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2021 NFPA 79 Electrical Standard for Industrial Machinery

Product Code/ISBN: NFPA 79-21

To align with today's NEC®, the 2021 edition of NFPA 79, Electrical Standard for Industrial Machinery, holds critical updates to the global benchmark for industrial machinery safety.

To help prevent electrical incidents and unplanned shutdowns that could result in injury, damage, or loss, be prepared 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 newly updated to contend with new technologies and their effects on electrical safety.

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

The 2021 edition includes updates for requirements that deal with 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 codes and standards, including the following:

  • Requirements involving supply circuit disconnecting means, access, operations, and markings are enhanced.
  • Electromagnetic compatibility (EMC) involving transients are revised.
  • Requirements on enclosure access and interlocking are changed.
  • Voltage limitations and rejection capabilities for attachment plugs in protective extra low voltage (PELV) systems are revised.
  • Language requiring surge-protection devices (SPDs) is updated.
  • The exception involving insulation monitoring for Class 2 circuits is changed.
  • Control system grounding requirements are updated.
  • Emergency stop devices are now to be listed.
  • Requirements for conductors and equipment supplied by power conversion equipment are updated.
  • References to 50 volts rms ac and 60 volts dc revised for clarity and consistency.

Order NFPA 79, Electrical Standard for Industrial Machinery, to help mitigate electrical hazards involving industrial machinery.