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Electrical power supply and distribution

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  • UFC 3-550-03FA 01 March 2005

    UNIFIED FACILITIES CRITERIA (UFC)

    ELECTRICAL POWER SUPPLY AND

    DISTRIBUTION

    APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED

  • UFC 3-550-03FA 01 March 2005

    1

    UNIFIED FACILITIES CRITERIA (UFC)

    ELECTRICAL POWER SUPPLY AND DISTRIBUTION

    Any copyrighted material included in this UFC is identified at its point of use. Use of the copyrighted material apart from this UFC must have the permission of the copyright holder. U.S. ARMY CORPS OF ENGINEERS (Preparing Activity) NAVAL FACILITIES ENGINEERING COMMAND AIR FORCE CIVIL ENGINEER SUPPORT AGENCY Record of Changes (changes are indicated by \1\ ... /1/) Change No. Date Location

    This UFC supersedes TM 5-811-1, dated February 1995. The format of this UFC does not conform to UFC 1-300-01; however, the format will be adjusted to conform at the next revision. The body of this UFC is a document of a different number.

  • UFC 3-550-03FA 01 March 2005

    2

    FOREWORD \1\ The Unified Facilities Criteria (UFC) system is prescribed by MIL-STD 3007 and provides planning, design, construction, sustainment, restoration, and modernization criteria, and applies to the Military Departments, the Defense Agencies, and the DoD Field Activities in accordance with USD(AT&L) Memorandum dated 29 May 2002. UFC will be used for all DoD projects and work for other customers where appropriate. All construction outside of the United States is also governed by Status of forces Agreements (SOFA), Host Nation Funded Construction Agreements (HNFA), and in some instances, Bilateral Infrastructure Agreements (BIA.) Therefore, the acquisition team must ensure compliance with the more stringent of the UFC, the SOFA, the HNFA, and the BIA, as applicable. UFC are living documents and will be periodically reviewed, updated, and made available to users as part of the Services responsibility for providing technical criteria for military construction. Headquarters, U.S. Army Corps of Engineers (HQUSACE), Naval Facilities Engineering Command (NAVFAC), and Air Force Civil Engineer Support Agency (AFCESA) are responsible for administration of the UFC system. Defense agencies should contact the preparing service for document interpretation and improvements. Technical content of UFC is the responsibility of the cognizant DoD working group. Recommended changes with supporting rationale should be sent to the respective service proponent office by the following electronic form: Criteria Change Request (CCR). The form is also accessible from the Internet sites listed below. UFC are effective upon issuance and are distributed only in electronic media from the following source: Whole Building Design Guide web site http://dod.wbdg.org/. Hard copies of UFC printed from electronic media should be checked against the current electronic version prior to use to ensure that they are current. AUTHORIZED BY: ______________________________________ DONALD L. BASHAM, P.E. Chief, Engineering and Construction U.S. Army Corps of Engineers

    ______________________________________DR. JAMES W WRIGHT, P.E. Chief Engineer Naval Facilities Engineering Command

    ______________________________________ KATHLEEN I. FERGUSON, P.E. The Deputy Civil Engineer DCS/Installations & Logistics Department of the Air Force

    ______________________________________Dr. GET W. MOY, P.E. Director, Installations Requirements and Management Office of the Deputy Under Secretary of Defense (Installations and Environment)

  • ARMY TM 5-811-1AIR FORCE AFJMAN 32-1080

    ELECTRICAL POWER SUPPLYAND DISTRIBUTION

    APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS UNLIMITED

    DEPARTMENTS OF THE ARMY, AND THE AIR FORCEFEBRUARY 1995

  • REPRODUCTION AUTHORIZATION/RESTRICTIONS

    This manual has been prepared by or for the Government and,except to the extent indicated below, is public property and notsubject to copyright.

    Copyrighted material included in the manual has been used with theknowledge and permission of the proprietors and is acknowledged assuch at point of use. Anyone wishing to make further use of anycopyrighted material, by itself and apart from this text, should seeknecessary permission directly from the proprietors.

    Reprint or republication of this manual should include a creditsubstantially as follows: Joint Departments of the Army and AirForce, TM 5-811-1/AFJMAN 32-1080, Electrical Power Supply andDistribution, 28 February 1995.

    If the reprint or republication includes copyrighted material, thecredit should also state: Anyone wishing to make further use ofcopyrighted material, by itself and apart from this text, should seeknecessary permission directly from the proprietor.

  • iATM 5-811-1/AFJMAN 32-1080

    TECHNICAL MANUAL HEADQUARTERSNO. 5-811-1 DEPARTMENTS OF THE ARMYAIR FORCE JOINT MANUAL AND THE AIR FORCENO. 32-1080 WASHINGTON, DC, 28 February 1995

    ELECTRICAL POWER SUPPLY AND DISTRIBUTIONParagraphPage

    CHAPTER 1. GENERALPurpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1-1Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 1-1References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 1-1Standards and Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4 1-1Power Supply Design Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 1-1Electrical Power Sytems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 1-1Design Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7 1-2Evaluation and Selection of Energy Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8 1-2Design Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9 1-4Service Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10 1-5Explanation of Abbreviations and Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11 1-6

    CHAPTER 2. ELECTRICAL POWER REQUIREMENTSGeneral. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 2-1Load Estimation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 2-1

    CHAPTER 3. VOLTAGE SELECTIONGeneral. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 3-1System Voltage Classifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2 3-1Selection of Primary Distribution Voltage for New Installations. . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3-1Selection of Primary Distribution Voltage for Existing Installations. . . . . . . . . . . . . . . . . . . . . . . 3-4 3-2Commercial Power for Air Force Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5 3-3Selection of Primary Distribution Voltage for Air Force Installations. . . . . . . . . . . . . . . . . . . . . . 3-6 3-3

    CHAPTER 4. MAIN ELECTRIC SUPPLY STATIONS/SUBSTATIONSProvisions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 4-1Ownership. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2 4-2Station Designation and Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 4-2Main Electric Supply Station/Substation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4 4-2Environmental Aspects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5 4-3Incoming Line Switching Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6 4-4Substation Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7 4-6Miscellaneous Station Design Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8 4-9Substation Equipment at Air Force Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9 4-13

    CHAPTER 5. ELECTRIC DISTRIBUTION LINESSelection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 5-1Types of Underground Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2 5-1Types of Aerial Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3 5-1Voltage Drop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4 5-2Power Factor Correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .