Q&A,_11_July_2018.pdf

1. There are some keynotes that don´t appear in the draws. For example, keynotes 7 and 8 in draw AD102 and keynotes 6, 8 and 9 in draw A-111. Does this means that it´s not supposed to do?

A: Sheet AD102, keynote 7 states “NOT USED”, keynote 8 refers to an add alternate for deck removal and replacement but shall be ignored since it will not to be used in this contract. Sheet A-111, keynote 6 will replace keynote 5 on this sheet, keynote 5 will be “NOT USED”. Keynote 8 is used on sheet A- 403, not referenced in plan on sheet A-111. Keynote 9 shall be “NOT USED”, eliminated from scope.

2. What are the powers of the transformers of the PTs, as well as the voltages and are of the dry type or with oil insulation?

A: Building T-100 should be 500KVA as specified and as shown on E-401. Building T-121 should have a 750KVA as shown on E-401.

3. Spec Section 26 12 19.10 Paragraph 2.2.1.1 According Specs the primary side of the Power Transformer must be rated for dual voltage 6,9-15 kV, and the insulated load-break connectors and bushing well inserts must be rated for 15 kV. If the loadbreak apparatus 15 kV Class is considered, the maximum rating phase-to-phase is 14,4 kV for this Class. Please inform if 25 kV Class for loadbreak apparatus should be considered.

A: The transformer should be rated 95x125-KV BIL, the bushing wells and elbows should be rated 200A, 25KV, 125KV-BIL. The primary switch should be rated 25KV, 125KV-BIL. Any new HV cable should be rated 25KV.

4. Spec Section 26 12 19.10 Paragraph 2.2.2.b E-401 According Specs the Pad Mounted Transformer power rating is 500 kVA. According Single Line Diagram the Transformer power rating is 750 kVA.

Please clarify which rated power is required (500 or 750 kVA)?

A: See comment #2

5. Spec Section 26 32 13.00 20 Paragraph 2.1.1 E-401 According Specs the Engine Generator power rating is 480 kW. According the Single Line Diagram the Generator power rating is 565 kW. Please clarify which rated power rating is required (480 KW or 565 kW)?

A: The standby rating for the generator should be 565KW/706KVA.

6. Dwg E-401 due the above Generator power rating clarifications, please confirm if the required rating for the ATS - Automatic Transfer Switch will be 1200 A?

A: ATS shall be rated for 1200A

7. Dwg E-501 According Single Line Diagram the Panelboard P1 is rated for 150 A. According Panel P1 Schedule the Mains Lugs are rated for 150 A. According Panel MSB Schedule the Circuit Breaker for P1 feeder is 400 A. Please clarify which breaker trip rating is required for P1 feeder (150 or 400 A)?

A: The circuit breaker trip rating for P1 should be 150A

8. Dwg E-401 & E-501 According Single Line Diagram the Panelboard P2 is rated for 225 A. According Panel P2 Schedule the Mains Lugs are rated for 225 A. According Panel MSB Schedule the Circuit Breaker for P2 feeder is 800 A. Please clarify which breaker trip rating is required for P2 feeder (225 or 800 A)?

A: The circuit breaker trip rating for P2 should be 225A

9. Dwg E-401 & E-501 According Single Line Diagram is required to install a SPD - Surge Protective Device for Panelboard K2. According Panel K2 Schedule, is not considered a 3P circuit breaker for this propose. Please confirm if it is required to install a new 3P circuit breaker in Panel K2 to feed the

SPD?

A: In panelboard K2, provide a 3-pole/32amp circuit breaker in circuit 50,52,54 for the SPD

10. Specs Section 26 24 13 E-501 Regarding Switchboards, according Specs, the required short-circuit current rating is 22000 rms symmetrical amps. Normally the short-circuit current rating of 18000 rms symmetrical amps. Please clarify if circuit breakers with a short-circuit current rating of 18000 rms symmetrical amps are acceptable?

A: The available fault current at the 750KVA transformer secondary was calculated to be greater than 18KA. Provide 22,000 rms symmetrical amps rating as specified.

11. Section 26 41 00 Paragraph 3.1.4 E-401 Key Note 8 According Specs the ground ring conductor is # 1/0 bare stranded copper. According Drawings Key Notes and Details is required # 4/0 bare stranded copper. Please clarify which conductor size is required (1/0 or 4/0)?

A: The lighting protection system building counterpoise in Note 8 may be reduced to #1/0 CU to match specification section 26 41 00, 3.1.4, however, all other callouts for #4/0 CU must be used in order to comply with UFC 3-550-01, 3-14.2.2.

12. Specs 09 62 38 The Specifications includes a Spec Section for Static-Control Flooring, however there is no reference where this type of flooring is to be installed. Please clarify.

A: This specification section is not applicable to the project and can be removed.