NFPA 79: Electrical Standard for Industrial Machinery, 2018 Handbook Digital Edition


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In alignment with today's NEC®, the 2018 edition of NFPA 79 presents critical updates to the global benchmark for industrial machinery safety.

Guard against electrical incidents and unplanned shutdowns that could result in injury, damage, or loss with the latest edition of NFPA 79: Electrical Standard for Industrial Machinery. This must-have companion to both the National Electrical Code® (NEC) and NFPA 70E®: Standard for Electrical Safety in the Workplace® is continuously updated to address new technologies and their impact on electrical safety.

NFPA 79 spells out essential protection for operators, equipment, facilities, and work-in-progress. Compliance is vital to reduce risks.

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.

  • To correlate with the NEC, "600 volts" is replaced with "1000 volts".
  • Revised and new definitions reflect terminology in use today, and changes throughout the Standard align with these definitions.
  • The new title for Chapter 5: Disconnecting Means clarifies that this chapter covers all the supply circuit conductor terminations on the machine.
  • A new requirement specifies that the main disconnecting means must be marked "machine supply circuit disconnect" if it supplies multiple disconnecting means on the machine.
  • New Exception No. 2 to states that the machine supply circuit disconnecting means is permitted to be externally mounted up to 20 ft. (6 m) away.
  • A revision allows adjustable speed drives marked "suitable for output conductor protection" to have the rating of the short-circuit protective device (SCPD) determined by the drive's rated input current.
  • To correlate with the NEC, an added requirement in Section 7.8.1 requires a surge protection device (SPD).
  • Chapter 8's title is revised to include "Bonding."
  • Revisions to Chapter 8 clarify connection of the grounded conductor to the equipment grounding conductor; and that all parts of effective ground-fault current path must be capable of withstanding the highest thermal and mechanical stress that can be caused by fault currents.
  • Revisions in Chapter 11 clarify the peculiar working space condition of industrial machines and machine tools.

All stakeholders need NFPA 79 to help mitigate electrical hazards involving industrial machinery.

The latest edition of NFPA 79 is essential for safety managers, electrical designers, engineers, installers, owners, AHJs, and industrial machinery manufacturers. (Print, 106 pp., 2018)

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