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UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 UNIFIED FACILITIES CRITERIA (UFC) APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED INTERIOR ELECTRICAL SYSTEMS CANCELLED UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 This Page Intentionally Left Blank CANCELLED UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 UNIFIED FACILITIES CRITERIA (UFC) INTERIOR ELECTRICAL SYSTEMS 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. Indicate the Military Department Preparing Activity responsible for the document. U.S. ARMY CORPS OF ENGINEERS NAVAL FACILITIES ENGINEERING SYSTEMS COMMAND (Preparing Activity) AIR FORCE CIVIL ENGINEER CENTER Record of Ch
YSTEMS COMMAND (Preparing Activity) AIR FORCE CIVIL ENGINEER CENTER Record of Changes (changes are indicated by \1\ ... /1/) Change No. Date Location 1 21 Jan 2026 Correct rating in 3-4.1.2 list item c; add calculation to B- 2.1 This UFC supersedes UFC 3-520-01, dated 06 October 2015. CANCELLED UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 This Page Intentionally Left Blank CANCELLED UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 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 us
unctions as specified. Transfer Switch: A device for transferring one or more load conductor connections from one power source to another. Uninterruptible Power Supply System: A system that converts unregulated input power to voltage and frequency controlled filtered ac power that continues without interruption even with the deterioration of the input ac power. Utilization Voltage: The voltage at the line terminals of utilization equipment. CANCELLED UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 50 This Page Intentionally Left Blank CANCELLED UFC 3-520-01 16 January 2025 Change 1, 21 January 2026 51 APPENDIX D REFERENCES UNIFIED FACILITIES CRITERIA https://www.wbdg.org/dod/ufc UFC 1-200-01, DoD Building Code UFC 1-200-02, High Performance and Sustainable Building Requirements UFC
itary Assets UFC 3-401-01, Mechanical Engineering UFC 4-141-03 09 December 2024 112 UFC 3-410-01, Heating, Ventilating, and Air Conditioning Systems UFC 3-410-02, Direct Digital Control for HVAC and Other Building Control Systems UFC 3-460-01, Design: Petroleum Fuel Facilities UFC 3-460-03, Petroleum Fuel Systems Maintenance UFC 3-501-01, Electrical Engineering UFC 3-510-01, Foreign Voltages and Frequencies Guide UFC 3-520-01, Interior Electrical Systems UFC 3-520-02, Facility Energy System Resilience and Reliability UFC 3-520-05, Stationary and Mission Batteries UFC 3-530-01, Interior and Exterior Lighting Systems and Controls UFC 3-540-01, Engine-Driven Generator Systems for Prime and Standby Power Applications UFC 3-560-01, Operation and Maintenance: Electrical Safety UFC 3-580-01, Tele
ications MIL-STD-188-125-1A, High-Altitude Electromagnetic Pulse (HEMP) Protection for Ground-Based C41 Facilities Performing Critical, Time-Urgent Missions, Part 1 Fixed Facilities NSTISSI 7000, TEMPEST Countermeasures for Facilities UNIFIED FACILITIES CRITERIA https://www.wbdg.org/dod/ufc UFC 1-200-01, DoD Building Code UFC 1-200-02, High Performance and Sustainable Building Requirements FC 1-300-09N, Navy and Marine Corps Design Procedures UFC 3-440-01, Facility-Scale Renewable Energy Systems UFC 3-510-01, Foreign Voltages and Frequencies Guide UFC 3-520-01, Interior Electrical Systems UFC 3-520-02, Facility Energy System Resilience and Reliability UFC 3-520-05, Stationary and Mission Batteries UFC 3-530-01, Interior and Exterior Lighting Systems UFC 3-535-01, Visual Air Navigation Faci
vides the criteria for electrical power and lighting systems necessary to protect weapons from electrical energy and provide emergency power and lighting to maintain essential operations without impacting mission requirements. 3-2 ELECTRICAL SYSTEMS NOTE: Cognizant Office of Responsibility for this paragraph is AFCEC. 3-2.1 Design Criteria Electrical systems for nuclear weapons-capable maintenance and storage facilities must be designed to meet the requirements of UFC 3-501-01, UFC 3-520-01, UFC 3-520-05, and UFC 3-550-01. Electrical systems will comply with NFPA 70 and Institute of Electrical and Electronics Engineers (IEEE) C2, National Electrical Safety Code (NESC), except as modified by UFC 3-501-01, UFC 3-520-01, or UFC 3-550-01. Electrical systems must comply with AFI 32-1062, AFI 32
ants UFC 3-430-03, Air Pollution Control Systems for Boiler and Incinerators UFC 3-440-01, Facility-Scale Renewable Energy Systems UFC 3-440-05N, Tropical Engineering UFC 3-450-01, Noise and Vibration Control UFC 3-501-01, Electrical Engineering UFC 3-510-01, Foreign Voltages and Frequencies Guide UFC 3-520-01, Interior Electrical Systems UFC 3-520-05, Stationary Battery Areas UFC 3-530-01, Design: Interior and Exterior Lighting and Controls UFC 3-540-01, Engine-Driven Generator Systems for Backup Power Applications UFC 3-550-01, Exterior Electrical Power Distribution UFC 3-560-01, Electrical Safety, O&M UFC 3-575-01, Lightning and Static Electricity Protection Systems UFC 3-580-01, Telecommunications Building Cabling Systems Planning and Design UFC 3-600-01, Fire Protection Engineering fo
eld and Heliport Planning and Design UFC 3-301-01, Structural Engineering UFC 3-400-02, Design: Engineering Weather Data UFC 3-410-01, Heating, Ventilating, and Air Conditioning Systems UFC 3-420-01, Plumbing Systems UFC 3-450-01, Noise and Vibration Control UFC 3-490-06, Elevators UFC 3-501-01, Electrical Engineering UFC 3-520-01, Interior Electrical Systems UFC 3-520-05, Stationary and Mission Batteries UFC 3-530-01, Interior and Exterior Lighting Systems and Controls UFC 3-535-01, Visual Air Navigation Facilities UFC 3-535-02, Design Drawings for Visual Air Navigation Facilities UFC 3-540-01, Engine Driven Generator Systems for Backup Power Applications UFC 3-575-01, Lightning and Static Electricity Protection Systems UFC 3-580-01, Telecommunications Interior Infrastructure Planning and
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