ADDENDUM NO. 1 BID AND CONTRACT DOCUMENTS FOR. BID No. 2019PW299

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1 ADDENDUM NO. 1 BID AND CONTRACT DOCUMENTS FOR BID No. 2019PW299 CHAFFEY COMMUNITY COLLEGE DISTRICT TRANSFORMER REPLACEMENT PROJECT RANCHO CUCAMONGA, CALIFORNIA COUNTY OF SAN BERNARDINO CHAFFEY COMMUNITY COLLEGE DISTRICT 5885 Haven Avenue Rancho Cucamonga, CA Official Copy for Bidding 1 of 4 Addendum No. 1, November 28, 2018

2 The following changes, additions, deletions, clarifications, or corrections shall become part of the Bid and Contract Documents for Chaffey Community College District Bid No. 2019PW299, Transformer Replacement Project at the Chaffey College, Rancho Cucamonga Campus, first advertised October 29, All other terms, specifications, and conditions remain the same. Each bidder is responsible for transmitting this information to all affected subcontractors and suppliers prior to the opening of bids. Each bidder shall acknowledge receipt of this Addendum on its Bid Form. Modifications are identified by clouds and the following: Deletions strikethrough Insertions/Substitutions italic-underlined. ITEM No. 1; ADD the CONTRACTORS QUESTIONS & ANSWERS (November 28, 2018) Item No. AD-1.1 / RFC #2019PW299-1 Section 8-Siemens Acknowledgement: Can we use other manufacturer for the two oilfilled transformers and one Switchboard (Wargin Hall)? Direction from DISTRICT was to use Eaton transformers (as at Theatre which is to become the campus standard for liquid filled transformers). Item No. AD-1.1 / RFC #2019PW299-2 In Wargin Hall, contractor should install a new Switchboard WH. Can you provide Spec.? See attached Specification Section SWITCHBOARDS. Item No. AD-1.1 / RFC #2019PW299-3 Contract Appendix Sub Part B Supplementary General Condition: Please advise regarding construction completion time. The completion time is within 30 Calendar days but it may shorter than normal oil-filled transformer lead time. Construction time will be 30 days after equipment is received. Official Copy for Bidding 2 of 4 Addendum No. 1, November 28, 2018

3 Item No. AD-1.1 / RFC #2019PW299-4 Point of de-energize for (E) 12kV feeders at both sites: Please provide 12kV single line diagram to find out where contractor can de-energize the 12KV feeder to replace transformer. Also, do the 12kV feeders at both site have individual disconnecting means? Coordinate with DISTRICT electrician prior to project commencing. Item No. AD-1.2 / RFC #2019PW299-5 Is an Inspector office trailer-minimum 400sq ft and powered and with AC-Heat and telephone line for FAX machine required? Is a Computer screen and printer required? No, neither of these are required. Item No. AD-1.2 / RFC #2019PW299-6 What equipment is to be retained by College in regards to both Transformers and switchboard in Wargin Hall? What are the recycling plans of the college? The DISTRICT will not retain any equipment, this is the contractor s responsibility. Recycling is the responsibility of the contractor. Item No. AD-1.2 / RFC #2019PW299-7 Can Okonite or Pirelli Medium Voltage cable be EPR insulation and with PVC jacket? and not URD jacket? XLPE was specified, not URD, however, EPR is acceptable. Official Copy for Bidding 3 of 4 Addendum No. 1, November 28, 2018

4 Item No. AD-1.2 / RFC #2019PW299-8 It was mentioned by another contractor on the job walk that the vault by Maintenance Operation had 3-point 200A loadbreak junctions which were not visible during job walk and also mentioned that Wargin Hall vault was likely to be a straight splice on all 3 conductors to OFC switches in Wargin Hall electric room. My question is to you what type of splice or connection would be owner specified? Since existing MV cable will need to be tested prior to splice and also the new MV cable with terminations installed. We could set up another loadbreak 200A elbows with 2-point junction inside the vault for servicing. Is this preferred? For bidding purposes include separable splices in the bid. The intent is for the successful contractor to duplicate the existing splicing technique within the structures. ITEM No. 2; CONTRACT DOCUMENTS 1. ADD new Specification: SECTION SWITCHBOARDS is attached to this Addendum. END OF ADDENDUM NO. 1 INCLUDING REFERENCED ENCLOSURES Enclosures: 1. New Contract Document Issued: a. Section Switchboards (6 pages). END OF ADDENDUM NO. 1 Official Copy for Bidding 4 of 4 Addendum No. 1, November 28, 2018

5 SECTION SWITCHBOARDS PART 1 - GENERAL 1.1 SUMMARY A. Section includes distribution switchboards. B. Related Sections: 1. Section Grounding and Bonding for Electrical Systems. 2. Section Identification for Electrical Systems. 1.2 REFERENCES A. American National Standards Institute: 1. ANSI C Code for Electricity Metering. 2. ANSI C Requirements, Electrical Analog Indicating Instruments. B. Institute of Electrical and Electronics Engineers: 1. IEEE C Standard Requirements for Instrument Transformers. 2. IEEE C Recommended Practice on Surge Voltages in Low-Voltage AC Power Circuits. C. National Electrical Manufacturers Association: 1. NEMA KS 1 - Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts Maximum). 2. NEMA PB 2 - Deadfront Distribution Switchboards. 3. NEMA PB General Instructions for Proper Handling, Installation, Operation, and Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or Less. D. International Electrical Testing Association: 1. NETA ATS - Acceptance Testing Specifications for Electrical Power Distribution Equipment and Systems. E. Underwriters Laboratories Inc.: 1. UL Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures. 2. UL Dead-Front Switchboards. 1.3 SUBMITTALS A. Section Submittal Procedures: Submittal procedures. B. Shop Drawings: Indicate front and side views of enclosures with overall dimensions shown; conduit entrance locations and requirements; nameplate legends; size and number of bus bars for each phase, neutral, and ground; and switchboard instrument details. C. Product Data: Submit electrical characteristics including voltage, frame size and trip ratings, fault current withstand ratings, and time-current curves of equipment and components. Switchboards

6 D. Test Reports: Indicate results of factory production and field tests. 1.4 CLOSEOUT SUBMITTALS A. Section Execution and Closeout Requirements: Closeout procedures. B. Project Record Documents: Record actual locations, configurations, and ratings of switchboards and their components on single line diagrams and plan layouts. C. Operation and Maintenance Data: Submit spare parts data listing; source and current prices of replacement parts and supplies; and recommended maintenance procedures and intervals. 1.5 QUALIFICATIONS A. Manufacturer: Company specializing in manufacturing products specified in this section with minimum three years experience. B. Manufacturer of switchboard enclosure shall be the same as the overcurrent protective devices. 1.6 DELIVERY, STORAGE, AND HANDLING A. Section Product Requirements: Requirements for transporting, handling, storing, and protecting products. B. Deliver in 48 inch maximum width shipping splits, individually wrapped for protection and mounted on shipping skids. C. Accept switchboards on site. Inspect for damage. D. Store in clean, dry space. Maintain factory wrapping or provide additional canvas or plastic cover to protect units from dirt, water, construction debris, and traffic. E. Handle in accordance with NEMA PB 2.1. Lift only with lugs provided. Handle carefully to avoid damage to switchboard internal components, enclosure, and finish. 1.7 ENVIRONMENTAL REQUIREMENTS A. Section Product Requirements. B. Conform to NEMA PB 2 service conditions during and after installation of switchboards. 1.8 FIELD MEASUREMENTS A. Verify field measurements prior to fabrication. 1.9 SEQUENCING A. Section Summary: Work sequence. Switchboards

7 B. Sequence Work to avoid interferences with building finishes and installation of other products MAINTENANCE MATERIALS A. Section Execution and Closeout Requirements: Spare parts and maintenance products EXTRA MATERIALS A. Section Execution and Closeout Requirements: Spare parts and maintenance products. PART 2 - PRODUCTS 2.1 DISTRIBUTION SWITCHBOARDS A. Manufacturers: 1. Eaton. 2. Siemens. 3. Substitutions: Section Product Requirements. B. Product Description: NEMA PB 2, enclosed switchboard with electrical ratings and configurations as indicated on Drawings. C. Device Mounting: 1. Distribution Section: Group mounted. 2. Auxiliary Section: Group mounted. D. Bus: 1. Material: Copper, standard size. 2. Connections: Bolted, accessible from front for maintenance. 3. Insulation: Non-insulated. E. Ground Bus: Extend length of switchboard. F. Minimum Short Circuit Rating: 65,000 symmetrical amperes rms, fully rated, or as indicated. G. Line and Load Terminations: Accessible from front only of switchboard, suitable for conductor materials and sizes as indicated on Drawings. H. Pull Box: Removable front and sides, same construction as switchboard, size as indicated on Drawings. I. Future Provisions: Fully equip spaces for future devices with bussing and bus connections, insulated and braced for short circuit currents. Furnish continuous current rating as indicated on Drawings. J. Enclosure: NEMA Type 1 - General Purpose. K. Switchboard Height: 90 inches, excluding floor sills, lifting members and pull boxes. Switchboards

8 L. Finish: Manufacturer's standard light gray enamel over external surfaces. Coat internal surfaces with minimum one coat corrosion-resisting paint, or plate with cadmium or zinc. 2.2 MOLDED CASE CIRCUIT BREAKER A. Manufacturers: 1. Eaton. 2. Schneider Electric. 3. Siemens. 4. Substitutions: Not Permitted. 5. To be same manufacturer as enclosure. B. Product Description: UL 489, molded-case circuit breaker. C. Field-Adjustable Trip Circuit Breaker: Circuit breakers with frame sizes 200 amperes and larger have mechanism for adjusting continuous current setting for automatic operation. Range of Adjustment: amperes. D. Field-Changeable Ampere Rating Circuit Breaker: Circuit breakers with frame sizes 200 amperes and larger have changeable trip units. E. Solid-State Circuit Breaker: Electronic sensing, timing, and tripping circuits for adjustable current settings; ground fault trip with zero sequence type ground fault sensor; instantaneous trip; and adjustable short time trip. F. Provide each circuit breaker with a padlockable lock-off device. 2.3 GROUND FAULT DEVICES A. Manufacturers: 1. Eaton. 2. Siemens. 3. Substitutions: Not Permitted. B. Ground Fault Sensor: Zero sequence type. C. Ground Fault Relay: Adjustable ground fault sensitivity from 200 to 1200 amperes, time delay adjustable from 0 to 15 seconds. Furnish monitor panel with lamp to indicate relay operation, TEST and RESET control switches. Must be able to test without tripping circuit breaker. 2.4 POWER METERS A. Manufacturers: 1. Siemens. 2. Eaton. 3. Schneider Electric. 4. Shark. 5. Substitutions: Section Product Requirements. B. Watt-hour Meters and Wattmeters: ANSI C12.1; three phase induction type with two stators, each with current and potential coil, rated 5 amperes and 120 volts at 60 Hertz. Meter suitable for connection to 3- and 4-wire circuits. Furnish potential indicating lamps; adjustments for light Switchboards

9 and full load, phase balance, and power factor; four-dial clock register; integral demand indicator; ratchets to prevent reverse rotation; removable meter with draw-out test plug; semiflush mounted case with matching cover. C. Furnish meters with appropriate multiplier tags. 2.5 METERING TRANSFORMERS A. Manufacturers: 1. Generac. 2. Schneider Electric. 3. Ronk Electric Industries. 4. Substitutions: Section Product Requirements. B. Current Transformers: IEEE C57.13; 5 ampere secondary, window type, with single secondary winding and secondary shorting device, primary/secondary ratio, burden and accuracy consistent with connected metering and relay devices, 60 Hertz. C. Potential Transformers: IEEE C57.13; 120 volt single secondary, disconnecting type with integral fuse mountings, primary/secondary ratio as indicated on Drawings, burden and accuracy consistent with connected metering and relay devices, 60 Hertz. 2.6 SOURCE QUALITY CONTROL A. Furnish shop inspection and testing in accordance with NEMA PB 2. B. Make completed switchboard available for inspection at manufacturer's factory prior to packaging for shipment. Notify Owner at least seven days before inspection is allowed. C. Allow witnessing of factory inspections and tests at manufacturer's test facility. Notify Architect at least seven days before inspections and tests are scheduled. PART 3 - EXECUTION 3.1 EXAMINATION A. Section Administrative Requirements: Coordination and project conditions. B. Verify surface is suitable for switchboard installation. 3.2 EXISTING WORK A. Disconnect and remove abandoned switchboards. B. Maintain access to existing switchboards and other installations remaining active. 3.3 INSTALLATION A. Install in accordance with NEMA PB 2.1. Switchboards

10 B. Tighten accessible bus connections and mechanical fasteners after placing switchboard. C. Install engraved plastic nameplates in accordance with Section D. Ground and bond switchboards in accordance with Section FIELD QUALITY CONTROL A. Section Quality Requirements Execution and Closeout Requirements: Field inspecting, testing, adjusting, and balancing. B. Inspect and test in accordance with NETA ATS, except Section 4. C. Perform inspections and tests listed in NETA ATS, Section ADJUSTING A. Section Execution and Closeout Requirements: Testing, adjusting, and balancing. B. Adjust operating mechanisms for free mechanical movement. C. Tighten bolted bus connections. D. Adjust circuit breaker trip and time delay settings to values as indicated on Drawings. 3.6 CLEANING A. Section Execution and Closeout Requirements: Final cleaning. B. Touch up scratched or marred surfaces to match original finish. END OF SECTION Switchboards