2018 Consultant s Handbook Division 26 Electrical 2413 Switchboards

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1 1 General 1.1 Switchboards shall be U.L. listed and labeled. 1.2 Each switchboard shall have its own main disconnecting means unless it is located in the same room as its source of origin. In most cases this will be a main breaker, molded case switch or fusible switch. 1.3 In general, switchboards shall be located in electrical equipment rooms or other equipment rooms designed for such. 1.4 These rooms shall be accessible by qualified personnel only and have corresponding signage stating such. 1.5 Switchboards shall not be located in corridors or other areas of public access. 2 Approved Manufacturers 2.1 Siemens 2.2 Square D 2.3 G.E. 3 Enclosure 3.1 Dead front and totally enclosed construction, front access. 3.2 Constructed of #12 gauge minimum steel, reinforced with channels and angles as necessary. 3.3 Provided with space as shown for future branches, bussed and equipped for the addition of breakers or fusible switch units. 3.4 Provided with Kirk type interlock arrangements if needed. 3.5 Removable, hinged door arrangement and adequate means of access to equipment for inspection and servicing without removal from switchgear assembly. 3.6 Wiring troughs shall have removable, hinged access doors. 4 Branch Switches 4.1 "QMB" type branches - quick make/quick break spring-loaded type, actuated by lockable handle. 4.2 Side hinged fuse access panels only. 5 Circuit Breakers 5.1 All breakers (Main and Distribution) shall be fully rated. 5.2 Series connected rated systems are not acceptable. 5.3 Breakers shall have provisions for Lock-Out / Tag-Out, capable of accepting padlocks. 5.4 Breakers over 225 Amps shall have adjustable electronic trip units unless the AFC (Arc Flash Consultant) recommends otherwise Selectable settings required for arc fault mitigation are to be coordinated with the Arc Flash Hazard Analysis prior to project bid. 6 Construction 6.1 All bus bars to be plated copper of 98 percent conductivity. 6.2 All bus bars shall be braced for maximum short circuit protection. 6.3 All bus bar contacts and joints shall be plated. 6.4 Provide supported bus extension to bus duct connections, whether incoming service or outgoing feeders. Cable connections to bus duct from switches are not desired. 6.5 All distribution devices shall be group mounted. 6.6 Main bus location shall be as required to clear conduit access space in board, as well as aisle space on walkthrough boards. 6.7 The main section shall contain barriers, isolating it from the other sections of the switchboard. 6.8 Provide fiberglass Unistrut or equal cable supports in boards. 6.9 Provide copper bus bar pieces on switch load side for rear cable connection to lug, 600A size and above where applicable (main service switchboards only) Horizontal (thru) bus shall be fully sized, extended and pre-drilled to accommodate future switchboard sections with standard splice plates Blank compartments shall be bussed and equipped to accept future breakers Switchboards shall be equipped with rodent barriers Switchboards shall be equipped with Page 1 of 12

2 barriers separating the wiring gutters from the bus bars. Removable barriers are preferred over taped bus Exterior Switchboards In general shall be in NEMA 3R gasketed enclosure Where switchboard is located in a corrosive environment, enclosure shall be type NEMA 4X Shall be equipped with bottom closure plate Shall be equipped with rodent barriers Shall be equipped with strip heaters with wiring labeled and extended out to terminal blocks The strip heaters shall have a dedicated power supply Doors shall be hinged and padlockable 7 Miscellaneous 7.1 Provide engraved plastic one-line diagram on each board. 7.2 Provide an engraved plastic label on the front of the switchboard indicating the nominal CT ratio and PT ratio. 7.3 Provide a minimum 1/4" x 2" size cross sectional area copper equipment grounding bus in each switchboard and connect grounding bushings of feeder conduits. 7.4 Allow 3'-0" minimum clearance in rear of rear access boards. 7.5 Allow 4'-0" minimum clearance in front of all boards. 8 Isolation Circuit Breaker (ICB) 8.1 Located between the utility transformer secondary and the Main Service Switchboard. 8.2 Adheres to all Main Service Switchboard guidelines. 8.3 To have maintenance mode only where indicated by the Arc Flash study Maintenance mode will be indicated by a blue LED on the Isolation Circuit Breaker switchboard Maintenance mode will be selected by a keyed switch on the Isolation Circuit Breaker switchboard. The keyed switch positions are to be clearly labeled Maintenance Mode and Normal respectively. 8.4 To be remote operation (see Typical Remote Pushbutton Enclosure Detail on page 6) Operation unit to be installed in lockable enclosure capable of accepting a padlock with a 3/8 dia. hasp (for lock-out tag-out purposes) Lockable enclosure to have breaker status indicator lights Indicator lights to indicate closed and open status and be labeled accordingly. Indicator lights to be red and green respectively Indicator for Maintenance Mode (when used) to be blue Lockable enclosure to contain pushbuttons for remote circuit breaker operation Green pushbutton operation to cause the circuit breaker to open and be labeled accordingly. Red pushbutton operation to cause the circuit breaker to close and be labeled accordingly Lockable enclosure to contain keyed selector switch for Maintenance Mode operation. The keyed switch positions are to be clearly labeled Maintenance Mode and Normal respectively 9 Main Service Switchboards (MDP) 9.1 Freestanding NEMA Class I to and including 2000A. 20" maximum depth 9.2 Freestanding NEMA Class II or Class III over 2000A. 32" minimum depth for front access 48" minimum depth for side or rear access 9.3 Provide special provisions for bus duct connections where the bus duct enters the switchgear Page 2 of 12

3 9.4 50,000A minimum "withstand" bracing and components. 9.5 Provide surge protection device (SPD) Remotely mounted on top of the MDP flush with the front of the switchgear in order to minimize lead lengths Feed from a dedicated branch circuit breaker located as close as possible to the SPD 9.6 Provide provision for grounding each phase bus bar to the ground bus. This shall be accomplished via a ball stud and socket clamp grounding system Provide with one set of grounding cables with four socket clamps Provide cabinet or means for storing the grounding cables in the same room as the switchboard equipped with the ground studs. 10 Sub distribution Switchboards (SDP) 10.1 Freestanding NEMA Class I to and including 2000A. 20" maximum depth ,000A minimum "withstand" bracing and components. 11 Provide Electronic Power Monitoring and Control 11.1 Refer to Division 26 Section 0913 of these guidelines. 12 Other Instrumentation, Control Power and Power Supplies 12.1 Any control power and power supplies shall be in a compartment isolated from any energized bus The compartment shall also contain a disconnect switch to disconnect power to the applicable components All components in the compartment shall have guarding in place to be considered fingersafe with respect to voltage above 50 volts All control wiring for switchboard and circuit breakers shall be wired to an accessible terminal strip in an isolated compartment within the switchgear. Both ends of the wiring shall be properly labeled. 13 Warranty 13.1 Warranty shall be the standard factory warranty from the date of purchase or from installation and shall include all parts, labor, travel and other expenses The Engineer of Record shall investigate pricing for an extended warranty and make recommendations to the owner. 14 Documentation 14.1 In addition to the standard Owner s Manual requirements, the project specifications shall require that a separate electronic copy (in PDF format), of the certified factory drawings shall be sent to the University Senior Electrical Engineer and to the Arc Flash Consultant. 15 Submittals 15.1 Coordination Meeting: The Electrical Contractor and Manufacturer s Representative shall schedule a review meeting with the Owner, Engineer of Record, and Arc Flash Consultant prior to officially submitting product data and shop drawings via the submittal process. The intent of the meeting will be to discuss and review products and shop drawings to demonstrate compliance with the project requirements and Purdue standards Product Data: For each type of switchboard, overcurrent protective device, metering device, accessory, and component indicated include dimensions and manufacturers technical data on features, performance, electrical characteristics, ratings (including C.T. and P.T. ratios), accessories, and finishes Also include the product data requested in the Switchboard Application Data Sheets, Branch Circuit Breaker Application Data Sheets, and Branch Fusible Switch Application Data Sheets Uncompleted Application Data Sheet forms may be requested from the University Senior Electrical Engineer to be returned to the same. 16 Shop Drawings 16.1 Review Meeting: The Electrical Contractor and Manufacturer s Representative shall Page 3 of 12

4 schedule a review meeting with the Owner and Engineer of Record prior to releasing the shop drawings for manufacture The intent of the meeting will be to review the shop drawings for compliance with the project requirements and Purdue standards The shop drawings shall be completely detailed and include an itemized Bill of Material The following parties shall be invited: Contractor Equipment Manufacturer s Representative Purdue Project Manager Purdue Project Engineer Purdue Senior Electrical Engineer Purdue Electrical Observer (if applicable) Arc Flash Consultant A/E Engineer of Record 16.2 Deliverables for each switchboard and related equipment shall include: Dimensioned plans Elevations Sections Details, including required clearances and service space around equipment. Tabulations of installed devices equipment features, and ratings (including C.T. and P.T. ratios) Detail incoming busway into the switchboard Note type of feeder and show feeder entrance into switchboard (top or bottom fed, switchboard section number, cable or bus) Detail bus configuration, current, and voltage ratings Detail short-circuit current rating of switchboard and overcurrent protective devices Detail illustrating additional gutter space requirements for distribution sections Detail metering equipment, accessories, connections and wiring diagrams Detail features, characteristics, ratings, and factory settings of individual overcurrent protective devices and auxiliary components List adjustable circuit breaker setting types 16.9 Include time-current coordination curves for each type and rating of overcurrent protective device included in switchboards. Submittal shall also include a list of each overcurrent device provided indicating all upstream and downstream devices that will coordinate with the provided devices Include schematic and wiring diagrams for all power, signal, and control wiring within the switchboard enclosure Detail grounding balls and associated bus when grounding balls are specified Detail the wiring diagram for the motorized remote operated circuit breaker when the motorized remote operated circuit breaker is specified. Page 4 of 12

5 17 Typical Remote PB Enclosure Page 5 of 12

6 18 Application Data Sheet for Switchboards Application Data Sheet for Switchboards Project Name: Item No. Item Description General 1 Vendor Name 2 Name & Location of Manufacturing Plant Incoming Service 3 Incoming Service Voltage 3a Phase 3b Wire 4 Mains (MLO or MCB) 4a Mains Rating (Amperage) 5 Neutral (Full or Half) 6 Service Entrance Equipment Rated (Yes or No) If 6 No, is the equipment protected by class L fuses ahead of this equipment or is it protected by circuit breaker ahead of this 6a equipment 7 Short Circuit Withstand Rating (Bus Bracing) 7a Lowest AIC of Installed Device Fully Rated (Yes or No) 7b Acceptable 8 Incoming Feed (Top, Bottom, Left, or Right) Series Rated Not 9 Underground Pull Section (None required, Non-bussed, or Bussed) 10 Incoming (Cables or Busway) 10a If 10 is Cables, Type of Lugs (Standard Mechanical, Compression, or Limiter) 10a.i 10a.ii If 10a is Limiter Lugs, Phase Quantity & Size If 10a is Limiter Lugs Neutral Quantity & Size 10a.iii If 10a is Limiter Lugs or Compression Lugs by Others, List Manufacturer & Catalog No. Page 6 of 12

7 10b 10b.i If 10 is Busway, List Manufacturer and Catalog No. If 10 is Busway, List Current Rating 10.b.ii If 10 is Busway, List Short Circuit Rating Switchboard Construction 11 Enclosure Type (Indoor, Outdoor, NEMA/IEC Rating) 12 Construction (Rear Connected, Front Connected) 13 Construction Notes (Customer has Access to: Front Only, Front & Rear, Rear Only, Side, Left, or Right) 14 Paint (ANSI 61 Light Grey Standard, Indoor, Outdoor, or Other) 15 Type of Bus (Tin Plate Copper, Silver Plated Copper) 16 Ampere Rating of Through Bus 16a Type of Bus (Non-Tapered, Fully Bussed) Bus Cross Section Based On: (65 C Rise Over 40 Ambient, or 16b 50 C Rise Over 40 Ambient) 17 Lifting Eyes (Yes or No) 18 Shipping Splits (Factory Choice or Single Sections) Metering 19 Meter Provided (Yes or No) 19a If 21 Yes, List Meter Manufacturer 19b If 21 Yes, List Meter Model No. 19c Installation Configuration (Hot or Cold Sequence) 20 Metering Compartment Provided (Yes or No) 21 CTs Provided (Yes or No) 21a CT Manufacturer 21b CT Model Number 21c CT Ratio 21d CT ANSI Accuracy and Burden Class 21e CT RF at 30 C 21f CT RF at 55 C Page 7 of 12

8 Main Disconnects 22 Main Circuit Breaker (Yes or No) 22a If 22 Yes, Type (Molded Case - Thermal Magnetic Trip, Molded Case - Solid State Trip, Insulated Case - Solid State Trip, Low Voltage Power Breaker - Solid State Trip, Adjustable Trip) 22a.i If 22a Low Voltage Power Breaker - Solid State Trip, List Frame Catalog No., Ampere Rating, and Trip Rating 22a.ii If 22a Adjustable Trip Settings, List Trip Unit Catalog No. 22b If 22 Yes, Manually or Electrically Operated 22b.i If 22b Electrically Operated, is the control wiring run to an accessible terminal strip in an isolated compartment (Yes or No) 22c 22d 22e 22f 22f.i 22.f.i If 22 Yes, Stationary, Drawout, or Plug-In If 22 Yes, Solid-State Catalog No. Breaker Auxiliary Contacts (52a) Maintenance Mode (Yes or No) If 22f Yes, is there a blue LED indicator light on the gear (Yes or No) or No) If 22f Yes, is there a keyed selector switch on the gear (Yes 23 GFI Protection for Main Disconnect (Yes or No) 23a If 23 Yes, Type (Internal or External) 23a.i 23a.ii If 23a is External, is there a Stationary Relay & Monitor Panel with Test Function (Yes or No) No) If 23a Is External, is there a Zone Selective Interlock (Yes or 23a.iii 23b 23c If 23a.ii is Yes, what is it Interlocked With If 23 Yes, is Ground Fault Protection Ahead of this Equipment (Yes or No) No) If 23 Yes, is Feeder Ground Fault Protection Required (Yes or Page 8 of 12

9 23c.i If 26c Yes, How Many Feeder Circuits 24 Shunt Trip for Remote Tripping (Yes or No) 24a If 24 Yes, Power Provided by Manufacturer or Other 24b If 24 Yes, List Voltage Required 25 Kirk Key Interlock (Yes or No) 25a If 25 Yes, Coordination Required with Other Locks (Yes or No) 26 Tie Circuit Breaker (Yes or No) If 26 Yes, Same Manufacturer and Model Number as Main 26a Circuit Breaker (Yes or No) 27 Main Fusible Switch (Yes or No) 27a 27b 27c T) If 27 Yes, Switch Type (BP Switch, VB Switch, Other) If 27 Yes, Switch Amperage Rating If 27 Yes, Fuse Type (Class L, Class J, Class RKI, Class RK5, Class 27d If 27 Yes, Fuses to be Furnished by (Manufacturer or Others) 27e If 27 Yes, Fuse Amperage Rating 28 Service Surge Protection Device Type 28a Mounting (Internal or External) Branch Circuits Have you completed and submitted the Branch Circuit Breaker and 29 Branch Fusible Switch Application Data Sheets? Other Options and Modifications 30 Mimic Bus Color (Black or Specify Other) 31 Tape Wrapped Bus, Excluding Joints (Yes or No) 32 Compartmentalization (Yes or No) 32a If 32 Yes, Main Only or Main and Branches 33 Heaters (Yes or No) 33a If 33 Yes, Control Power by Manufacturer or Others 33b If 33 Yes, Controls (Humidistat or Thermostat) Page 9 of 12

10 Show Location of Labeling on Shop Drawings. The following Special Labeling is Required: CT Ratio CT ANSI Accuracy and Burden Class 34 CT RF at 30 C or 55 C 35 Ground Bus Size 36 Ground Bus Location 37 Ground Bus Material 38 Barriers Between Sections (Yes or No) 39 Barriers in Wiring Gutters (Yes or No) 40 All breakers equipped with a lockout device to accept a padlock for LOTO (Yes or No) In general, items and descriptions apply to all 3 phases unless otherwise noted. Page 10 of 12

11 19 Application Data Sheet for Branch Circuit Breakers Application Data Sheet for Branch Circuit Breakers Project Circuit Breaker Name: Designation: Item No. Item Description 1 Type (Molded Case - Thermal Magnetic Trip, Molded Case - Solid State Trip, Insulated Case - Solid State Trip, Low Voltage Power Breaker - Solid State Trip, Adjustable Trip) 1a If 1 Low Voltage Power Breaker - Solid State Trip, List Frame Catalog No., Ampere Rating, and Trip Rating 1b If 1 Adjustable Trip Settings, List Trip Unit Catalog No. 2 Manually or Electrically Operated 2a If 2 Electrically Operated, is the control wiring run to an accessible terminal strip in an isolated compartment (Yes or No) 3 Stationary, Drawout, or Plug-In 4 Solid-State Catalog No. 5 GFI Protection for Main Disconnect (Yes or No) 5a 5a.i 5a.ii 5a.iii If 5 Yes, Type (Internal or External) If 5a is External, is there a Stationary Relay & Monitor Panel with Test Function (Yes or No) If 5a Is External, is there a Zone Selective Interlock (Yes or No) If 5a.ii is Yes, what is it Interlocked With 5b If 5 Yes, is Ground Fault Protection Ahead of this Equipment (Yes or No) 6 Shunt Trip for Remote Tripping (Yes or No) 6a 6b If 6 Yes, Power Provided by Manufacturer or Other If 6 Yes, List Voltage Required 7 Kirk Key Interlock (Yes or No) 7a If 7 Yes, Coordination Required with Other Locks (Yes or No) 8 Breaker Auxiliary Contacts (52a) 9 All breakers equipped with a lockout device to accept a padlock for LOTO (Yes or No) Page 11 of 12

12 20 Application Data Sheet for Branch Fusible Switches Application Data Sheet for Branch Fusible Switches Project Name: Fusible Switch Designation: Item No. Item Description 1 Switch Type (BP Switch, VB Switch, Other) 2 Switch Amperage Rating 3 Fuse Type (Class L, Class J, Class RKI, Class RK5, Class T) Fuses to be Furnished by (Manufacturer 4 or Others) 5 Fuse Amperage Rating Page 12 of 12

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