Electrical Power Supply and Distribution - index
Electrical Power Supply and Distribution - ufc_3_550_03fa0001
Unified Facilities Criteria (UFC) - ufc_3_550_03fa0002
Foreword - ufc_3_550_03fa0003
Electrical Power Supply and Distribution - ufc_3_550_03fa0004
Chapter 1 General - ufc_3_550_03fa0009
Design Procedures
Figure 1-1. Primary Distribution Arrangements Commonly Used.
Design Analysis - ufc_3_550_03fa0012
Service Conditions
Table 1-1. Service Conditions.
Chapter 2 Electrical Power Requirements
Table 2-2. Diversity Factors
Figure 2-2. Monthly Electric Cost Computation.
Chapter 3 Voltage Selection
Table 3-2. Nominal System Voltages
Commercial Power for Air Force Installations
Chapter 4 Main Electrical Supply Station/Substations
Ownership
Environmental Aspects
Figure 4-1. Converting Utility Company Short-Circuit MVA to Current
Incoming line Switching Equipment
Substation Equipment
Figure 4-2. Example of Sizing Substation Transformer Capacity
Figure 4-3. Single-Line of Primary Unit Substation with Two Transformers
Figure 4-4. Circuit Breaker Interrupting Rating Approximation
Table 4-2. Minimum Metering for Metal-Clad Switchgear
Instrument transformers - ufc_3_550_03fa0031
Table 4-4. Current Transformer (CT) Accuracy Class Ratings for Outdoor Circuit Breakers
Substation Equipment at Air Force Installations
Figure 4-5. Primary Unit Substation, 46 kV Minimum.
Table 4-5. Primary Insulator Ratings by Class
Operating equipment for breakers
Chapter 5 Electric Distribution Lines
Voltage Drop
Figure 5-1. Normal Allocation of Voltage Drop.
Figure 5-2. An Example of Voltage Drop Calculation.
Figure 5-3. Average Energy Savings Example.
Table 5-1. Three-Phase Medium-Voltage Circuit Loading Check Values
Pad Mounted Sectionalizing Equipment
Chapter 6 Aerial Distribution Lines
Table 6-1. Conductors Materials-Physical Properties.
Table 6-2. Initial Stringing Sags for 200-Foot Spans
Table 6-3. Final Loaded Tensions for 200-Foot Spans
Figure 6-1. An Example of an Aerial Conductor Strength Analysis.
Table 6-5. Minimum Pole-Setting Depth
Table 6-6. Relation of Crossarm Configuration to Conductor Size
Figure 6-2. Tangent Construction Configurations
Figure 6-3. Armless Configurations
Figure 6-4. Crossarm Configurations
Figure 6-5. Neutral-Supported Secondary Cable Configurations
Guying - ufc_3_550_03fa0055
Figure 6-6. Ranges of Insulator Dimensions.
Table 6-7. Anchors Suitable for Various Soils.
Figure 6-7. Expanding Anchor Details
Figure 6-8. Types of Guy Installations
Figure 6-9. Guy Details
Figure 6-10. An Example of an In-Line Guy Strength Analysis
Figure 6-11. An Example of a Pole Strength Analysis.
Air Force Installations
Chapter 7 Underground Distribution Lines
Insulation and jacket material
Table 7-1. Rated Conductor Temperatures.
Connectors - ufc_3_550_03fa0067
Figure 7-1. Fireproofing of Insulated Cables.
Table 7-2. Comparison of DC Test Voltages (kV)
Manholes, Handholes, and Pullboxes.
Figure 7-2. Concrete Encased Duct Details
Figure 7-3. Duct Line Drainage.
Figure 7-4. Factors Influencing Manhole Design
Figure 7-5. A Scale Example of a Cable Installed in a Manhole
Figure 7-6. Typical Double Manhole
Figure 7-7. Manhole Appurtenances
Figure 7-8. Electric or Communication Handhole
Figure 7-9. Pullbox Installation
Figure 7-10. Underground System Marker
Chapter 8 Transformer Installations
Figure 8-1. Cluster-Mounted Transformer Bank Installation
Figure 8-2. Crossarm-Mounted Transformer Bank Installation
Installation of Transmission-to-Distribution Voltage Transformers
Figure 8-3. Pad-Mounted Compartmental Transformer Installation
Figure 8-4. Secondary Unit Substation Transformer Installation
Figure 8-5. Secondary Unit Substation Transformer Installation
Table 8-1. Transformer Standard Base kVA Ratings.
Table 8-2. Daily Allowable Peak Loads for Normal Life Expectancy
Table 8-4. Basic Impulse Insulation Levels
Table 8-5. Standard Secondary Unit Substation Percent Impedances
Amorphous Metal-Core Transformers
Chapter 9 Surge Protection and Grounding
Table 9-1. Aerial-Mounted Liquid-Filled Transformer Surge Protective Margins
Location - ufc_3_550_03fa0094
Figure 9-1. Zones of Protection for Masts and Shield Wires
Ground Electrodes
Table 9-2. Resistance of One 5/8-Inch by 10-Foot Ground Rod in Various Soils
Figure 9-2. Grounding of a Main Electric Supply Substation
Figure 9-3. Grounding of Secondary Unit Substation Installation
Figure 9-4. Provision of Surge Arresters at a Medium-Voltage Riser Pole
Ground fault return conductor
Chapter 10 Roadway and Areal Lighting
Figure 10-1. Typical Roadway Lighting Installation
Figure 10-2. Lateral Lighting Distributions
Figure 10-3. Intersection Lighting Placement
Table 10-3. Characteristics of Light Sources
Figure 10-4. Key to Standard HID Lamp Designations
Grounding - ufc_3_550_03fa0108
Chapter 11 Security Lighting
Table 11-1. Security Lighting Requirements.
Figure 11-1. Application of Required Lighting Intensities
Light Sources
Table 11-2. Floodlight Beam Descriptions
Field Measurements
Appendix A References - ufc_3_550_03fa0115
Appendix A References - Cont'd - ufc_3_550_03fa0116
Appendix A References - Cont'd - ufc_3_550_03fa0117
Appendix A References - Cont'd - ufc_3_550_03fa0118
Appendix A References - Cont'd - ufc_3_550_03fa0119
Appendix B Sizing of Distribution Transformers for Family Housing Units
Glossary - ufc_3_550_03fa0121
Glossary - Cont'd - ufc_3_550_03fa0122
Glossary - Cont'd - ufc_3_550_03fa0123
Glossary - Cont'd - ufc_3_550_03fa0124
Electrical Power Supply and Distribution - ufc_3_550_03fa0001
Unified Facilities Criteria (UFC) - ufc_3_550_03fa0002
Foreword - ufc_3_550_03fa0003
Electrical Power Supply and Distribution - ufc_3_550_03fa0004
Chapter 1 General - ufc_3_550_03fa0009
Design Procedures
Figure 1-1. Primary Distribution Arrangements Commonly Used.
Design Analysis - ufc_3_550_03fa0012
Service Conditions
Table 1-1. Service Conditions.
Chapter 2 Electrical Power Requirements
Table 2-2. Diversity Factors
Figure 2-2. Monthly Electric Cost Computation.
Chapter 3 Voltage Selection
Table 3-2. Nominal System Voltages
Commercial Power for Air Force Installations
Chapter 4 Main Electrical Supply Station/Substations
Ownership
Environmental Aspects
Figure 4-1. Converting Utility Company Short-Circuit MVA to Current
Incoming line Switching Equipment
Substation Equipment
Figure 4-2. Example of Sizing Substation Transformer Capacity
Figure 4-3. Single-Line of Primary Unit Substation with Two Transformers
Figure 4-4. Circuit Breaker Interrupting Rating Approximation
Table 4-2. Minimum Metering for Metal-Clad Switchgear
Instrument transformers - ufc_3_550_03fa0031
Table 4-4. Current Transformer (CT) Accuracy Class Ratings for Outdoor Circuit Breakers
Substation Equipment at Air Force Installations
Figure 4-5. Primary Unit Substation, 46 kV Minimum.
Table 4-5. Primary Insulator Ratings by Class
Operating equipment for breakers
Chapter 5 Electric Distribution Lines
Voltage Drop
Figure 5-1. Normal Allocation of Voltage Drop.
Figure 5-2. An Example of Voltage Drop Calculation.
Figure 5-3. Average Energy Savings Example.
Table 5-1. Three-Phase Medium-Voltage Circuit Loading Check Values
Pad Mounted Sectionalizing Equipment
Chapter 6 Aerial Distribution Lines
Table 6-1. Conductors Materials-Physical Properties.
Table 6-2. Initial Stringing Sags for 200-Foot Spans
Table 6-3. Final Loaded Tensions for 200-Foot Spans
Figure 6-1. An Example of an Aerial Conductor Strength Analysis.
Table 6-5. Minimum Pole-Setting Depth
Table 6-6. Relation of Crossarm Configuration to Conductor Size
Figure 6-2. Tangent Construction Configurations
Figure 6-3. Armless Configurations
Figure 6-4. Crossarm Configurations
Figure 6-5. Neutral-Supported Secondary Cable Configurations
Guying - ufc_3_550_03fa0055
Figure 6-6. Ranges of Insulator Dimensions.
Table 6-7. Anchors Suitable for Various Soils.
Figure 6-7. Expanding Anchor Details
Figure 6-8. Types of Guy Installations
Figure 6-9. Guy Details
Figure 6-10. An Example of an In-Line Guy Strength Analysis
Figure 6-11. An Example of a Pole Strength Analysis.
Air Force Installations
Chapter 7 Underground Distribution Lines
Insulation and jacket material
Table 7-1. Rated Conductor Temperatures.
Connectors - ufc_3_550_03fa0067
Figure 7-1. Fireproofing of Insulated Cables.
Table 7-2. Comparison of DC Test Voltages (kV)
Manholes, Handholes, and Pullboxes.
Figure 7-2. Concrete Encased Duct Details
Figure 7-3. Duct Line Drainage.
Figure 7-4. Factors Influencing Manhole Design
Figure 7-5. A Scale Example of a Cable Installed in a Manhole
Figure 7-6. Typical Double Manhole
Figure 7-7. Manhole Appurtenances
Figure 7-8. Electric or Communication Handhole
Figure 7-9. Pullbox Installation
Figure 7-10. Underground System Marker
Chapter 8 Transformer Installations
Figure 8-1. Cluster-Mounted Transformer Bank Installation
Figure 8-2. Crossarm-Mounted Transformer Bank Installation
Installation of Transmission-to-Distribution Voltage Transformers
Figure 8-3. Pad-Mounted Compartmental Transformer Installation
Figure 8-4. Secondary Unit Substation Transformer Installation
Figure 8-5. Secondary Unit Substation Transformer Installation
Table 8-1. Transformer Standard Base kVA Ratings.
Table 8-2. Daily Allowable Peak Loads for Normal Life Expectancy
Table 8-4. Basic Impulse Insulation Levels
Table 8-5. Standard Secondary Unit Substation Percent Impedances
Amorphous Metal-Core Transformers
Chapter 9 Surge Protection and Grounding
Table 9-1. Aerial-Mounted Liquid-Filled Transformer Surge Protective Margins
Location - ufc_3_550_03fa0094
Figure 9-1. Zones of Protection for Masts and Shield Wires
Ground Electrodes
Table 9-2. Resistance of One 5/8-Inch by 10-Foot Ground Rod in Various Soils
Figure 9-2. Grounding of a Main Electric Supply Substation
Figure 9-3. Grounding of Secondary Unit Substation Installation
Figure 9-4. Provision of Surge Arresters at a Medium-Voltage Riser Pole
Ground fault return conductor
Chapter 10 Roadway and Areal Lighting
Figure 10-1. Typical Roadway Lighting Installation
Figure 10-2. Lateral Lighting Distributions
Figure 10-3. Intersection Lighting Placement
Table 10-3. Characteristics of Light Sources
Figure 10-4. Key to Standard HID Lamp Designations
Grounding - ufc_3_550_03fa0108
Chapter 11 Security Lighting
Table 11-1. Security Lighting Requirements.
Figure 11-1. Application of Required Lighting Intensities
Light Sources
Table 11-2. Floodlight Beam Descriptions
Field Measurements
Appendix A References - ufc_3_550_03fa0115
Appendix A References - Cont'd - ufc_3_550_03fa0116
Appendix A References - Cont'd - ufc_3_550_03fa0117
Appendix A References - Cont'd - ufc_3_550_03fa0118
Appendix A References - Cont'd - ufc_3_550_03fa0119
Appendix B Sizing of Distribution Transformers for Family Housing Units
Glossary - ufc_3_550_03fa0121
Glossary - Cont'd - ufc_3_550_03fa0122
Glossary - Cont'd - ufc_3_550_03fa0123
Glossary - Cont'd - ufc_3_550_03fa0124
