G - SRG Grounding System Commissioning.pdf
PDF 105 KB Posted
- Attached to
- DISA Data Center Columbus Raised Access Floor Upgrade Federal contract opportunity
- Solicitation number
- HC102820R0018
- Issued by
- Defense Information Systems Agency
About this file
This document outlines requirements for commissioning the Signal Reference Grid grounding system at the Defense Information Systems Agency Data Center in Columbus, Ohio. Key requirements include retaining a NETA-certified third party to perform grounding system tests, submitting a detailed testing and commissioning plan 60 days prior to scheduled testing, conducting earth electrode resistance tests using the fall of potential method and bonding resistance tests using a four-wire DC resistance bridge method. The contractor must notify the agency 30 days prior to testing and immediately notify the agency if any section or subsystem fails to meet specifications before proceeding. The contractor must submit a report of all test results at the conclusion of testing for agency review and acceptance prior to finalizing the grounding system upgrades.
Related to this is a federal contract opportunity posted by the Defense Information Systems Agency for a raised access floor upgrade and signal reference grid work at the Data Center in Columbus. Interested vendors should review the solicitation and attachments for more information and instructions. Testing and acceptance requirements outlined in the technical document would apply to the work performed under this contract.
View the file
Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| HC102820R0018 00006.pdf | ||
| HC102820R0018 00005.pdf | ||
| HC102820R0018 00004.pdf | ||
| HC102820R0018 AMD0003.pdf | ||
| Appendix A - Concept Plan (2020-06-03).pdf | ||
| HC102820R0018 00002.pdf | ||
| HC102820R0018 00001.pdf | ||
| F - MIL-STD-188-124B 18Dec2000 (SRG).pdf | ||
| E - Contractor NDA.docx | DOCX document | |
| H - 26-01 Electrical Safety Program.pdf | ||
| C - Signal Reference Grid for Grounding.pdf | ||
| HC102820R0018.pdf | ||
| Price Worksheet.xlsx | XLSX spreadsheet | |
| B - 09 69 13 - Rigid Grid Access Flooring.pdf | ||
| QASP.pdf | ||
| A - CONCEPT DRAWINGS COL-REPLACE RAISED FLOORS-SRG.pdf | ||
| D - Project Close-out.pdf |
Show all 17
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Text version
UNCLASSIFIED – FOR OFFICIAL USE ONLY
Data Center Columbus Appendix G
UNCLASSIFIED – FOR OFFICIAL USE ONLY Page 1 of 2
SECTION 26 05 27
GROUNDING SYSTEM COMMISSIONING
1. PURPOSE
This specification details the requirements for Commissioning the Signal Reference Grid (SRG).
2. SCOPE
A. The SRG system is a part of a completely interconnected grounding system that includes the equipment grounding for NEC compliant fault and personnel protection, the lightning protection subsystem and the telecommunications and data processing and signaling surge protection grounding subsystem.
B. The SRG is an isolated subsystem of the grounding system – connected only at the SRG Grounding Bus.
C. All of the grounding systems in the facility are electrically common to one another by use of carefully installed conductors and bonding materials.
D. Testing shall be performed in a planned sequence of events. In the event of a failure to achieve the required results, the Testing Contractor shall immediately notify the installation Contractor so that corrective action can be taken.
E. All testing must be done while the facility continues to operate. This will require isolation of subsystem to be tested and temporarily providing for continued operation of the Owner equipment thus isolated.
3. REFERENCES
The publications listed below form a part of this specification to the extent referenced. The publications are referred within the text by the basic designation only. The current revision of the reference, including all issued updates, must be followed.
A. MIL HDBK 419A – Grounding, Bonding, and Shielding for Electronic Equipments and Facilities.
B. IEEE 1100 – Power and Grounding Electronic Equipment C. FIPS Pub 94-1983 – Guidelines for Electrical Power for ADP Installations D. IEEE 81 – Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System
E. NETA ATS-2009
4. QUALIFICATIONS
A. Contractor shall retain the services of a third-party, NETA-certified testing organization to perform the required grounding system tests.
B. Testing organization shall have a minimum of five (5) years’ documented experience in the testing and commissioning of grounding systems.
5. SUBMITTALS
Contractor shall submit a detailed testing and commissioning plan and schedule 60 days prior to the scheduled testing for review and acceptance by the Owner and Engineer of Record.
A. Testing and commissioning plan shall be specifically prepared for this project and shall detail the various points to be tested, preparations to be made, proposed current and voltage probe locations for earth electrode tests, and test equipment to be used (make and model).
B. Submit certificates of calibration for all test equipment to be used.
C. Testing and commissioning plan shall include appropriate forms for recording the data obtained in the testing.
UNCLASSIFIED – FOR OFFICIAL USE ONLY
Data Center Columbus Appendix G
UNCLASSIFIED – FOR OFFICIAL USE ONLY Page 2 of 2
6. REQUIREMENTS
6.1 GENERAL DESCRIPTION
A. All testing must be made with the facility in operation. Therefore, the testing of the ground electrode subsystem must be performed on various portions of the system individually. Provisions will be made by the Owner to temporarily isolate the portions of the system for the individual tests. The contractor shall be required to provide temporary grounding jumpers so that the integrity of the operating facility is not compromised while portions of the grounding system are isolated for testing. The sequence for isolating and testing the various portions of the system is described in general in this document and must be included in detail in the contractor’s testing and commissioning plan.
B. Testing Methods
1. Earth electrode resistance tests shall be performed using the “fall of potential” method as described in MIL HDBK 419A Volume 1 Paragraph 2.72 and IEEE 81 Paragraph 8.2.1.5.
2. Bonding resistance tests shall be performed using the “four wire” method utilizing a balanced DC resistance bridge as described in MIL HDBK 419A Volume 2 Paragraph 2.2.2.3.1.
6.2 NOTIFICATION
A. Notify the Owner and Engineer a minimum of 30 days prior to performing the ground system testing and commissioning.
B. Notify the Owner and Engineer if any section or subsystem being tested does not meet the requirements of this specification before proceeding further. In no case shall a permanent connection be made before receiving approval to proceed from the Owner and Engineer.
6.3 TESTING
As per Signal Reference Grid for Grounding – Appendix C.
6.4 BONDING CONNECTIONS
1. Each computer room signal reference ground loop tie conductor to the ground loop, minimum of 30% of installed locations per computer room.
2. Each SRG loop back to SRG Ground Bus.
3. The maximum acceptable resistance value from any of the above points through all bonding connections to the Lightning Protection counterpoise is 50 milliohms.
6.4 REPORTS
A. A report of all test results shall be submitted at the conclusion of the testing for review by the Owner and Engineer prior to final acceptance of the installed grounding system upgrades.
B. Submit three copies of the report in a three ring binder indexed by subsystem tested.
- - End of Document - -
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