NFPA 70, National Electrical Code (NEC), 2020 Code Looseleaf

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Prepare for the electrical challenges of tomorrow, today, with NFPA 70, National Electrical Code (NEC), 2020 edition.

The world never stops changing, so it's crucial to keep learning how to keep it safe. Incorporated by reference in all 50 states and used across the globe, NFPA 70®, National Electrical Code® (NEC®), is the benchmark standard for electrical safety in residential, commercial, and industrial settings.

NFPA 70, NEC, was first published in 1897 and is continually put through a rigorous review process to keep it up to date with the most current industry practices, emerging trends, and the development and introduction of new technologies. The new NEC provides the latest requirements for safer and more effective electrical design, installation, and inspection, including provisions for wiring, overcurrent protection, grounding, and equipment.

Get up-to-code and prepared for the safety challenges of new sources of electrical power with the NEC, 2020 edition.

The revised and expanded NFPA 70, National Electrical Code, features state-of-the-art information for safe electrical practices for public and private buildings, homes and structures, outdoor yards and lots, utility equipment, installations that connect to the power grid, and consumer-owned power generation systems and equipment.

Content has been added, edited, and reorganized to address safety for workers, energy systems and electric vehicles, limited energy, and communication systems.

Impactful changes include:

  • New requirements for exterior emergency disconnects of one- and two-family dwellings for improved electrical safety for emergency responders
  • Revisions to service disconnect rules to help protect electrical workers from arc flash hazards
  • Adapted and adjusted requirements for installation practices of new technologies to meet the evolving demand of power over Ethernet
  • Updates to modernize tables currently in use for calculations to reflect improvements in energy efficiency and align with evolving codes
  • Revised requirements for ground-fault protection within marinas and boatyards
  • Introduction of guidelines for the safe use of electric vehicles (electric vehicle power export equipment) as a backup or emergency power source for a building or a home
  • Reorganization of Article 310, including new user-friendly numbering for important ampacity tables, and new definition for cable bundle in Article 725
  • Relocation of surge protection device requirements to new Article 242
  • Revisions to alternative energy systems and electric vehicle requirements to clarify what portions of the PV system are covered by the requirements of Article 690 and the line side and load side connections of interconnected power supply sources, and to clearly distinguish energy storage systems from storage battery systems
  • Reorganization of Article 800 to provide a general set of requirements to apply throughout the Chapter 8 articles
  • Revisions to requirements for communications cables that are also carrying power to communication devices and revisions to the current limit for cables carrying power and data

The NEC, 2020 edition, introduces significant new requirements for:

  • The residential installation of receptacle outlets serving island and peninsular countertops and for surge protection of services supplying dwelling units
  • Working space for “housekeeping pads” for electrical equipment, the installation of wiring methods in exit enclosures, sizing supply and load conductors used with adjustable-speed drive systems, and AFCI protection of branch circuits in patient sleeping areas in care facilities
  • Calculating the load of electric vehicle supply equipment with variable current settings
  • Worker safety in identifying the source of power for disconnecting means and for egress from spaces containing large electrical equipment
  • Grounding of disconnecting means installed on the supply-side of service disconnecting means
  • Cables installed exposed on ceiling surfaces and sidewalls
  • Special occupancies, special equipment, and special conditions, including installation of splash pads, the use of “Type P” cables in hazardous classified locations, and the reinspection of swimming pools and other bodies of water

Help protect life and property with the most relevant electrical requirements.

Get the cutting edge information you need to identify and overcome the latest hazards and complexities in electrical work. Order your copy of NFPA 70®, National Electrical Code, 2020 edition, today.

Table of Contents:

NFPA 70® National Electrical Code®, 2020 Edition

90 Introduction
Chapter 1 General
100 Definitions
110 Requirements for Electrical Installations
Chapter 2 Wiring and Protection
200 Use and Identification of Grounded Conductors
210 Branch Circuits
215 Feeders
220 Branch-Circuit, Feeder, and Service Load Calculations
225 Outside Branch Circuits and Feeders
230 Services
240 Overcurrent Protection
242 Overvoltage Protection
250 Grounding and Bonding

Chapter 3 Wiring Methods and Materials
300 General Requirements for Wiring Methods and Materials
310 Conductors for General Wiring
311 Medium Voltage Conductors and Cable
312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
320 Armored Cable: Type AC
322 Flat Cable Assemblies: Type FC
324 Flat Conductor Cable: Type FCC
326 Integrated Gas Spacer Cable: Type IGS
330 Metal-Clad Cable: Type MC
332 Mineral-Insulated, Metal-Sheathed Cable: Type MI
334 Nonmetallic-Sheathed Cable: Types NM and NMC
336 Power and Control Tray Cable: Type TC
337 Type P Cable
338 Service-Entrance Cable: Types SE and USE
340 Underground Feeder and Branch-Circuit Cable: Type UF
342 Intermediate Metal Conduit: Type IMC
344 Rigid Metal Conduit: Type RMC
348 Flexible Metal Conduit: Type FMC
350 Liquidtight Flexible Metal Conduit: Type LFMC
352 Rigid Polyvinyl Chloride Conduit: Type PVC
353 High Density Polyethylene Conduit: Type HDPE Conduit
354 Nonmetallic Underground Conduit with Conductors: Type NUCC
355 Reinforced Thermosetting Resin Conduit: Type RTRC
356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC
358 Electrical Metallic Tubing: Type EMT
360 Flexible Metallic Tubing: Type FMT
362 Electrical Nonmetallic Tubing: Type ENT
366 Auxiliary Gutters
368 Busways
370 Cablebus
372 Cellular Concrete Floor Raceways
374 Cellular Metal Floor Raceways
376 Metal Wireways
378 Nonmetallic Wireways
380 Multioutlet Assembly
382 Nonmetallic Extensions
384 Strut-Type Channel Raceway
386 Surface Metal Raceways
388 Surface Nonmetallic Raceways
390 Underfloor Raceways
392 Cable Trays
393 Low-Voltage Suspended Ceiling Power Distribution Systems
394 Concealed Knob-and-Tube Wiring
396 Messenger-Supported Wiring
398 Open Wiring on Insulators
399 Outdoor Overhead Conductors over 1000 Volts
Chapter 4 Equipment for General Use
400 Flexible Cords and Flexible Cables
402 Fixture Wires
404 Switches
406 Receptacles, Cord Connectors, and Attachment Plugs (Caps)
408 Switchboards, Switchgear, and Panelboards
409 Industrial Control Panels
410 Luminaires, Lampholders, and Lamps
411 Low-Voltage Lighting
422 Appliances
424 Fixed Electric Space-Heating Equipment
425 Fixed Resistance and Electrode Industrial Process Heating Equipment
426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment
427 Fixed Electric Heating Equipment for Pipelines and Vessels
430 Motors, Motor Circuits, and Controllers
440 Air-Conditioning and Refrigerating Equipment
445 Generators
450 Transformers and Transformer Vaults (Including Secondary Ties)
455 Phase Converters
460 Capacitors
470 Resistors and Reactors
480 Storage Batteries
490 Equipment Over 1000 Volts, Nominal
Chapter 5 Special Occupancies
500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2
501 Class I Locations
502 Class II Locations
503 Class III Locations
504 Intrinsically Safe Systems
505 Zone 0, 1, and 2 Locations
506 Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers/Flyings
510 Hazardous (Classified) Locations - Specific
511 Commercial Garages, Repair and Storage
513 Aircraft Hangars
514 Motor Fuel Dispensing Facilities
515 Bulk Storage Plants
516 Spray Application, Dipping, Coating, and Printing Processes Using Flammable or Combustible Materials
517 Health Care Facilities
518 Assembly Occupancies
520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations
522 Control Systems for Permanent Amusement Attractions
525 Carnivals, Circuses, Fairs, and Similar Events
530 Motion Picture and Television Studios and Similar Locations
540 Motion Picture Projection Rooms
545 Manufactured Buildings and Relocatable Structures
547 Agricultural Buildings
550 Mobile Homes, Manufactured Homes, and Mobile Home Parks
551 Recreational Vehicles and Recreational Vehicle Parks
552 Park Trailers
555 Marinas, Boatyards, Floating Buildings, and Commercial and Noncommercial Docking Facilities
590 Temporary Installations
Chapter 6 Special Equipment
600 Electric Signs and Outline Lighting
604 Manufactured Wiring Systems
605 Office Furnishings
610 Cranes and Hoists
620 Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts
625 Electric Vehicle Charging System
626 Electrified Truck Parking Spaces
630 Electric Welders
640 Audio Signal Processing, Amplification, and Reproduction Equipment
645 Information Technology Equipment
646 Modular Data Centers
647 Sensitive Electronic Equipment
650 Pipe Organs
660 X-Ray Equipment
665 Induction and Dielectric Heating Equipment
668 Electrolytic Cells
669 Electroplating
670 Industrial Machinery
675 Electrically Driven or Controlled Irrigation Machines
680 Swimming Pools, Fountains, and Similar Installations
682 Natural and Artificially Made Bodies of Water
685 Integrated Electrical Systems
690 Solar Photovoltaic (PV) Systems
691 Large-Scale Photovoltaic (PV) Electric Supply Stations
692 Fuel Cell Systems
694 Wind Electric Systems
695 Fire Pumps
Chapter 7 Special Conditions
700 Emergency Systems
701 Legally Required Standby Systems
702 Optional Standby Systems
705 Interconnected Electric Power Production Sources
706 Energy Storage Systems
708 Critical Operations Power Systems (COPS)
710 Stand-Alone Systems
712 Direct Current Microgrids
720 Circuits and Equipment Operating at Less Than 50 Volts
725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
727 Instrumentation Tray Cable: Type ITC
728 Fire-Resistive Cable Systems
750 Energy Management Systems
760 Fire Alarm Systems
770 Optical Fiber Cables
Chapter 8 Communications Systems
800 General Requirements for Communications Systems
805 Communications Circuits
810 Radio and Television Equipment
820 Community Antenna Television and Radio Distribution Systems
830 Network-Powered Broadband Communications Systems
840 Premises-Powered Broadband Communications Systems
Chapter 9 Tables
Informative Annex A: Product Safety Standards
Informative Annex B: Application Information for Ampacity Calculation
Informative Annex C: Conduit, Tubing, and Cable Tray Fill Tables for Conductors and Fixture Wires of the Same Size
Informative Annex D: Examples
Informative Annex E: Types of Construction
Informative Annex F: Availability and Reliability for Critical Operations Power Systems; and Development and Implementation of Functional Performance Tests (FPTs) for Critical Operations Power Systems
Informative Annex G: Supervisory Control and Data Acquisition (SCADA)
Informative Annex H: Administration and Enforcement
Informative Annex I: Recommended Tightening Torque Tables from UL Standard 486A-B
Informative Annex J: ADA Standards for Accessible Design
Index