Unified Facilities Criteria (Ufc) Interior Electrical Systems
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UFC 3-520-01 June 10, 2002 UNIFIED FACILITIES CRITERIA (UFC) INTERIOR ELECTRICAL SYSTEMS U.S. ARMY CORPS OF ENGINEERS NAVAL FACILITIES ENGINEERING COMMAND CANCELLED AIR FORCE CIVIL ENGINEER SUPPORT AGENCY (Preparing Activity) APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED UFC 3-520-01 June 10, 2002 UNIFIED FACILITIES CRITERIA (UFC) UNIFIED FACILITIES GUIDE SPECIFICATIONS (UFGS) FORMAT STANDARD 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. Record of Changes (changes are indicated by \1\ ... /1/) Change No. Date Location CANCELLED UFC 3-520-01 June 10, 2002 FOREWORD 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. DR. JAMES W WRIGHT, P.E. Chief, Engineering and Construction Chief Engineer U.S. Army Corps of Engineers Naval Facilities Engineering Command ______________________________________ ______________________________________ KATHLEEN I. FERGUSON, P.E. Dr. GET W. MOY, P.E. The Deputy Civil Engineer Director, Installations Requirements and DCS/InstallationsCANCELLED & Logistics Management Department of the Air Force Office of the Deputy Under Secretary of Defense (Installations and Environment) UFC 3-520-01 June 10, 2002 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: ______________________________________ ______________________________________ Dwight A. Beranek, P.E. Dr. James W Wright, P.E. Chief, Engineering and Construction Division Chief Engineer U.S. Army Corps of Engineers Naval Facilities Engineering Command ______________________________________ ______________________________________ KATHLEEN I. FERGUSON, P.E. Frank Lane The Deputy Civil Engineer Director of Analysis & Investment DCS/Installations & Logistics Deputy Under Secretary of Defense Department of the Air Force for Installations and Environment Department of Defense CANCELLED UFC 3-520-01 June 10, 2002 CONTENTS Page CHAPTER 1 GENERAL Paragraph 1-1 PURPOSE ...................................................................................... 1-1 1-2 SCOPE............................................................................................ 1-1 1-3 REFERENCES ............................................................................... 1-1 1-4 CODES AND STANDARDS........................................................... 1-2 1-5 SYMBOLS....................................................................................... 1-2 1-6 APPLICABILITY.............................................................................. 1-3 1-7 MANUAL CONTENT AND ORGANIZATION................................. 1-3 CHAPTER 2 PRELIMINARY AND DETAILED DESIGN ANALYSIS Paragraph 2-1 PRELIMINARY DESIGN ................................................................ 2-1 2-1.1 Principal Points of Contact............................................................. 2-1 2-1.2 Preliminary Design Guidance for Interior Electrical Systems........ 2-1 2-1.3 Unified Facilities Guide Specifications ........................................... 2-2 2-2 ELECTRICAL LOAD CRITERIA..................................................... 2-2 2-3 OVERVIEW OF DETAILED ANALYSIS CRITERIA ..................... 2-3 2-4 SHORT CIRCUIT ANALYSIS ......................................................... 2-5 2-4.1 Analysis and Equipment Criteria .................................................... 2-5 2-4.2 Short Circuit Sources...................................................................... 2-5 2-4.3 Symmetrical Versus Asymmetrical Current ................................... 2-6 2-4.4 Short Circuit Calculations ............................................................... 2-7 2-5 POWER FLOW ANALYSIS ............................................................ 2-8 2-6 VOLTAGE DROP ANALYSIS ........................................................ 2-9 2-6.1 Voltage Drop Calculations .............................................................. 2-9 2-6.2 Motor Starting Studies .................................................................... 2-9 2-7 ELECTRICAL COORDINATION .................................................... 2-10 2-8 POWER QUALITY AND HARMONIC DISTORTION .................... 2-10 2-9 LIGHTING ....................................................................................... 2-11 2-10 ENERGY ANALYSIS ...................................................................... 2-11 2-10.1 Overview ......................................................................................... 2-11 2-10.2 New Facility Criteria ........................................................................ 2-12 2-10.3 Existing Facilities ............................................................................ 2-13 2-10.4 Energy Efficiency Design Opportunities in the Electrical System.. 2-13 2-11 LIFE-CYCLE COST ANALYSIS ..................................................... 2-14 2-12 ELECTRICAL DRAWINGS............................................................. 2-15 2-12.1 Introduction ..................................................................................... 2-15 2-12.2 One-Line Diagrams......................................................................... 2-15 2-12.3 Switchgear Lineups ........................................................................ 2-15 CANCELLED2-12.4 MCC Layouts .................................................................................. 2-15 2-12.5 Grounding ....................................................................................... 2-15 2-12.6 Control Panel Wiring Diagrams...................................................... 2-15 2-12.7 Control Schematics......................................................................... 2-15 2-12.8 Miscellaneous Interconnection Diagrams...................................... 2-15 2-12.9 Equipment Layouts with Conduit or Cable Tray............................. 2-15 2-12.10 Panel Schedules ............................................................................. 2-16 2-12.11 Lighting and Receptacle Layouts ................................................... 2-16 2-12.12 Motor List........................................................................................ 2-16 2-12.13 Conduit or Cable Schedule............................................................. 2-16 i UFC 3-520-01 June 10, 2002 CHAPTER 3 GENERAL POWER SYSTEM CRITERIA Paragraph 3-1 CHARACTERISTICS...................................................................... 3-1 3-1.1 Voltage ............................................................................................ 3-1 3-1.2 Frequency....................................................................................... 3-2 3-1.3 Power Factor................................................................................... 3-2 3-1.4 Neutral Conductor Grounding ........................................................ 3-2 3-2 NORMAL POWER SOURCE......................................................... 3-2 3-3 ALTERNATE AND BACKUP POWER SOURCE .......................... 3-4 3-4 SERVICES...................................................................................... 3-5 CHAPTER 4 POWER DISTRIBUTION AND UTILIZATION—TRANSFORMERS Paragraph 4-1 RATINGS ........................................................................................ 4-1 4-1.1 Introduction ..................................................................................... 4-1 4-1.2 Voltage