TABLE OF CONTENTS CHAPTER 1 GENERAL RULES CHAPTER 2 WIRING AND PROTECTION... 51

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1 TABLE OF CONTENTS About This Textbook...xi How to Use the National Electrical Code... 1 Article 90 Introduction to the National Electrical Code Purpose of the NEC Scope of the NEC Code Arrangement Examination of Equipment for Product Safety CHAPTER 1 GENERAL RULES Article 100 Definitions Definitions Article 110 Requirements for Electrical Installations Scope Examination, Identification, Installation, Use, and Product Listing (Certification) of Equipment Conductors Interrupting Overcurrent Protection Rating Available Short Circuit Current Deteriorating Agents Conductor Termination and Splicing Arc Flash Hazard Warning Markings Available Fault Current Spaces About Electrical Equipment CHAPTER 2 WIRING AND PROTECTION Article 210 Branch Circuits Scope Other Articles Multiwire Branch Circuits Identification for Branch Circuits Multiple Branch Circuits GFCI Protection Branch Circuits Required Arc Fault Circuit Interrupter Protection Branch Circuit Rating Dwelling Unit Receptacle Outlet Requirements Service Equipment Indoors Receptacle Lighting Outlet Requirements Meeting Rooms Article 215 Feeders Scope Minimum Rating Article 220 Branch Circuit, Feeder, and Service Load Calculations Scope General Lighting Determining Existing Loads Article 225 Outside Branch Circuits and Feeders Scope Masts as Supports Clearances from Buildings Raceways on Exterior Surfaces Raceway Seals Number of Feeder Supplies Type of Disconnecting Means Article 230 Services Scope Service Conductors Separate from Other Conductors Clearance from Building Openings Vegetation as Support Supports over Buildings Size and Rating Raceways to Drain Overhead Service Locations Marking for Service Equipment Mike Holt Enterprises NEC.CODE ( ) v

2 Connected on Supply Side of the Service Disconnect Location Article 240 Overcurrent Protection Scope Standard Ampere Ratings Location of Overcurrent Protection Devices Arc Energy Reduction Article 250 Grounding and Bonding Scope Performance Requirements for Grounding and Bonding Earth Shells Objectionable Current Objectionable Current Dangers of Objectionable Current Service Equipment Grounding and Bonding Separately Derived Systems Grounding and Bonding Grounding Electrode Types Grounding Electrode Installation Requirements Measuring the Ground Resistance Soil Resistivity Lightning Protection Electrode Grounding Electrode Conductor Installation Sizing Grounding Electrode Conductor Termination to the Grounding Electrode Service Raceways and Enclosures Other Enclosures Bonding Communications Systems Grounded Conductor, Bonding Conductors, and Jumpers Bonding of Piping Systems and Exposed Structural Metal Types of Equipment Grounding Conductors Sizing Equipment Grounding Conductor Continuity and Attachment of Equipment Grounding Conductors in Metal Boxes CHAPTER 3 WIRING METHODS AND MATERIALS Article 300 General Requirements for Wiring Methods and Materials Scope Conductors Underground Installations Raceways Exposed to Different Temperatures Securing and Supporting Mechanical Continuity Supporting Conductors in Vertical Raceways Wiring in Ducts and Plenums Spaces Article 310 Conductors for General Wiring Scope Uses Permitted Conductor Ampacity Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures Scope Overcurrent Protection Device Enclosures Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; and Handhole Enclosures Scope Damp or Wet Locations Number of Conductors in Boxes and Conduit Bodies Conductors That Enter Boxes or Conduit Bodies Flush Mounted Box Installations Support of Boxes and Conduit Bodies Outlet Box Sizing Boxes and Conduit Bodies Conductors 4 AWG and Larger Article 320 Armored Cable (Type AC) Scope Listing Requirements Securing and Supporting Article 330 Metal Clad Cable (Type MC) Scope Listing Requirements Exposed Work Securing and Supporting Article 334 Nonmetallic Sheathed Cable (Types NM and NMC) Scope vi Mike Holt s Illustrated Guide to Changes to the National Electrical Code 2017

3 334.6 Listing Requirements Uses Not Permitted Securing and Supporting Article 336 Power and Control Tray Cable (Type TC) Scope Listing Requirements Uses Permitted Article 338 Service Entrance Cable (Types SE and USE) Scope Listing Requirements Uses Permitted Article 340 Underground Feeder and Branch Circuit Cable (Type UF) Scope Listing Requirements Article 342 Intermediate Metal Conduit (Type IMC) Scope Uses Permitted Article 344 Rigid Metal Conduit (Type RMC) Scope Uses Permitted Dissimilar Metals Article 348 Flexible Metal Conduit (Type FMC) Scope Securing and Supporting Article 350 Liquidtight Flexible Metal Conduit (Type LFMC) Scope Trimming Securing and Supporting Article 356 Liquidtight Flexible Nonmetallic Conduit (Type LFNC) Scope Securing and Supporting Article 358 Electrical Metallic Tubing (Type EMT) Scope Uses Permitted Article 362 Electrical Nonmetallic Tubing (Type ENT) Scope Securing and Supporting Article 376 Metal Wireways Scope Conductors Connected in Parallel Number of Conductors and Ampacity Splices, Taps, and Power Distribution Blocks Article 392 Cable Trays Scope Number of Conductors or Cables CHAPTER 4 EQUIPMENT FOR GENERAL USE Article 400 Flexible Cords and Flexible Cables Scope Uses Not Permitted Article 404 Switches Scope Switch Connections Switch Faceplates Electronic Lighting Switches Article 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps) Scope Definitions Receptacle Rating and Type General Installation Requirements Receptacle Mounting Receptacle Faceplates Tamper Resistant Receptacles Mike Holt Enterprises NEC.CODE ( ) vii

4 Article 408 Switchboards, Switchgear, and Panelboards Scope Field Identification Article 410 Luminaires, Lampholders, and Lamps Scope Cord Connected Luminaires Article 411 Low Voltage Lighting Scope Article 445 Generators Scope Ampacity of Conductors Disconnecting Means and Shutdown of Prime Mover GFCI for Receptacles on 15 kw or Smaller Portable Generators Article 480 Storage Batteries Scope Listing Requirement Battery and Cell Terminations Battery Support Systems Article 422 Appliances Scope Ground Fault Circuit Interrupter (GFCI) Protection for Personnel Listing Required Flexible Cords Support of Ceiling Paddle Fans Covering of Combustible Material at Outlet Boxes Permanently Connected Appliance Disconnects Disconnection of Cord and Plug Connected or Attachment Fitting Connected Appliances Article 424 Fixed Electric Space Heating Equipment Scope Area Restrictions Clearance from Other Objects and Openings Article 430 Motors, Motor Circuits, and Controllers Scope Available Fault Current Article 440 Air Conditioning and Refrigeration Equipment Scope Grounding and Bonding Short Circuit Current Rating CHAPTER 5 SPECIAL OCCUPANCIES Article 500 Hazardous (Classified) Locations Scope Articles 500 Through Definitions Article 501 Class I Hazardous (Classified) Locations Scope Wiring Methods Raceway and Cable Seals Enclosures Receptacles and Attachment Plugs Article 511 Commercial Garages, Repair, and Storage Scope Classification of Hazardous Areas Underground Wiring Article 514 Motor Fuel Dispensing Facilities Scope Underground Wiring Raceway Seal Circuit Disconnects Article 517 Health Care Facilities Scope Definitions Grounding of Equipment in Patient Care Spaces Isolated Ground Receptacles viii Mike Holt s Illustrated Guide to Changes to the National Electrical Code 2017

5 Article 525 Carnivals, Circuses, Fairs, and Similar Events Scope GFCI Protected Receptacles and Equipment Article 547 Agricultural Buildings Scope Definitions Article 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks Scope Definitions Receptacle Outlets AFCI Protection Article 620 Elevators, Escalators, and Moving Walks Scope Short Circuit Current Rating Branch Circuit for Machine Room/Machinery Space Branch Circuit for Hoistway Pit Lighting and Receptacles Disconnecting Means GFCI Protected Receptacles Article 625 Electric Vehicle Charging System Scope Definitions Listed Electric Vehicle Branch Circuit Article 555 Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities Scope Ground Fault Protection Electric Shock Hazard Signage Article 590 Temporary Installations Scope General Ground Fault Protection for Personnel CHAPTER 6 SPECIAL EQUIPMENT Article 600 Electric Signs and Outline Lighting Scope Definitions Listing Markings Disconnecting Means Class 2 Power Sources Photovoltaic (PV) Powered Sign Article 604 Manufactured Wiring Systems Scope Listing Requirements Article 630 Welders Scope Listing Article 640 Audio Signal Processing, Amplification, and Reproduction Equipment Scope Locations and Other Articles Wiring of Equipment Racks and Enclosures Loudspeakers in Fire Resistance Rated Partitions, Walls, and Ceilings Article 645 Information Technology Equipment Scope Other Articles Special Requirements Supply Circuits and Interconnecting Cables Article 680 Swimming Pools, Spas, Hot Tubs, Fountains, and Similar Installations Scope Definitions Approval of Equipment Grounding and Bonding Terminals Underground Wiring Equipment Rooms and Pits Corrosive Environment Motors Mike Holt Enterprises NEC.CODE ( ) ix

6 Lighting, Receptacles, and Equipment Underwater Luminaires Feeders Equipotential Bonding Gas Fired Water Heaters Outdoor Installations Equipotential Bonding Part VIII. Electrically Powered Pool Lifts Listing and Marking of Power Limited Fire Alarm Cables (PLFA) and Insulated Continuous Line Type Fire Detectors Article 770 Optical Fiber Cables and Raceways Scope Definitions Mechanical Execution of Work Article 695 Fire Pumps Scope Control Wiring Surge Protection CHAPTER 7 SPECIAL CONDITIONS Article 700 Emergency Systems Scope Tests and Maintenance Transfer Equipment Wiring General Requirements Branch Circuit Emergency Lighting Transfer Switch Article 701 Legally Required Standby Systems Scope Tests and Maintenance Transfer Equipment Article 702 Optional Standby Systems Scope Transfer Equipment Article 725 Remote Control, Signaling, and Power Limited Circuits Scope Other Articles Power Sources for Class 2 and Class 3 Circuits Transmission of Power and Data Listing and Marking of Class 2 and Class 3 Cables CHAPTER 8 COMMUNICATIONS SYSTEMS Article 800 Communications Circuits Scope Definitions Mechanical Execution of Work Cable and Primary Protector Bonding and Grounding Installation of Communications Wires, Cables, and Equipment Article 810 Radio and Television Satellite Equipment Scope Metal Antenna Supports Grounding Article 820 Community Antenna Television (CATV) and Radio Distribution Systems (Coaxial Cable) Scope Definitions Mechanical Execution of Work Bonding and Grounding Methods Installation of Coaxial Cables and Equipment FINAL EXAM About the Author About the Illustrator About the Mike Holt Team Article 760 Fire Alarm Systems Scope Other Articles x Mike Holt s Illustrated Guide to Changes to the National Electrical Code 2017