TABLE OF CONTENTS CHAPTER 5 SPECIAL OCCUPANCIES CHAPTER 1 GENERAL RULES... 19

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1 TABLE OF CONTENTS About This Textbook...xiii 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 Enforcement Mandatory Requirements and Explanatory Material Formal Interpretations Examination of Equipment for Product Safety Units of Measurement Article 90 Practice Questions CHAPTER 1 GENERAL RULES Article 100 Definitions Part I. General Definitions Article 110 Requirements for Electrical Installations Part I. General Requirements Scope Approval of Conductors and Equipment Examination, Identification, Installation, Use, and Product Listing (Certification) of Equipment Voltages Conductor Material Conductor Sizes Wiring Integrity Suitable Wiring Methods Interrupting Overcurrent Protection Rating Equipment Short-Circuit Current Rating Deteriorating Agents Mechanical Execution of Work Mounting and Cooling of Equipment Conductor Termination and Splicing High-Leg Conductor Identification Arc Flash Hazard Warning Markings Identification of Disconnecting Means Available Fault Current Lockable Disconnecting Means Part II. 1,000V, Nominal, or Less Spaces About Electrical Equipment Guarding Enclosure Types Chapter 1 Practice Questions CHAPTER 5 SPECIAL OCCUPANCIES Article 500 Hazardous (Classified) Locations Scope Articles 500 Through Other Articles General Classifications of Locations Material Groups Protection Techniques Equipment Specific Occupancies Article 501 Class I Hazardous (Classified) Locations Part I. General Scope Part II. Wiring Wiring Methods Raceway and Cable Seals Conductor Insulation Grounding and Bonding Part III. Equipment Transformers and Capacitors Meters, Instruments, and Relays Enclosures Mike Holt Enterprises NEC.CODE ( ) v

2 Control Transformers and Relays Motors Luminaires Utilization Equipment Flexible Cords Receptacles and Attachment Plugs Limited-Energy and Communications Systems Article 502 Class II Hazardous (Classified) Locations Part I. General Scope Explosionproof Equipment Part II. Wiring Wiring Methods Seals Grounding and Bonding Part III. Equipment Switches, Circuit Breakers, Motor Controllers, and Fuses Control Transformers Motors Luminaires Flexible Cords Receptacles and Attachment Plugs Limited Energy and Communications Systems Article 503 Class III Hazardous (Classified) Locations Part I. General Scope General Part II. Wiring Wiring Methods Grounding and Bonding Part III. Equipment Switches, Circuit Breakers, Motor Controllers, and Fuses Control Transformers Motors Luminaires Flexible Cords Receptacles and Attachment Plugs Limited Energy and Communications Systems Article 511 Commercial Garages, Repair and Storage Scope Definitions Classification of Hazardous Areas Wiring and Equipment in Hazardous (Classified) Locations Wiring and Equipment Above Hazardous (Classified) Locations Underground Wiring Seals Special Equipment GFCI Protected Receptacles Article 514 Motor Fuel Dispensing Facilities Scope Definition Classification of Locations Wiring and Equipment Within Class I Locations Wiring and Equipment Above Class I Locations Underground Wiring Raceway Seal Circuit Disconnects Maintenance and Service of Dispensing Equipment Grounding and Bonding Article 517 Health Care Facilities Part I. General Scope Definitions Part II. Wiring and Overcurrent Protection Applicability Wiring Methods Grounding of Equipment in Patient Care Spaces Isolated Ground Receptacles General Care (Category 2) Spaces Article 518 Assembly Occupancies Scope General Classifications Other Articles Wiring Methods vi Mike Holt s Illustrated Guide to Understanding the 2017 National Electrical Code, Volume 2

3 Article 525 Carnivals, Circuses, Fairs, and Similar Events Part I. General Requirements Scope Definitions Other Articles Overhead Conductor Clearances Protection of Electrical Equipment Part II. Electric Power Sources Services Multiple Sources of Supply Part III. Wiring Methods Wiring Methods Rides, Tents, and Concessions Outdoor Portable Distribution or Termination Boxes GFCI Protected Receptacles and Equipment Part IV. Grounding and Bonding Equipment Bonding Equipment Grounding Portable Equipment Grounding Conductor Continuity Article 547 Agricultural Buildings Scope Definitions Wiring Methods Luminaires Equipotential Planes Article 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks Part I. General Scope Definitions General Requirements Part II. Mobile and Manufactured Homes Receptacle Outlets Wiring Methods and Materials AFCI Protection Part III. Services and Feeders Distribution Systems Allowable Demand Factors Service Disconnect Feeder Article 555 Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities Scope Definitions Ground Fault Protection Transformers Location of Service Equipment Electrical Connections Electrical Equipment Enclosures Load Calculations for Service and Feeder Conductors Wiring Methods and Installation Grounding Boat Receptacle Disconnecting Means Receptacles Repair Facilities Electric Shock Hazard Signage Article 590 Temporary Installations Scope Installations Time Constraints General Listing of Decorative Lighting Ground Fault Protection for Personnel Chapter 5 Practice Questions CHAPTER 6 SPECIAL EQUIPMENT Article 600 Electric Signs and Outline Lighting Scope Definitions Listing Markings Branch Circuits Disconnecting Means Grounding and Bonding Location Portable or Mobile Signs Ballasts, Transformers, Class 2 Power Sources, and Electronic Power Supplies Class 2 Power Sources Photovoltaic (PV) Powered Sign Mike Holt Enterprises NEC.CODE ( ) vii

4 Article 604 Manufactured Wiring Systems Scope Definition Listing Requirements Securing and Supporting Uses Permitted Construction Article 620 Elevators, Escalators, and Moving Walks Part I. General Scope Part II. Conductors Short Circuit Current Rating Part III. Wiring Branch Circuits for Machine Room/Machinery Space Branch Circuit for Hoistway Pit Lighting and Receptacles Part IV. Installation of Conductors Wiring in Elevator Hoistways and Machine Rooms Part VI. Disconnecting Means and Control Disconnecting Means Part IX. Grounding GFCI Protected Receptacles Article 625 Electric Vehicle Charging System Part I. General Scope Definitions Listed Part II. Equipment Construction Markings Part III. Installation Electric Vehicle Branch Circuit Overcurrent Protection Disconnecting Means Location Ventilation Article 630 Electric Welders Part I. General Scope Listing Part II. Arc Welders Ampacity of Supply Conductors Overcurrent Protection Disconnecting Means Part III. Resistance Welders Ampacity of Supply Conductor Overcurrent Protection Disconnecting Means Article 640 Audio Signal Processing, Amplification, and Reproduction Equipment Part I. General Scope Definitions Locations and Other Articles Protection of Electrical Equipment Mechanical Execution of Work Wiring Methods Audio Systems Near Bodies of Water Part II. Permanent Audio System Installations Use of Flexible Cords and Flexible Cables Wiring of Equipment Racks and Enclosures Number of Conductors in a Raceway Loudspeakers in Fire Resistance Rated Partitions, Walls, and Ceilings Article 645 Information Technology Equipment Scope Definitions Other Articles Special Requirements Supply Circuits and Interconnecting Cables Disconnecting Means Uninterruptible Power Supplies (UPS) System Grounding and Bonding Equipment Grounding and Bonding Article 680 Swimming Pools, Spas, Hot Tubs, Fountains, and Similar Installations Part I. General Requirements for Pools, Spas, Hot Tubs, and Fountains Scope Definitions viii Mike Holt s Illustrated Guide to Understanding the 2017 National Electrical Code, Volume 2

5 680.4 Approval of Equipment Grounding and Bonding Terminals Cord-and-Plug-Connected Equipment Overhead Conductor Clearance Electric Water Heaters Underground Wiring Equipment Rooms and Pits Maintenance Disconnecting Means Corrosive Environment Part II. Permanently Installed Pools General Motors Lighting, Receptacles, and Equipment Underwater Luminaires Junction Box, Transformer, or GFCI Enclosure Feeders Equipotential Bonding Specialized Equipment Gas Fired Water Heaters Part III. Storable Pools, Storable Spas, and Storable Hot Tubs General Pumps GFCI-Protected Receptacles Receptacle Locations Part IV. Spas and Hot Tubs General Emergency Switch for Spas and Hot Tubs Outdoor Installations Indoor Installations GFCI Protection Part V. Fountains General Luminaires, Submersible Pumps, and Other Submersible Equipment Bonding Methods of Equipment Grounding Cord-and-Plug-Connected Equipment Electric Signs in or Adjacent to Fountains GFCI Protection for Adjacent Receptacles Part VII. Hydromassage Bathtubs General GFCI Protection Other Electrical Equipment Accessibility Equipotential Bonding Part VIII. Electrically Powered Pool Lifts Equipment Approval Protection Bonding Switching Devices Article 695 Fire Pumps Scope Electric Power Source(s) Continuity of Power Transformers Power Wiring Voltage Drop Control Wiring Surge Protection Chapter 6 Practice Questions CHAPTER 7 SPECIAL CONDITIONS Article 700 Emergency Systems Part I. General Scope Definitions Tests and Maintenance Capacity Transfer Equipment Signs Surge Protection Part II. Circuit Wiring Wiring Part III. Sources of Power General Requirements Part IV. Circuits for Lighting and Power Loads on Emergency Branch Circuits Emergency Illumination Multiwire Branch Circuits Branch Circuit Emergency Lighting Transfer Switch Part VI. Overcurrent Protection Accessibility Ground-Fault Protection of Equipment Selective Coordination Mike Holt Enterprises NEC.CODE ( ) ix

6 Article 701 Legally Required Standby Systems Part I. General Scope Definitions Tests and Maintenance Capacity and Rating Transfer Equipment Signs Part II. Circuit Wiring Wiring Part III. Sources of Power General Requirements Part IV. Overcurrent Protection Accessibility Ground-Fault Protection of Equipment Selective Coordination Article 702 Optional Standby Systems Part I. General Scope Definition Capacity and Rating Transfer Equipment Signs Part II. Circuit Wiring Wiring Outdoor Generator Sets Article 725 Remote Control, Signaling, and Power Limited Circuits Part I. General Scope Definitions Other Articles Electrical Equipment Behind Access Panels Mechanical Execution of Work Abandoned Cable Safety-Control Equipment Circuit Requirements Part II. Class 1 Circuit Requirements Class 1 Circuit Classifications and Requirements Class 1 Circuit Overcurrent Protection Class 1 Circuit Overcurrent Device Location Class 1 Circuit Wiring Methods Conductors of Different Circuits in Same Cable, C able Tray, Enclosure, or Raceway Class 1 Circuit Conductors Number of Conductors in a Raceway Part III. Class 2 and Class 3 Circuit Requirements Power Sources for Class 2 and Class 3... Circuits Equipment Marking Wiring Methods on Supply Side of the Class 2 or Class 3 Power Source Wiring Methods on Load Side of the Class 2 or Class 3 Power Source Installation of Class 2 and Class 3 Cables Separation from Power Conductors Conductors of Different Circuits in Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly Support Transmission of Power and Data Applications of Class 2, Class 3, and PLTC Cables Part IV. Listing Requirements Listing and Marking of Equipment for Power and Data Transmission Listing and Marking of Class 2 and Class 3 Cables Article 760 Fire Alarm Systems Part I. General Scope Definitions Other Articles Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Abandoned Cable Fire Alarm Circuit Identification Fire Alarm Circuit Cables Extending Beyond a Building Fire Alarm Circuit Requirements Part III. Power-Limited Fire Alarm (PLFA) Circuits Power Sources for Fire Alarm Circuits Equipment Marking Wiring Methods on Load Side of Fire Alarm Power Source Installation of PLFA Cables in Buildings Separation from Power Conductors x Mike Holt s Illustrated Guide to Understanding the 2017 National Electrical Code, Volume 2

7 Fire Alarm Circuits, Class 2, Class 3, and Communications Circuits Support Applications of Listed Fire Alarm Cables (PLFA) Part IV. Listing Requirements Listing and Marking of Power Limited Fire Alarm Cables (PLFA) Article 770 Optical Fiber Cables and Raceways Part I. General Scope Definitions Other Articles Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Abandoned Cable Spread of Fire or Products of Combustion Part V. Installation Methods Within Buildings Raceways and Cable Routing Assemblies for Optical Fiber Cables Installation of Optical Fiber Cables Installation of Optical Fiber Cables and Electrical Conductors Applications of Listed Optical Fiber Cables Chapter 7 Practice Questions CHAPTER 8 COMMUNICATIONS SYSTEMS Article 800 Communications Circuits Part I. General Scope Definitions Other Articles Installation of Equipment Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Abandoned Cable Spread of Fire or Products of Combustion Part II. Wires and Cables Outside and Entering Buildings Unlisted Cables Entering Buildings Metallic Entrance Conduit Grounding Part III. Protection Primary Protection Part IV. Grounding Methods Cable and Primary Protector Bonding and Grounding Part V. Installation Methods Within Buildings Raceways and Cable Routing Assemblies Installation of Communications Cables, Raceways, and Cable Routing Assemblies Installation of Communications Wires, Cables, and Equipment Applications of Communications Cables, Communications Raceways, and Cable Routing Assemblies Dwelling Unit Communications Outlet Part VI. Listing Requirements Listing and Marking of Communications Wires and Cables Cable Routing Assemblies and Communications Raceways Article 810 Radio and Television Satellite Equipment Part I. General Scope Other Articles Community Television Antenna Antenna Lead-In Protectors Grounding Devices Part II. Receiving Equipment Antenna Systems Supports Avoid Contact with Conductors of Other Systems Metal Antenna Supports Grounding Clearances Antenna Discharge Unit Bonding Conductor and Grounding Electrode Conductors Part III. Amateur and Citizen Band Transmitting and Receiving Antenna Systems Other Sections Clearance on Building Antenna Discharge Units Bonding Conductor or Grounding Electrode Conductors Mike Holt Enterprises NEC.CODE ( ) xi

8 Article 820 Community Antenna Television (CATV) and Radio Distribution Systems (Coaxial Cable) Part I. General Scope Definitions Power Limitations Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Abandoned Cable Spread of Fire or Products of Combustion Part II. Coaxial Cables Outside and Entering Buildings Underground Coaxial Cables Entering Buildings Part III. Protection Grounding of the Outer Conductive Shield of Coaxial Cables Part IV. Grounding Methods Bonding and Grounding Methods Part V. Installation Methods Within Buildings Installation of Coaxial Cables Installation of Coaxial Cables and Equipment Applications of Coaxial Cables Part VI. Listing Requirements Listing and Marking of Coaxial Cables Chapter 8 Practice Questions FINAL EXAM A FINAL EXAM B INDEX About the Author About the Illustrator About the Mike Holt Team xii Mike Holt s Illustrated Guide to Understanding the 2017 National Electrical Code, Volume 2