lockable hinged plastic cover to limit access to Manual ON and OFF push buttons. 14. For primary EO circuit breakers, provide pad lockable hinged plastic cover to limit access to Manual OFF pushbutton and completely prevent access to Manual ON pushbutton. E. Primary Trip Units 1. The switchgear manufacturer shall furnish and install, in the metal-enclosed switchgear, the quantity and type of primary trip units and current sensors or protection relays and Note to Spec. Writer Optional 16311A-6 02/20/13

current transformers as indicated on the drawings and described hereinafter in this specification. 2. Microprocessor Based Three-Phase & Ground Overcurrent & Voltage Protection Circuit Breaker Relay System with metering and on-board display capability (Eaton type Digitrip 1150V or equivalent) Note to Spec Writer -The Digitrip 1150V is a relay integral to the primary circuit breaker. It can be applied with Manually Operated (without a need for external control power) or Electrically Operated circuit breakers. Application of this device with MO or EO operated circuit breakers can result in cost savings compared to EO circuit breakers with external relays. a. The three-phase and ground overcurrent and voltage protective relay system shall consist of Eaton Digitrip 1150V or equivalent trip unit, Type-V or equivalent current sensors and matching rating plug for the trip unit, and mechanical trip actuator. The trip unit shall be UL recognized, CSA approved, and carry CE mark. b. The mechanical trip actuator assembly and the relay shall be installed on the circuit breaker. The relay shall be front accessible. The current sensors shall be installed over insulated bushings, one in each phase, in the primary circuit. The assembly of the bushings and current sensors shall withstand rated impulse voltage of the assembly. Each relay shall have rating plug installed that is matched to the associated current sensor rating. Provide an additional rating label on the back surface of the compartment door as a reference to indicate the current sensor and rating plug ratings used for primary circuit associated with that compartment. c. The current sensor rating for each circuit shall be as indicated on the drawings or specified hereinafter in this specification. The current sensors produce a secondary output current proportional to the load current. The current sensors and rating plug defines the maximum continuous current rating of the circuit breaker (In). The overcurrent protection functions of the relay shall be self-powered from the current flowing in the secondary of the current sensors. The relay shall continuously analyze the secondary current signals and, when preset current levels and time delay settings are exceeded, send an initiating trip signal to the trip actuator of the circuit breaker. The trip actuator shall cause tripping of the circuit breaker by providing the required mechanical force for the tripping. The primary circuit breaker mechanism shall automatically reset the trip actuator each time the circuit breaker opens. d. The primary circuit breaker relay shall provide following ANSI/IEEE protection functions: 1. 51/50 (time and instantaneous overcurrent) for each of the (3) phases 2. 51/50N or 51/50G (time and instantaneous overcurrent) for ground 3. 37 (phase loss, with adjustable time delay) 4. 46 (current unbalance, with adjustable time delay) 5. 27 (3-phase undervoltage, with adjustable time delay) 6. 59 (3-phase overvoltage, with adjustable time delay) 7. 81U (underfrequency, with adjustable time delay) 8. 81O (overfrequency, with adjustable time delay) 16311A-7 02/20/13

9. 47 (voltage unbalance, with adjustable time delay) 10. 32 (reverse power, with adjustable time delay) e. The primary relay shall be microprocessor based that operates from secondary output of current sensors and external voltage transformers and provide true RMS sensing of each phase and ground, and suitable for application to either 50 or 60 Hz systems. The ground protection shall be capable of being utilized in residual scheme, zero sequence scheme, or deactivated. The overcurrent protection functions of the relay shall be self-powered from the current flowing in the secondary of the current sensors. The auxiliary power required for voltage and frequency related protection and alarm functions shall be [120 VAC] [230 VAC] [24 to 48 VDC] [125 VDC] +/- 10%, and shall be [supplied by an owner from a reliable external source] [derived from UPS module powered from a CPT within the switchgear lineup]. f. The phase and ground time-overcurrent response curves shall have selectable characteristics as follows: 1. Phase Long Delay: I 2 t, I 4 t, IEEE Moderately Inverse, Very Inverse, or Extremely Inverse 2. Phase Short Delay: FLAT or I 2 t 3. Phase Instantaneous: FLAT or I 2 t 4. Ground Overcurrent: FLAT or I 2 t g. Phase Long Delay protection shall have memory feature, when enabled, shall cause breaker to trip in progressively shorter time if the primary circuit breaker trips and recloses on repeated overload conditions. The memory feature shall reset when at least 10 minutes have elapsed between the overloads. h. The relay shall have ground fault memory to protect loads in the event of an arc-toground. The ground protection shall remember the arc-to-ground event for up to ten (10) times the time setting to allow detection of the ground fault. After the expiration of the time, the unit shall reset automatically. i. The sensing current for Ground protection shall be derived from the residual connections of the phase sensors or a separate Eaton Type-V or equivalent zero sequence sensor as indicated on the drawings or specified herein after in this specification. j. The primary relay shall accept secondary output of 110 or 120 VAC, derived from a set of external primary voltage transformers, connected in two line-to-line or three line-to-ground configurations. The primary voltage transformer ratio shall be programmable for correct display of measured primary voltages, power, and energy values. k. The primary relay shall have a built-in 24-character alpha-numeric LED display to allow programming and viewing of settings, menus, trip and alarm logs, and real time metering data. All settings shall be programmable through use of appropriate buttons located on the front of the unit. l. Primary relay shall be capable of displaying following meter values: 1. Individual phase and ground currents in RMS amperes, real time 2. Individual phase and ground currents in average RMS amperes (5 minute average) 16311A-8 02/20/13

3. Individual phase and ground currents, maximum and minimum (since last reset) 4. Line-to-Line Voltages V-AB, V-BC, V-CA 5. Forward/Reverse kw, kw Demand, and Max kw Demand 6. KVA, kva Demand, and Max kva Demand 7. Watt and VA demand, maximum W and VA demand 8. Forward/Reverse kwh 9. KVAh 10. Total Harmonic Distortion for each phase current 11. Individual harmonic currents up through 27 th harmonic for each phase 12. Power factor, minimum, maximum 13. Frequency 14. Circuit breaker operations count 15. Metering accuracy shall be minimum: a. +/- 1% of full-scale (In) for currents for currents in the range of 5 to 100% of (In) b. +/- 3% of full-scale for voltages (full-scale is equal to VT primary voltage) c. +/- 4% of full scale for power and energy readings 16. The primary relay shall be capable of communication via Cutler-Hammer PowerXpert system to a remote master computer via a PowerXpert Gateway. The communication shall include display of monitored values, trip/alarm events, remote open/close controls, and waveform capture and display. 17. Provide one interface module to translate C-H INCOM protocol to MODBUS protocol for communication with remote Modbus master. 18. The primary relay shall have programmable output contacts, designated as Relay contacts A, B, and C. The Relay contact A can be programmed and activated for one or more trip or alarm conditions or it can be programmed for use as a pulse initiator for either kwh or kvah functions to transmit kwh or kvah pulses to an external counter. The Relay contact B can be programmed and activated for one or more trip conditions for use as blocking relay to prevent closing of the circuit breaker after a trip until the trip unit is reset. The Relay contact C can be programmed and activated and latched for one or more trip conditions. m. Zone Interlocking 1. The Phase Short Delay time overcurrent and Ground time overcurrent protection functions shall be capable of being zone interlocked between two or more primary relays OR secondary trip units, to provide the fastest possible tripping for faults within the zone of protection of the primary OR secondary circuit breaker, and yet also provide positive coordination among all primary OR secondary circuit breakers in the system to limit power outage to only the affected part of the system. Zone Interlocking wiring shall be provided when indicated on the drawings or specified herein after in this specification. When Zone Interlocking is employed, a fault within the zone of protection in the primary OR secondary circuit breaker shall cause the appropriate primary relay OR secondary trip unit to simultaneously trip the affected primary OR secondary Note to Spec. Writer Optional 16311A-9 02/20/13

circuit breaker immediately, and send a signal to upstream primary relay OR secondary trip unit to restrain from tripping immediately. The restraining signal shall cause the upstream protective devices to follow their set coordination times, so that the service is only minimally disrupted while the fault is cleared in the shortest possible time. n. The primary relay shall be provided with a green LED (for unit status) that blinks approximately once every second to indicate that the trip unit is energized and operating properly. The overcurrent functions of the relay shall become selfpowered once the 3-phase load current through the circuit breaker exceeds approximately 10-12% of the current sensor rating or 1-phase load current exceeds approximately 30% of the current sensor rating. o. The primary relay shall be provided with representation of the time-current curve depicted on the faceplate of the unit that indicates the protection functions. The relay shall have battery backed-up LED s strategically located in the related segment of the time-current representation to indicate mode of trip following an automatic trip operation. A battery test button shall be provided to confirm battery status and to reset the LED s. All protection function of the unit shall be independent of the battery. The battery shall be used to for trip indication LED s only. The battery shall be 3 volt, 1/3N lithium cell. It shall be front accessible and shall not affect operation of the relay or its protection function when installing/removing even when circuit breaker is in service. p. The primary relay shall provide following data through its front panel display to help plan inspection and maintenance schedules of the circuit breaker and circuit it is protecting: 1. -Total number of instantaneous and short delay trip operations by the circuit breaker since last reset 2. -Total number of overloads (long delay trips) and ground fault trips since last reset 3. -Total number of Close Operations by the circuit breaker since last reset 4. -The last time the circuit breaker was operated (Opened or Closed or Tripped) with time and date 5. -Maximum chip temperature in degrees C as seen by the trip unit q. The relay shall have a test access port, protected by removable Plexiglas cover, for interface with a hand held tester capable of testing trip elements of the trip unit, and mechanical trip assembly of the circuit breaker. r. Provide one hand held tester s. Provide communication cable (TripLink) to transfer settings from one relay to another via test access ports of the trip units. 3. When shown on the drawings or specified herein after, provide primary circuit breakers with Overcurrent Trip Switch (OTS). The switch shall operate when the circuit breaker has been tripped by the action of an integral protective relay. The switch shall have one Form-C contact wired out to terminal blocks, unless noted otherwise on the drawings. When the switch operates, its contact shall change state and remain in that state until the switch is manually reset. Note to Spec. Writer Optional 16311A-10 02/20/13

2.03 TRANSFORMER SECTION *Note to Spec. Writer: Select transformer from one of the following: Products A Product Transformers Dry-Type Transformers Section 16322B Part 2 RESIBLOC Cast Resin Transformers Section 16322C Part 2 Cast-Coil Transformers Section 16322D Part 2 ** Note that the transformer core & coils will be rotated 90 degrees to allow for a reduction in overall transformer enclosure width. High voltage and low voltage connections will be on the same side of the transformer, and shall be per section 1.01.C. 2.04 SECONDARY EQUIPMENT (600V CLASS) A. Secondary Ratings 1. Secondary voltage rating shall be as indicated on the drawings. The entire secondary section shall be suitable for 600VAC maximum service. 2. The secondary assembly shall be rated to withstand mechanical forces exerted during short-circuit conditions when connected directly to a power source having available fault current [of (42,000) (65,000) (85,000) (100,000) amperes symmetrical at rated voltage] [as shown on the drawings]. 3. The secondary bus system shall have a minimum ANSI short-circuit withstand rating of [100,000] [150,000] amperes symmetrical tested in accordance with ANSI C37.20.1 and UL1558. 4. All secondary circuit breakers shall have a minimum symmetrical interrupting capacity of [42,000] [50,000] [65,000] [85,000] [100,000] amperes. To ensure a fully selective system, all circuit breakers shall have 30 cycle short-time withstand ratings equal to their symmetrical interrupting ratings through 85,000 amperes, regardless of whether equipped with instantaneous trip protection or not. 5. All secondary ratings shall be tested to the requirements of ANSI C37.20.1, C37.50 and C37.51 and UL witnessed and approved. B. Secondary Construction 1. The secondary MAIN compartment shall be located above the primary compartment as described in section 2.02.B, all in one section. The individual primary & secondary compartments shall have sufficient grounded steel or glass polyester barriers to prevent 16311A-11 02/20/13

access between the two compartments. Connections to both the MV and LV terminals on the transformer shall be made from this section, as described in section 1.01.C. Each secondary main circuit breaker load side studs shall include the necessary threephase bus connections to the main vertical section bus. 2. The secondary FEEDER section(s) shall consist of the required number of vertical sections bolted together to form a rigid assembly. The sides shall be covered with removable bolt-on covers. All edges of front covers or hinged front panels shall be formed. Provide ventilators located on the top of the switchgear over the breaker and bus compartments to ensure adequate ventilation within the enclosure. [The rear covers shall be fabricated in two (2) pieces for ease of handling and shall be mounted using captive hardware] [Hinged rear doors, complete with provisions for padlocking, shall be provided.] 3. The secondary assembly shall be provided with adequate lifting means and shall be capable of being moved into installation position and bolted directly to [Contractor supplied floor sills to be set level in concrete per manufacturer s recommendations] [the floor without the use of floor sills providing the floor is level to 1/8 inch per 3-foot distance in any direction]. Provisions shall be made for jacking of shipping groups, for removal of skids or insertion of equipment rollers. Base of assembly shall be suitable for rolling directly on pipes without skids. The base shall be equipped with slots in the base frame members to accommodate the use of pry bars for moving the equipment to its final position. 4. Each vertical steel unit forming part of the switchgear line-up shall be a self-contained housing having one or more individual breaker or instrument compartments, a centralized bus compartment and a rear cable compartment. Each individual primary or secondary circuit breaker compartment, or cell, shall be segregated from adjacent compartments and sections by means of steel barriers to the maximum extent possible. It shall be equipped with draw-out rails and phase & control disconnecting contacts. Removable hinge pins shall be provided on the primary and secondary breaker compartment door hinges. Current transformers for feeder instrumentation, where shown on the plans, shall be located within the appropriate breaker cells and be front accessible and removable. 5. The stationary part of the phase disconnecting devices for each power circuit breaker shall be breaker mounted and consist of a set of contacts extending to the rear through glass polyester insulating support barrier; corresponding moving finger contacts, suitably spaced, shall be furnished on the power circuit breaker studs which engage in only the connected position. The assembly shall provide multiple silver-to-silver full floating high pressure point contacts with uniform pressure on each finger maintained by springs. Each feeder circuit breaker shall include the necessary three-phase bus connections between the section bus and the breaker line side studs. Load studs shall be equipped with insulated copper load extension buses terminating in solderless type terminals in the rear cable compartment of each structure. Bus extensions shall be [silver-plated] [tin-plated] where outgoing terminals are attached. 6. The secondary circuit breaker door design shall be such that the following functions may be performed without the need to open the circuit breaker door: lever circuit 16311A-12 02/20/13

breaker between positions, operate manual charging system, close and open circuit breaker, examine and adjust trip unit, and read circuit breaker rating nameplate. 7. The control disconnecting devices shall consist of floating terminals mounted on the stationary unit and engaging mating contacts at the front of the breaker. The control disconnecting devices shall be gold-plated and engagement shall be maintained in the connected and test positions. 8. The removable secondary power circuit breaker element shall be equipped with disconnecting contacts and interlocks for drawout application. It shall have four positions, connected, test, disconnected and removed. The breaker drawout element shall contain a worm gear levering in and out mechanism with removable lever crank. Levering shall be accomplished via the use of conventional tools. Mechanical interlocking shall be provided so that the breaker is in the tripped position before levering in or out of the cell. Interlocking that trips the breaker will not be accepted. The breaker shall include an optional provision for key locking open to prevent manual or electric closing. Padlocking shall provide for securing the breaker in the connected, test, or disconnected position by preventing levering. 9. An insulating flash shield shall be mounted above each circuit breaker to prevent flashover from the arc chutes to ground. 10. The secondary switchgear shall be Eaton Magnum DS low voltage metal-enclosed switchgear, utilizing Magnum DS power circuit breakers as herein specified. 11. The switchgear shall be suitable for use as service entrance equipment and be labeled in accordance with UL requirements. 12. Provide a rear compartment barrier between the cable compartment and the main bus to protect against inadvertent contact with main or vertical bus bars. 13. Provide in the cell when the circuit breaker is withdrawn, a safety shutter which automatically covers the line and load stabs and protects against incidental contact. 14. Provide a metal barrier full height and depth between adjacent vertical structures in the cable compartment. 15. Provide a glass polyester full height and depth barrier between adjacent vertical structures in the bus compartment with appropriate slots for main bus. C. Secondary Bus 1. The secondary LV bus bars shall be [silver-plated copper] [tin-plated copper]. Main horizontal bus bars shall be mounted with all three phases arranged in the same vertical plane. Bus sizing shall be based on ANSI standard temperature rise criteria of 65 degrees C over a 40 degrees C ambient (outside the enclosure). 2. Provide a full capacity neutral bus where a neutral bus is indicated on the drawings. 3. A copper ground bus shall be furnished firmly secured to each vertical section structure and shall extend the entire length of the switchgear. The ground bus short-time withstand rating shall meet that of the largest circuit breaker within the assembly. 4. All hardware used on conductors shall be high-tensile strength and zinc-plated. All bus joints shall be provided with Belleville-type washers. Note to Spec. Writer Optional 16311A-13 02/20/13

D. Wiring/Terminations INTEGRATED UNIT SUBSTATIONS (IUS) SECONDARY LESS THAN 1000 V 1. Small wiring, necessary fuse blocks and terminal blocks within the switchgear shall be furnished as required. Control components mounted within the assembly shall be suitably marked for identification corresponding to the appropriate designations on manufacturer s wiring diagrams. 2. Provide a front accessible, isolated vertical wireway for routing of factory and field wiring. Factory provisions shall be made for securing field wiring without the need for adhesive wire anchors. 3. Front access to all circuit breaker secondary connection points shall be provided for ease of troubleshooting and connection to external field connections without the need of removing the circuit breaker for access. 4. All control wire shall be type SIS. Control wiring shall be [16 ] [14 ] gauge for control circuits and [14 ] [12 ] gauge for current transformer circuits. Wire bundles shall be secured with nylon ties and anchored to the assembly with the use of pre-punched wire lances or nylon non-adhesive anchors. All current transformer secondary leads shall first be connected to conveniently accessible shorting terminal blocks before connecting to any other device. Shorting screws with provisions for storage shall be provided. All groups of control wires leaving the switchgear shall be provided with terminal blocks with suitable numbering strips and provisions for #10 AWG field connections. Each control wire shall be marked to the origin zone/wire name/destination zone over the entire length of the wire using a cured ink process. [Provide wire markers at each end of all control wiring]. Plug-in terminal blocks shall be provided for all shipping split wires. Terminal connections to remote devices or sources shall be front accessible via doors above each circuit breaker. 5. NEMA 2-hole [mechanical-] [crimp-] type lugs shall be provided for all line and load terminations where applicable, suitable for copper or aluminum cable rated for 75 degrees C of the size indicated on the drawings. 6. Lugs shall be provided in the incoming line section for connection of the main grounding conductor. Additional lugs for connection of other grounding conductors shall be provided as indicated on the drawings. 7. Reusable insulating boots shall be provided to cover all power cable terminations. E. Secondary circuit breakers 1. All protective secondary devices shall be low voltage power circuit breakers, Eaton type Magnum DS or approved equal. All breakers shall be UL listed for application in their intended enclosures for 100% of their continuous ampere rating. 2. All secondary power circuit breakers shall be constructed and tested in accordance with ANSI C37.13, C37.16, C37.17, C37.50, UL 1066 and NEMA SG-3 standard. The breaker shall carry a UL label. 3. Secondary breakers shall be provided in drawout configuration. The 800, 1600, 2000 and 3200 ampere frame power circuit breakers shall be provided in the same physical frame size, while 4000, 5000 and 6000 ampere frame power circuit breakers shall be Note to Spec. Writer Optional 16311A-14 02/20/13

provided in a second physical frame size. Both physical frame sizes shall have a common height and depth. 4. Secondary power circuit breakers shall utilize a two-step stored-energy mechanism to charge the closing springs. The closing of the breaker contacts shall automatically charge the opening springs to ensure quick-break operation. 5. Secondary breakers shall be manually operated (MO) unless electrically operated (EO) is indicated on the drawings. 6. Electrically operated secondary breakers shall be complete with [120 VAC] [240 VAC] [24 VDC] [48 VDC] [125 VDC] motor operators. The charging time of the motor shall not exceed 6 seconds. 7. To facilitate lifting, the secondary power circuit breaker shall have integral handles on the side of the breaker. 8. The secondary power circuit breaker shall have a closing time of not more than 3 cycles. 9. The secondary breaker phase contacts shall have an easily accessible wear indicator to indicate contact erosion. 10. The secondary power circuit breaker shall have three windows in the front cover to clearly indicate any electrical accessories that are mounted in the breaker. The accessory shall have a label that will indicate its function and voltage. The accessories shall be plug and lock type and UL listed for easy field installation. They shall be modular in design and shall be common to all frame sizes and ratings. 11. The secondary breaker control interface shall have color-coded visual indicators to indicate contact open or closed positions, as well as mechanism charged and discharged positions. Manual control pushbuttons on the breaker face shall be provided for opening and closing the breaker. The power circuit breaker shall have a Positive On feature. The breaker flag will read Closed if the contacts are welded and the breaker is tripped or opened. 12. The current sensors shall have a back cover window that will permit viewing the sensor rating on the back of the secondary breaker. A rating plug will offer indication of the rating on the front of the trip unit. 13. A position indicator shall be located on the faceplate of the secondary breaker. This indicator shall provide color indication of the breaker position in the cell. These positions shall be Connect (Red), Test (Yellow), and Disconnect (Green). The levering door shall be interlocked so that when the breaker is in the closed position, the breaker levering-in door shall not open. 14. Each secondary power circuit breaker shall offer a minimum of sixty (60) front-mounted dedicated control wiring points. Each wiring point shall have finger safe contacts, which will accommodate #10 AWG maximum field connections with ring tongue or spade terminals or bare wire. 16311A-15 02/20/13

*Note to Spec. Writer: Digitrip RMS trip units are available in four (4) models: Digitrip RMS 520 Basic protection select Paragraph 2.07 A through I. Digitrip RMS 520M Basic protection with local current metering, select Paragraph 2.07 A through K. Digitrip RMS 520MC Basic protection with local current metering and remote communications, select Paragraph 2.07 A through L, and X. Digitrip RMS 1150+ Advanced protection, metering, LED display and remote communications, select Paragraph 2.07 A through E, H through J, and L through X. F. SECONDARY TRIP UNITS 1. Each secondary low voltage power circuit breaker shall be equipped with a solid-state tripping system consisting of three current sensors, microprocessor-based trip device and flux-transfer shunt trip. Current sensors shall provide operation and signal function. The trip unit shall use microprocessor-based technology to provide the basic adjustable time-current protection functions. True RMS sensing circuit protection shall be achieved by analyzing the secondary current signals received from the circuit breaker current sensors and initiating trip signals to the circuit breaker trip actuators when predetermined trip levels and time delay settings are reached. Interchangeable current sensors with their associated rating plug shall establish the continuous trip rating of each circuit breaker. The trip unit shall be Eaton type Digitrip RMS [520] [520M] [520MC] [1150+]. 2. The secondary trip unit shall have an information system that utilizes battery backup LED s to indicate mode of trip following an automatic trip operation. The indication of the mode of trip shall be retained after an automatic trip. A reset button shall be provided to turn off the LED indication after an automatic trip. A test pushbutton shall energize a LED to indicate the battery status. 3. The secondary trip unit shall be provided with a display panel, including a representation of the time/current curve that will indicate the protection functions. The unit shall be continuously self-checking and provide a visual indication that the internal circuitry is being monitored and is fully operational. 4. The secondary trip unit shall be provided with a making-current release circuit. The circuit shall be armed for approximately two cycles after breaker closing and shall operate for all peak fault levels above 25 times the ampere value of the rating plug. 5. Secondary trip unit shall have selectable powered and unpowered thermal memory for enhanced circuit protection. 6. Complete system selective coordination shall be provided by the addition of the following individually adjustable time/current curve shaping solid-state elements: a. All circuit breakers shall have adjustments for long delay pickup and time 16311A-16 02/20/13

b. [Main] [Tie] [Feeders] [All circuit breakers] shall have individual adjustments for short delay pickup and time, and include I 2 t settings c. [Main] [Tie] [Feeders] [All circuit breakers] shall have an adjustable instantaneous pickup d. [Main] [Tie] [Feeders] [All circuit breakers] [Circuit breakers, where indicated on the drawings,] shall have individually adjustable ground fault current pickup and time, and include I 2 t settings or ground alarm only 7. The secondary trip unit shall have provisions for a single test kit to test each of the trip functions. 8. The Phase Short Delay time overcurrent and Ground time overcurrent protection functions shall be capable of being zone interlocked between two or more primary OR secondary trip units, to provide the fastest possible tripping for faults within the zone of protection of the primary OR secondary circuit breaker, and yet also provide positive coordination among all primary OR secondary circuit breakers in the system to limit power outage to only the affected part of the system. Zone Interlocking wiring shall be provided when indicated on the drawings or specified herein after in this specification. When Zone Interlocking is employed, a fault within the zone of protection in the primary OR secondary circuit breaker shall cause the appropriate primary OR secondary trip unit to simultaneously trip the affected primary OR secondary circuit breaker immediately, and send a signal to upstream primary OR secondary trip unit to restrain from tripping immediately. The restraining signal shall cause the upstream trip units to follow their set coordination times, so that the service is only minimally disrupted while the fault is cleared in the shortest possible time. Factory shall wire for zone interlocking for the power circuit breakers within the switchgear. 9. [Main] [Tie] [Feeders] [All secondary circuit breakers] [Secondary circuit breakers, where indicated on the drawings,] shall have individually adjustable ground fault alarm only. 10. [Except 520] The secondary trip unit shall have a 4-character LCD display showing phase, neutral, and ground current. The accuracy of these readings shall be +/- 2% of full scale. 11. [Only 520MC & 1150+] The secondary trip unit shall be equipped to permit communication via a network twisted pair for remote monitoring and control. 12. The secondary trip unit shall include a power/relay module which shall supply control to the readout display. Following an automatic trip operation of the circuit breaker, the trip unit shall maintain the cause of trip history and the mode of trip LED indication as long as its internal power supply is available. [except 520] An internal relay shall be programmable to provide contacts for remote ground alarm indication. 13. The secondary trip unit shall include a voltage transformer module, suitable for operation up to 600V, 50/60 Hz. The primary of the voltage transformer module shall be connected internally to the line side of the circuit breaker through a dielectric test disconnect plug. 14. [1150+ only] The display for the secondary trip units shall be a 24-character LED display. Note to Spec. Writer Optional 16311A-17 02/20/13

15. [1150+ only] Metering display accuracy of the complete system, including current sensors, auxiliary CTs, and the secondary trip unit, shall be +/- 1% of full scale for current values. Metering display accuracy of the complete system shall be +/- 2% of full scale for power and energy values. 16. [1150+ only] The secondary unit shall be capable of monitoring the following data: a. Instantaneous value of phase, neutral and ground current b. Instantaneous value of line-to-line voltage c. Minimum and maximum current values d. Watts, Vars, VA, Watt hours, Var hours and VA hours 17. [1150+ only] The energy-monitoring parameter values (peak demand, present demand, and energy consumption) shall be indicated in the secondary trip unit s alphanumeric display panel. 18. [1150+ only] The secondary trip unit shall display the following power quality values: crest factor, power factor, percent total harmonic distortion, and harmonic values of all phases through the 31st harmonic. 19. [1150+ only] An adjustable high load alarm shall be provided, adjustable from 50 to 100% of the long delay pickup setting. 20. [1150+ only] The secondary trip unit shall contain an integral test pushbutton. A keypad shall be provided to enable the user to select the values of test currents within a range of available settings. The protection functions shall not be affected during test operations. The breaker may be tested in the TRIP or NO TRIP test mode. 21. [1150+ only] Programming may be done via a keypad at the faceplate of the unit or via the communication network. 22. System coordination shall be provided by the following microprocessor-based programmable time-current curve shaping adjustments. The short-time pickup adjustment shall be dependant on the long delay setting. a. Programmable long-time setting b. Programmable long-time delay with selectable I 2 t or I 4 t curve shaping c. Programmable short-time setting d. Programmable short-time delay with selectable flat or I 2 t curve shaping, and zone selective interlocking e. Programmable instantaneous setting f. Programmable ground fault setting trip or ground fault setting alarm g. Programmable ground fault delay with selectable flat or I 2 t curve shaping and zone selective interlocking 23. [1150+ only] The secondary trip unit shall offer a three-event trip log that will store the trip data, and shall time and date stamp the event. 24. [1150+ only] The secondary trip unit shall have the following advanced features integral to the trip unit: a. Adjustable undervoltage release b. Adjustable overvoltage release c. Reverse load and fault current Note to Spec. Writer Select One 16311A-18 02/20/13

d. Reverse sequence voltage alarm e. Underfrequency f. Overfrequency g. Voltage phase unbalance and phase loss during current detection 25. [1150+ only] The secondary trip unit shall offer information on the circuit breaker s health. The data available shall include total number of all Instantaneous and Short Delay trips seen by the circuit breaker, an additional count of all the overloads and ground fault trips seen by the circuit breaker, an operation counter, a time stamp of the last breaker operation, and the maximum temperature seen by the trip unit. All these data points will be stored in non volatile memory and available for remote communications. 26. [520MC, 1150+] The secondary trip unit shall utilize ARMS Technology (Arc Flash Reduction Maintenance System). The ARMS Technology shall be provided in a system that shall reduce the trip unit Instantaneous pickup value when activated. The ARMS device shall not compromise breaker phase protection even when enabled. Once the ARMS unit is disabled, the recalibration of trip unit phase protection shall not be required. Activation and deactivation of the ARMS Technology trip setting shall be accomplished without opening the circuit breaker door and exposing operators to energized parts. The ARMS Technology shall provide a clearing time of 0.04 seconds, adjustable with a minimum of five settings ranging from 2.5X to 10X of the sensor value. 27. [520MC ARMS Technology shall be enabled via a switch on the trip unit and operation is indicated via a blue LED on the trip unit.] [1150+ ARMS Technology shall be enabled via programmable keypad on trip unit and operation is indicated via a flashing ARMS message on the display.] 28. The ARMS Technology shall be provided with remote enable/disable control.. 29. The ARMS Technology shall be provided with a switchgear panel mounted enable padlockable selector switch and indication via Blue LED pilot light. 30. The ARMS Technology shall be wired locally with interposing relays and wired to terminal blocks to enable a remote selector switch and confirmation light to be mounted a the downstream protected distribution equipment. 31. *Note to Spec. Writer: For remote enable/indication add in the downstream distribution equipment specification a requirement for a padlockable selector switch and Blue LED confirmation light. 2.05 CENTRAL DISPLAY UNIT A. Where indicated on the drawings, provide a central display unit capable of displaying information and data from trip units specified above. *Note to Spec. Writer: For centralized local monitoring of the Digitrip 520MC, Digitrip 1150+ and 1150(V) units, select BIM II from Section 16901, Paragraph 2.03 A Note to Spec. Writer Select One Note to Spec. Writer - Optional 16311A-19 02/20/13