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UFS 3-520-01 05 June 2026 UNIFIED FACILITIES SUPPLEMENT (UFS) APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED INTERIOR ELECTRICAL SYSTEMS UFS 3-520-01 05 June 2026 FOREWORD Unified Facilities Supplements (UFS) provide non-mandatory, supplemental information in support of Unified Facilities Criteria (UFC). Only UFC establish enforceable criteria. UFS are For Information Only (FIO) and exist to help users understand and apply UFC requirements. The purpose of UFS is to offer procedural guidance, best practices, lessons learned, examples, and explanatory materials that clarify how to meet UFC criteria. They may include step-by-step procedures, checklists, illustrations, or decision aids, but they do not create new requirements or modify UFC content. UFS are developed by Discipline Working
Nearby capacitor switching can cause transient overvoltages, resulting in nuisance tripping. In this case, ensure the ASD either has input filtering to reduce the overvoltage or automatic reset circuitry. UFS 3-520-01 05 June 2026 5 A-1.5 Bypass Capability. Important applications should include bypass operation capability to allow motor operation independent of the ASD. UFS 3-520-01 05 June 2026 6 APPENDIX B POWER QUALITY B-1 INTRODUCTION. Unlike other electrical design requirements, power quality design solutions are very dependent on the types of transients and disturbances that can and will occur in power systems. In many cases, it will be easier to provide protection and power quality design features to specific equipment rather than generically throughout the facility. B-2 UNBALANCED
new requirements or modify UFC content. UFS are developed by Discipline Working Groups (DWGs) and published by the Military Services under MIL-STD-3007. Because they are not criteria, they do not require Coordinating Panel (CP) or Engineering Senior Executive Panel (ESEP) approval. UFS content may be referenced or incorporated into project documents at the discretion of project delivery teams but are not binding unless explicitly included in contract requirements. For Service-specific supplemental guidance, refer to Facilities Supplements (FS). UFS 3-520-01 05 June 2026 i UNIFIED FACILITIES SUPPLEMENT (UFS) ELECTRICAL ENGINEERING TABLE OF CONTENTS CHAPTER 1 POWER DISTRIBUTION AND UTILIZATION ........................................... 1 1-1 SERVICE ENTRANCE AND DISTRIBUTION EQUIPMENT .....
ry (simple system) or if this is accomplished automatically through the equipment (complex systems using Digital Signal Processor) 1-5 GROUNDING, BONDING, AND STATIC PROTECTION. TIA-607 identifies a bonding conductor known as the telecommunications bonding backbone (TBB) which is intended to equalize potentials between TRs. The impedance of the TBB increases with length, thereby reducing its ability to equalize potential UFS 3-580-01 05 June 2026 30 between TRs. The ICT designer must consider that the TBB for a large site may be very costly to achieve. Refer to Figure 2-12. Building grounding systems are covered in UFC 3-520-01. Figure 1-12 Telecommunications Grounding and Bonding Infrastructure UFS 3-580-01 05 June 2026 31 BBC Backbone Bonding Conductor TBB Telecommunications Bonding Back
aircraft maintained. Aircraft inspection occurs within the maintenance hangar. Table 7.2.38. Building Utility System Requirements for Maintenance Support Facility. System Requirements Mechanical Proper ventilation system and energy efficient HVAC system are required. Repair and reclamation shop requires 150-psi shop air and corrosion resistant drains. Applicable criteria include UFC 3-401-01 for mechanical. Electrical Industrial equipment typically requires 240- and 480-volt, three-phase electrical current. Use commercial grade convenience receptacles and special power outlets. Applicable criteria include UFC 3-501-01 for general electrical requirements, UFC 3-520-01 for interior electrical systems requirements, UFC 3-530-01 for interior and exterior lighting and controls requirements, UF
Install GFCI receptacle GFCI receptacles fail to trip. Yes No 4-6.2.11 Replace GFCI receptacle UFS 1-201-02 28 July 2025 87 CONDITION ASSESSED CONDITIONS FOR FURTHER INFORMATION SEE ALLOWED FIELD MITIGATION RECORD ACTUAL CONDITIONS AND ACTIONS TAKEN IN SPACE PROVIDED BELOW ASSESSED ITEM. Circuit lockout requirements Appropriate circuit lock-out procedures exist. Yes No 4-6.1.11 Develop procedures to properly lock out and tag out electrical systems prior to occupation per UFC 3-520- 01. UFS 1-201-02 28 July 2025 88 Additional Notes on Electrical System Issues and Mitigation Actions: UFS 1-201-02 28 July 2025 89 TELECOMMUNICATION SYSTEMS INSPECTOR NAME: CONDITION ASSESSED CONDITIONS FOR FURTHER INFORMATION SEE ALLOWED FIELD MITIGATION RECORD ACTUAL CONDITIONS AND ACTIONS TAKEN IN SPA
1.7-520.2 21.9 13.6 32.3 6.1 E A C 7 386.1-412.8 12.2 L B C 34 424.9-488.6 15.5 N A C 58 520.3-520.6 21.3 12.5 31.8 5.6 E A C 6 412.9-424.8 11.9 L B C 31 488.7-647.3 15.3 L A C 58 520.7-713.3 20.9 12.3 31.6 5.4 D A C 6 424.9-441.6 11.8 L A C 31 647.4-679.0 14.8 E A C 58 UFS 4-010-01 1 July 2026 145 713.4-844.3 20.5 11.7 31.3 5.1 D A C 5 441.7-520.6 11.1 E A C 31 679.1-742.7 12.5 E A C 54 844.4-914.6 20.4 11.5 31.2 5.0 D A C 3 520.7-799.7 10.9 D A C 31 742.8-794.1 12.4 D A C 54 914.7- 1024.9 20.2 11.2 31.1 4.9 D A C 1 799.8-851.0 9.8 D A C 30 794.2-864.7 11.7 D A C 51 1025.0- 15.4 5.0 2.6 2.7 D A A 1 851.1-899.5 9.2 D A C 26 864.8-1024.9 11.6 D A C 50 899.6-1024.9 9.1 D A C 25 1025.0- 5.4 D A A 50 1025.0- 4.5 D A A 25 UFS 4-010-01 1 July 2026 146 Table A-25 Building Cost Increases Hand Deli
of UPS systems on generator sizing. d. Load Analysis for Alternate Energy Systems: • Provide maximum power calculations applicable to the type of alternate energy system. This includes: i. DC systems, including 270 VDC charging systems. ii. Frequency conversion equipment. UFS 3-501-01 05 June 2026 12 iii. Renewable energy systems. e. Load Analysis for Uninterruptible Power Supply (UPS): • Provide sizing calculations in accordance with UFC 3-520-01, section entitled “Stationary Batteries and Battery Chargers”. f. Load Analysis for utility interactive systems and distributed resource island systems (microgrids). Provide a load analysis in accordance with IEEE Std 1547.4 Clause 5. Include a system one-line diagram with system interconnection points. Evaluate historical demand profiles (real a
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