NFPA 501:2022

Chapter 1 General 1.1 Scope. 1.2 Definitions. 1.3 Consumer Manual Requirements. 1.4 Incorporation by Reference. 1.5 Data Plate. 1.6 Serial Number. 1.7 Excluded Structures. 1.8 Waivers. 1.9 Interpretive Bulletins. 1.10 Use of Alternative Construction. 1.11 Certification Label. Chapter 2 Referenced Publications (Reserved) Chapter 3 Reserved Chapter 4 Planning Considerations 4.1 Scope. 4.2 Special Definitions. 4.3 Light and Ventilation. 4.4 Ceiling Heights. 4.5 Exit Facilities — Exterior Doors. 4.6 Exit Facilities — Egress Windows and Devices. 4.7 Interior Privacy. 4.8 Interior Passage Doors. 4.9 Room Requirements. 4.10 Minimum Room Dimensions. 4.11 Bathroom Passage Doors. 4.12 Hallways. 4.13 Glass and Glazed Openings. 4.14 Landings. 4.15 Handrails. 4.16 Guards. 4.17 Stairway Illumination. Chapter 5 Fire Safety 5.1 Scope. 5.2 Definitions. 5.3 Flame Spread. 5.4 Fire Safety of Bathrooms. 5.5 Kitchen Cabinet Protection. 5.6 Carpeting. 5.7 Fireblocking. 5.8 Requirements for Thermal Insulating Materials. 5.9 Smoke Alarms, Smoke Detection, and Household Fire Alarm Systems. 5.10 Fire Testing. 5.11 Fire Sprinkler System. 5.12 Attached Garages. 5.13 Carbon Monoxide Detectors. Chapter 6 Body and Frame Construction Requirements 6.1 Scope. 6.2 Definitions. 6.3 General Requirements. 6.4 Minimum Standards. 6.5 Structural Design Requirements. 6.6 Windstorm Protection. 6.7 Resistance to Elements and Use. 6.8 Formaldehyde Emission Controls for Certain Wood Products. Chapter 7 Testing 7.1 Structural Load Tests. 7.2 Test Procedure for Roof Trusses. 7.3 Requirements for Windows, Sliding Glass Doors, and Skylights Used in Manufactured Homes. 7.4 Requirements for Egress Windows and Devices for Use in Manufactured Homes. 7.5 Requirements for Swinging Exterior Passage Doors for Use in Manufactured Homes. 7.6 Air Chamber Test Method for Certification and Qualification of Formaldehyde Emission Levels. Chapter 8 Thermal Protection 8.1 Scope. 8.2 Definitions. 8.3 Materials. 8.4 Condensation Control and Installation of Vapor Retarders. 8.5 Air Infiltration. 8.6 Heat Loss/Heat Gain. 8.7 Comfort Heat Gain. 8.8 Heat Loss, Heat Gain, and Cooling Load Calculations. 8.9 Criteria in Absence of Specific Data. 8.10 Heat Loss Certificate. 8.11 Comfort Cooling Certificate and Information. Chapter 9 Plumbing Systems 9.1 Scope. 9.2 Definitions. 9.3 General Requirements. 9.4 Materials. 9.5 Joints and Connections. 9.6 Traps and Cleanouts. 9.7 Plumbing Fixtures. 9.8 Hangers and Supports. 9.9 Water Distribution Systems. 9.10 Drainage Systems. 9.11 Vents and Venting. 9.12 Tests and Inspection. Chapter 10 Heating, Cooling, and Fuel-Burning Systems 10.1 Scope. 10.2 Definitions. 10.3 Minimum Standards. 10.4 Gas Piping Systems. 10.5 Oil Piping Systems. 10.6 Heat-Producing Appliances. 10.7 Exhaust Duct System and Provisions for the Future Installation of a Clothes Dryer. 10.8 Installation of Appliances. 10.9 Venting, Ventilation, and Combustion Air. 10.10 Instructions. 10.11 Marking. 10.12 Accessibility. 10.13 Cooling Appliances. 10.14 Circulating Air System. Chapter 11 Electrical Systems 11.1 Scope. 11.2 Definitions. 11.3 Power Supply. 11.4 Disconnecting Means and Branch-Circuit Protective Equipment. 11.5 Branch Circuits Required. 11.6 Receptacle Outlets. 11.7 Fixtures and Appliances. 11.8 Wiring Methods and Materials. 11.9 Grounding. 11.10 Electrical Testing. 11.11 Calculations. 11.12 Wiring of Expandable Units and Multi-Wide Units. 11.13 Outdoor Outlets, Fixtures, Air-Conditioning Equipment, and Other Equipment. 11.14 Painting. 11.15 Polarization. 11.16 Examination of Equipment for Safety. Chapter 12 Transportation 12.1 Scope. 12.2 Definitions. 12.3 General Requirements. 12.4 System Requirements. 12.5 System Component Requirements. Chapter 13 Special Construction Consideration 13.1 Scope. 13.2 Definitions. 13.3 Dwelling Unit Separation. 13.4 Exterior Walls. 13.5 Electrical Service. 13.6 Water Service. 13.7 Safe Rooms. 14.4 References for Extracts in Mandatory Sections. Annex A Explanatory Material Annex B Structural Calculation Guidelines for In-Transit Conditions for Manufactured Homes Annex C Transportation Road Test Protocol Guidelines Annex D Informational References

This standard shall cover all the equipment and installations used in the design, construction, transportation, ƒre safety, plumbing, heat-producing, and electrical systems of manufactured homes that are designed to be used as dwelling units.