NFPA 79: Electrical Standard for Industrial Machinery

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2015 NFPA 79
2015 NFPA 79 Handbook
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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)

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

Author: Mark Cloutier

Get up-to-date on industrial machinery safety and compliance with the electronic 2015 NFPA 79 Handbook. Save 15% on the Standard and Handbook Set!

NFPA 79's requirements have changed. Apply the new best practices for the full spectrum of industrial equipment -- from single-motored drill presses to complex automated manufacturing systems -- with the 2015 NFPA 79: Electrical Standard for Industrial Machinery Handbook. This powerful format spells out essential protection for operators, equipment, facilities, and work-in-progress through updated commentary on the "whys" behind the rules.

The NFPA 79 Handbook includes the full text of the Standard, new explanations, and full-color imagery.

  • Gain electronic access to the complete 2015 NFPA 79 text, including revisions that correlate with the National Electrical Code® (NEC®), NFPA 70E®: Standard for Electrical Safety in the Workplace®, and IEC 60204-1. NFPA 79's 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.
  • Hyperlinked icons take you to annotations that answer questions and help you avoid oversights. Link directly to all-new commentary written by experts with in-depth knowledge of NFPA 79.
  • Link to exclusive full-color images not in the Standard.
  • Get the big picture with a dedicated Table of Contents for sections with annotations.
  • Find new chapter introductions only in the Handbook.
  • Save time with instant searches and interactive PDF functionality.

The Handbook provides safety managers, electrical designers, engineers, installers, owners, AHJs, and equipment manufacturers with background and rationale that can improve NFPA 79 application and compliance. After initial download, no Internet access is required. (PDF, Approx. 115 pp., 2015)

Best Value: Save 15% on the authoritative 2015 NFPA 79 and Handbook Set.

Purchase both the 2015 NFPA 79 Standard and its Handbook for the best access to industry essentials at the best price. This Set put requirements and expert answers at your command 24/7, so you can mitigate electrical hazards by understanding NFPA 79's intent and correct application. (Standard, Approx. 98 pp., 2015; Handbook PDF, Approx. 115 pp, 2015)