RFI 2.pdf

Date: 8 September 2020

To: Mr. Stephen Shanks

Subject: ANSWERS TO RFI #002

Project: REPAIR ELECTRICAL DISTRIBUTION

Job #: SSL# 15227

ANG# FAKZ162003

From: David Donovan

1. Question: Contractor does not believe that 270 calendar days in a traditional work week will be enough to accomplish the scope of work. Will the contractor be allowed to work 7 days a week including holidays? Can the contractor include in their proposal a longer contract duration?

a. Answer: Refer to Addendum No. 2.

2. Question: On E 3.1, the detail for the directional bore says “2-inch conduit is installed only where cable tv conduit is required otherwise it is omitted.” On sheet E 2.1, the symbol “1WP/XX”. This symbol does not appear in the legend. Contractor assumes it is a 1-way 4” primary duct in a directional bore. Is the 2” Cable TV conduit in that duct?

a. Answer: No, the CATV is not in that duct. What that symbol means is that there is a 1-way 4 inch conduit and 0-way CATV/COM conduits. If you look on Sheet E2.1 on the east side of the site sheet note 15 shows the origin point of the CATV 2” conduit. It is routed under the perimeter road (Richardson Road) to a pull box on the base side of the fence. It is then routed/bored underground to another pull box adjacent to switch S102 indicated by the dashed line with the letter “C” in it. It then joins the bored duct from Switch S102 to switch S102A. You will notice that the duct has changed to 2WP/1C which means 2-way 4 inch duct and 1-way inch CATV duct. From S102A you just follow the duct around to behind bldg. 1202 where it branches off finally and is routed to the fire station. Periodically, the 2” conduit is separated and is routed through a junction box located adjacent to a piece of 15 kv gear.

3. Question: Will gear rated 12 5 KA gear with arc spinners be acceptable or will vacuum interrupters be required?

a. Answer: We would accept switches with arc spinners on this project

REPAIR ELECTRICAL DISTRIBUTION FAKZ162003

ANSWER TO RFI#002 Page 2 of 6 Seay Seay & Litchfield, P.C. 8 September 2020

4. Question: Will 15kV, 12 5 KA gear with Arc Spinners be acceptable? This would greatly reduce the overall price of the project and still exceed requirements of available fault current.

5. Question: On page 6 of the spec 26 0272, 2.6 Switched Ways, B it requires overcurrent sensing for single-phase or three phase tripping of the interrupter. With the Vista unit we have the ability to either do single phase or three phase tripping on the fault interrupter ways or a combination of the two depending on whether load needs single phase trip or three phase trip. On the drawing there appears to be some single phase and three phase transformers/buildings.

a. Answer: We would like three phase tripping on all three phase transformers and single-phase tripping on all single phase transformers.

6. Question: Can someone provide details on which ways will require 3 phase tripping and which ways will require single phase switching on each switch on drawing E5.01?

a. Answer: Question is construction means & methods. Coordinate switchgear and associated phase tripping with switch vendor as required to meet the intent of the design as clarified in the response to question #5 above.

7. Question: In addition, the specification 26 0272, Section 2.6 Switched ways, pages 5-

6 B Fault Interrupting Switched Ways and C Controls calls out auxiliary switches and contacts. Based on drawing E5.01, gear appears to be manual and not an automatic transfer switch. If this is truly manual gear, then we will not have any auxiliary switches, although switches can be configured from the factory with auxiliary contacts if they plan on needing status indication on a SCADA System in the future. It is extremely important to note that if aux contacts are required for possibility of future SCADA or status indication, then the switch is configured with aux contacts at time of ordering.

a. Answer: No SCADA requirements for this project. No auxiliary contacts will be required for any of the switched ways.

8. Question: Can you please verify confirm if aux contacts will be needed?

a. Answer: No auxiliary contacts required on any of the switched ways.

ANSWER TO RFI#002 Page 3 of 6 Seay Seay & Litchfield, P.C. 8 September 2020

9. Question: Switch S200A (utility Entry Switch) – It appears that the APCO service is coming in to Way 6 (fault interrupter way) and the Backup generator is coming into Way 5 (fault interrupter way); Is this reversed? Should the APCO service and the generator be coming into the switch ways and the fault interrupter ways be the feeders to the loop

a. Answer: Yes, that is correct. The fault interrupters 5 and 6 are reversed.

The interrupter ways should be reserved for the loop feed.

10. Question: Specific Specifications Questions/Observations Medium-Voltage, Pad Mounted Switchgear 26 0272. Section 1.2A page 1 – Calls for “remotely controlled” vacuum load and fault interrupting gear. Do I need to quote manual gear or remote?

According to drawing 5.1, all gear is manual. Remote gear with motor operators will double the price of the gear. Also, the load is broken by the load break switch and not the vacuum bottle.

a. Answer: No motor operators are required. All gear is manual.

11. Question: If I can supply gear at 12.5kA, may I supply fault interruption that is not vacuum bottle and in the form of Arc Spinners? This will greatly reduce the price of the gear and exceed electrical requirements of available fault current (3,490 amps)

a. Answer: We would accept switches with arc spinners on this project

12. Question: Specification section 23 0272, Section 1.3I page 2 – Calls for SCADA control. Do I need to quote manual gear with no remote control?

a. Answer: All gear is to be manual.

13. Question: Specification section 23 0272, Section 1.3F page 1 – does not dictate vacuum fault interrupter. May I supply fault interruptions that is not vacuum bottle and in the form of Arc Spinners?

14. Question: Section 1.4B.10 page 2 Design Calculations (signed and sealed by PE;

Calculate requirements for selecting Seismic restraints. Do we need to get a quote from manufacturer to provide or will those calculations be performed by consulting engineering firm?

a. Answer: No seismic calculations are required for this project.

15. Question: 26 0272 page 3 1.5 C Seismic Qualification Certificates: S&C can provide a Static Seismic Certification report at no charge; Any dynamic Seismic Certifications/Reports will be the responsibility of others. Do you require dynamic Seismic Calculations, or will the Static Seismic Certification Reports suffice?

a. Answer: No seismic calculations are required for this project.

ANSWER TO RFI#002 Page 4 of 6 Seay Seay & Litchfield, P.C. 8 September 2020

16. Question: 26 0272 page 5, 2.5 Construction C page 5 Construct switchgear assembly with switched ways that have front-accessible terminations for cables entering below and with manual operating provisions with a lineman’s hotstick; Vista gear is not hotstick operated; operation is performed by inserting operating handle in operating disk and moving handle to open, close, or ground position. Is a operating handle in operating disk acceptable as opposed to hotstick?

a. Answer: Operating handle is acceptable/preferred.

17. Question: 26 0272 page 5, 2.5 This does not state option for Voltage Indication and Low Voltage Phasing; Would you like us to add this option?

a. Answer: If it is not stated do not provide.

18. Question: 26 0272 page 5, 2.6 Switched Ways A Source Switch Ways: Non-fused, hotstick operated, ganged vacuum load interrupter switches Section 2.6A – Load break is accomplished by switch blade and not vacuum bottle. Vista switch and fault interrupter ways are not hotstick operated; operation is performed by inserting operating handle in operating disk and moving handle to open, close, or ground position. Would the above be acceptable since not hotstick operated?

a. Answer: Yes, operating handle/disk is acceptable.

19. Question: Page 5 2.6 A2 1). With 24V dc motor operators to open or close the load interrupter; Will this gear be manual gear or does it need to be equipped with motor operators? Drawings all appear to be manually operated and no ATS/motor operators.

a. Answer: Remove reference to 24VDC motor operators.

20. Question: 26 0272 Page 6 B Fault Interrupter Switched Ways: Non fused, hotstick-operated, ganged vacuum fault interrupter switches, in series with a visible break disconnect. With internally mounted current transformers and electronic overcurrent sensing for single phase or three phase ganged tripping of the interrupter. Comply with IEEE C37.60 Vista gear is not hotstick operated; operation is performed by inserting operating handle in operating disk and moving handle to open, close, or ground position Manual Vista units have options for both single phase or three phase tripping of the interrupter but must be configured prior to ordering how many single phase and how many three phase ways are needed in for each of the 4 fault interrupter ways on the unit. We need clarification on each switch to know how many fault interrupter ways on each switch are needed for three phase tripping and how many are needed for single phase tripping?

a. Answer: Refer to response to questions 5, 6, and 16 above.

21. Question: 26 0272 Page 6 B 2. a, b, e If gear is manual configuration, these sections will not apply. Vista switch will not be motor operated and will be manual gear according to drawings on E5.1 unless instructed otherwise

a. Answer: Gear to be manual configuration.

ANSWER TO RFI#002 Page 5 of 6 Seay Seay & Litchfield, P.C. 8 September 2020

22. Question: 26 0272 Page 6-7 C. Controls According to drawings, gear appears to be manual configuration and not motor operated.

a. Answer: Gear to be manual configuration.

23. Question: Are auxiliary contacts required? If so, we will need to install on the front end if we anticipate ever adding to SCADA system down the road or if they want to see any type of switch position status down the road.

a. Answer: Auxiliary contacts not required. Refer also to responses to question #7 and #8 above.

24. Question: Page 7 Section 2.6D – Tripping capability starts at 14Amps or minimum

7E

a. Answer: This is acceptable.

25. Question: Page 7 Section 2.7 Power Supply Vista gear will be of a manual configuration and not require power supplies or automatic transfer options per drawings; Can we get positive confirmation that gear will be manual configuration?

a. Answer: Confirmed. Gear will be manual.

26. Question: Page 7 Section 2.8 Bushings This section calls for 600A on all ways. 600 amp bushings required if gear must be 16kA.

a. Answer: The load interrupter is rated at 600 amps the individual loads are switched via 200 amp fault interruptor switches. As far as the rating goes the available fault current is less than 4000 amps per sheet E5.1.

The contractor must use the appropriate fault current ratings to cover this available current at 12.5KV.

27. Question: Are the sectionalizing cabinets 200amp or 600 amp?

a. Answer: Sectionalizing cabinets will be required to be 600 amp.

28. Question: Page 7 Section 2.8 Bushings. This section calls to Supply a standoff bracket or parking stand for each bushing horizontally adjacent to each bushing Vista units are not equipped with parking stands; Vista unit will be configured with M3 option (600 bushing with studs in lieu of 200 amp bushing wells)

a. Answer: The M3 option for 600 amp busings with studs instead of the 200 amp bushing wells is acceptable

29. Question: Page 7 Section 2.9 Surge Arrestors – to be provided by others; Surge arresters will require to piggyback of the 600A T-body connection to the 600A switch ways

a. Answer: We are indifferent to who provides this equipment either the vendor or contractor. Surge arrestors meeting the requirement of the specification must be provided – no exceptions.

ANSWER TO RFI#002 Page 6 of 6 Seay Seay & Litchfield, P.C. 8 September 2020

30. Question: Page 8 2.11 Ground Sleeves (Box Pads) - to be provided by others

a. Answer: We are indifferent to who provides this equipment either the vendor or contractor. Ground sleeve (box pads) meeting the requirement of the specification must be provided – no exceptions.

31. Question: Part 3 Execution – Part 3 – to be performed by others. This will be the responsibility of the contractor

a. Answer: We are indifferent to who provides this, the vendor or contractor. Awarded Contractor to provide all plant, labor, and materials required to meet the requirements of the drawings and specifications.

32. Question: Page 11 Section 3.5 Field Quality Control - all testing to be performed by others. S&C can provide an adder to quote for a S&C Field Service Technician to conduct inspection and commissioning prior to energizing equipment in accordance with S&C test procedures and operating procedures for S&C manual Vista Units. Do I need to get a quote for a Field Service tech to come in and provide Commissioning checks and training?

a. Answer: Yes, please add to the specifications the requirement for a field check by a factory technician prior to energizing any/all primary switches.

33. Question: On sheet E-3.2, sectionalizing cabinets are shown with 200 amp junction points. The switches on the same circuit are required to have 600 amp junctions on the incoming and outgoing feeder. Should the sectionalizing cabinet terminations also be 600 amp rather than 200 amp?

a. Answer: The sectionalizing cabinets should be 600 amps and should match the switch interrupters for the main loop.

34. Question: On sheet E4.1, general note 3 indicates that Alabama Power will furnish the ground rods and copper ground wire. Is this correct?

a. Answer: This is incorrect. All ground rods and copper ground wire to be furnished and installed by the Contractor. Refer also to Addendum No.

2.

35. Question: Similar projects of this size at other locations have typically had 365 days for completion. 270 days is basically 180 days for on site work (Monday thru Friday). Can the completion time for this project be extended to 365 days in lieu of 270 days?

a. Answer: Refer to Addendum No. 2.

End of RFI Responses