2015 NFPA 79 Standard - Current Edition

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  • Description

    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.

  • Table of Contents (2015 Edition)
    NFPA<sup>®</sup> 79 Electrical Standard for Industrial Machinery 2015 Edition

    NFPA® 79 Electrical Standard for Industrial Machinery, 2015 Edition

    Chapter 1 Administration
    1.1 Scope
    1.2 Purpose
    1.3 Application
    1.4 Specific Provisions Other Than 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 Operating Conditions
    4.1 General Considerations
    4.2 Electrical Components and Devices
    4.3 Electrical Supply
    4.4 Physical Environment and Operating Conditions
    4.5 Transportation and Storage
    4.6 Provisions for Handling
    4.7 Installation and Operating Conditions
    4.8 Available Fault Current
    Chapter 5 Incoming Supply Circuit Conductor Terminations and Devices for Disconnecting and Removing Power
    5.1 Incoming Supply Circuit Conductor Terminations
    5.2 Grounding Terminal
    5.3 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 Contact
    6.3 Protection Against Electric Shock from Indirect Contact (Fault Conditions)
    6.4 Protection by the Use of Protective Extra Low Voltage (PELV)
    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
    8.1 General
    8.2 Equipment Grounding Circuit
    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
    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 Circuit
    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
    Index
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    NFPA®'s Redline PDF contains both the current NFPA document and a Redline version of the document which shows changes from the previous edition marked in color. With the Redline you can quickly spot changed sections and tell specifically what has been changed from the previous edition, saving time and confusion.

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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