2018 NFPA 79 Standard - Current Edition

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  • Description

    Update to the 2018 NFPA 79 -- the benchmark for industrial machinery safety and vital companion to the NEC® and NFPA 70E®.


    Interested in other editions of the NFPA 79? Use the drop down menu above to select the edition year you need.

  • Table of Contents (2018 Edition)

    NFPA® 79 Electrical Standard for Industrial Machinery, 2018 Edition

    Chapter 1 Administration
    1.1 Scope.
    1.2 Purpose.
    1.3 Application.
    1.4 Specific Provisions Other Than NFPA 79.
    1.5 Specific Provisions Not Made in Relation to NFPA 70.
    1.6 State of the Art.
    Chapter 2 Referenced Publications
    2.1 General.
    2.2 NFPA Publications.
    2.3 Other Publications.
    2.4 References for Extracts in Mandatory Sections.
    Chapter 3 Definitions
    3.1 General.
    3.2 NFPA Official Definitions.
    3.3 General Definitions.
    Chapter 4 General Requirements and Operating Conditions
    4.1 General Considerations.
    4.2 Electrical Components and Devices.
    4.3 Installation and Use of Listed or Labeled Equipment.
    4.4 Electrical Supply.
    4.5 Physical Environment and Operating Conditions.
    4.6 Transportation and Storage.
    4.7 Provisions for Handling.
    4.8 Installation and Operating Conditions.
    4.9 Available Fault Current.
    Chapter 5 Disconnecting Means
    5.1 IncomingMachine Supply Circuit Conductor Terminations.
    5.2 Machine Supply Circuit Grounding Terminal.
    5.3 Machine Supply Circuit Disconnecting (Isolating) Means.
    5.4 Means for Removal of Power for Prevention of Unexpected Start-Up.
    5.5 Devices for Disconnecting (Isolating) Electrical Equipment.
    Chapter 6 Protection from Electrical Hazards
    6.1 General.
    6.2 Protection Against Direct ContactBasic Protection.
    6.3 Protection Against Electric Shock from Indirect Contact (Fault Conditions)Fault Protection.
    6.4 Protection by the Use of Protective Extra Low Voltage (PELV) or Class 2 Circuits.
    6.5 Protection Against Residual Voltages.
    6.6 Arc Flash Hazard Warning.
    Chapter 7 Protection of Equipment
    7.1 General.
    7.2 Overcurrent Protection.
    7.3 Overload Protection of Motors.
    7.4 Abnormal Temperature Protection.
    7.5 Protection Against Supply Interruption or Voltage Reduction and Subsequent Restoration.
    7.6 Overspeed Protection.
    7.7 Phase Sequence Protection.
    7.8 Protection Against Overvoltages Due to Lightning and Switching Surges.
    7.9 Power Factor Correction Capacitor Overcurrent Protection.
    Chapter 8 Grounding and Bonding
    8.1 General.
    8.2 Equipment Grounding CircuitConductors and Bonding Jumpers.
    8.3 Control Circuits.
    8.4 Lighting Circuits.
    Chapter 9 Control Circuits and Control Functions
    9.1 Control Circuits.
    9.2 Control Functions.
    9.3 Protective Interlocks.
    9.4 Control Functions in the Event of Failure.
    Chapter 10 Operator Interface and Control Devices
    10.1 General.
    10.2 Pushbutton Actuators and Color Graphic Interface Devices.
    10.3 Indicator Lights and Icons of Color Graphic Interface Devices.
    10.4 Illuminated Pushbuttons.
    10.5 Rotary Control Devices.
    10.6 Start Devices.
    10.7 Devices for Stop and Emergency Stop.
    10.8 Devices for Emergency Switching Off.
    10.9 Displays.
    Chapter 11 Control Equipment: Location, Mounting, and Enclosures
    11.1 General Requirements.
    11.2 Location and Mounting.
    11.3 Degrees of Protection.
    11.4 Enclosures, Doors, and Openings.
    11.5 Spaces Around Control Cabinets and Compartments.
    Chapter 12 Conductors, Cables, and Flexible Cords
    12.1 General Requirements.
    12.2 Conductors.
    12.3 Insulation.
    12.4 Wire Markings.
    12.5 Conductor Ampacity.
    12.6 Conductor Sizing.
    12.7 Conductors and Cables Used for Flexing Applications.
    12.8 Cords.
    12.9 Special Cables and Conductors.
    Chapter 13 Wiring Practices
    13.1 Connections and Routing.
    13.2 Identification of Conductors.
    13.3 Wiring Inside Enclosures.
    13.4 Wiring Outside Enclosures.
    13.5 Raceways, Support Systems (Cable Supports), Connection Boxes, and Other Boxes.
    Chapter 14 Electric Motors and Associated Equipment
    14.1 General Requirements.
    14.2 Conductors Supplied from Separate Disconnects.
    14.3 Reserved.
    14.4 Motor Dimensions.
    14.5 Motor Mounting and Compartments.
    14.6 Criteria for Selection.
    14.7 Protective Devices for Mechanical Brakes.
    14.8 Direction Arrow.
    14.9 Marking on Motors.
    14.10 Motor Controllers.
    Chapter 15 Accessories and Lighting
    15.1 Accessories.
    15.2 Local Lighting of the Machine and Equipment.
    Chapter 16 Marking and Safety Signs
    16.1 General.
    16.2 Safety Signs for Electrical Enclosures.
    16.3 Function Identification.
    16.4 Machine Nameplate Data.
    16.5 Equipment Marking and Identification.
    Chapter 17 Technical Documentation
    17.1 General.
    17.2 Information to Be Provided.
    17.3 Requirements Applicable to All Documentation.
    17.4 Basic Information.
    17.5 Installation Diagram.
    17.6 Block (System) Diagrams and Function Diagrams.
    17.7 Circuit Diagrams.
    17.8 Operating Manual.
    17.9 Maintenance Manual.
    17.10 Parts List.
    Chapter 18 Testing and Verification
    18.1 General.
    18.2 Continuity of the Equipment Grounding CircuitEffective Ground-Fault Current Path.
    18.3 Insulation Resistance Tests.
    18.4 Voltage Tests.
    18.5 Protection Against Residual Voltages.
    18.6 Functional Tests.
    18.7 Retesting.
    Chapter 19 Servo Drives and Motors
    19.1 Overcurrent Protection for Drives and Servo Motors.
    19.2 Motor Overtemperature Protection.
    19.3 Servo Drive System Conductors.
    19.4 Contactor.
    19.5 Cable Shield.
    Annex A Explanatory Material
    Annex B Inquiry Form for the Electrical Equipment of Machines
    Annex C Examples of Industrial Machines Covered by NFPA 79
    Annex D Technical Documentation
    Annex E Device and Component Designations
    Annex F Electrical Enclosure Ratings: Type-Rating Versus IP-Rating
    Annex G Kilowatt Outputs with Horsepower Equivalents
    Annex H Minimizing the Probability of Control Function Failure
    Annex I AWG Conductor Cross-Reference Table
    Annex J Electrical Terms Defined
    Annex K Informational References
  • Prior Editions

    2015 Edition

    Update to the 2015 NFPA 79 -- the benchmark for industrial machinery safety and vital companion to the NEC® and NFPA 70E®.

    Guard against electrical incidents and unplanned shutdowns that could result in injury, damage, or loss with the 2015 edition of NFPA 79: Electrical Standard for Industrial Machinery. Updated to address new technologies and to correlate with the National Electrical Code® (NEC) and NFPA 70E®: Standard for Electrical Safety in the Workplace®, the 2015 NFPA 79 spells out essential protection for operators, equipment, facilities, and work-in-progress. This edition presents the latest requirements for the full spectrum of equipment -- from single-motored drill presses to complex automated manufacturing systems.

    Updates address concerns from the industry and key changes to companion Standards.

    • Requirements align with IEC 60204-1.
    • Section 6.6, Arc Flash Hazard Warning clarifies that the requirement is to warn, not to protect, qualified individuals of a potential arc flash hazard. This change aligns with the 2014 NEC revision to 110.16.
    • Conditions for "emergency stop" and "emergency switching off" are revised for Category 1 and Category 0 stops.
    • The rules have been clarified where separate supply sources are used.
    • Working space rules for enclosures that contain supply conductors have been revised to clarify that the requirements in 110.26 of the NEC apply.
    • Requirement for "width of the working space" has been revised to specify the opening into the control cabinet to help users avoid dangerous errors.

    All stakeholders need to help mitigate electrical hazards involving industrial machinery.

    The 2015 NFPA 79 is essential for safety managers, electrical designers, engineers, installers, owners, AHJs, and industrial machinery manufacturers. (Softbound, 98 pp., 2015)


    Interested in other editions of the NFPA 79? Use the drop down menu above to select the edition year you need.

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    Sample (NEC® 2014)

    411.2411.3 Definition. Low-Voltage Lighting Systems.


    (A) General. Lighting Ssystems Ooperating at 30 Volts- volts or  Less. A lighting system consisting less shall consist of an isolating power supply, the low-voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply are shall be rated for not more than 25 amperes and  operate at 30 volts (42.4 volts peak) or lessmaximum under all load conditions.


    (B) Class 2. Listed Class 2 lighting equipment shall be rated in conformance with Chapter 9, Table 11(A) or Table 11(B).


    411.3411.4 Listing Required. Lighting systems operating at 30 volts or less shall comply with 411.3(A)411.4(A) or 

    411.3(B).411.4(B). Class 2 power sources and lighting equipment connected to Class 2 power sources shall be llisted.

  • Also in NFPA 79: Electrical Standard for Industrial Machinery