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Robotics Tech Papers

NFPA 79 (New 2018) Electrical Standard for Industrial Machinery

by LAPP USA, Marketing
Lapp USA

It is important to be aware that the new electrical standard for industrial machinery is covered in both the NFPA 70 and NFPA 79.  

NFPA 70 - The National Electrical Code (NEC) is a standard, which covers the installation of electrical conductors, equipment, and raceways; signaling and communication conductors, equipment, and raceways; and optical fiber cables and raceways for residential premises, commercial buildings, and industrial facilities. This code is not intended as a design specification or an instruction manual for untrained persons.

NFPA 79 is the U.S. Electrical Standard for Industrial  Machinery and is referenced by the National Electrical Code under Article 670. NFPA 79 applies to the electrical equipment used within a wide variety of machines—and groups of machines operating in a coordinated manner.

While previous NFPA 79 editions reference wire and cable primarily in Chapters 12 and 13, the 2018 Edition of NFPA 79 refers to cable in Chapter 4, General Requirements and Operating Conditions. This chapter directly corresponds to the  conditions surrounding variable frequency and servo drive systems.

“Electrical conductors and equipment supplied by power conversion equipment as part of adjustable speed drive systems shall be listed flexible motor supply cable marked RHH, RHW, RHW-2, XHH, XHHW, or XHHW-2 or selected  based on the equipment manufacturers instructions.”
–Circuits Supplied From Power Conversion Equipment, Chapter 4, Section, NFPA 79 2018

**Note: This new revision to the NFPA 79 Code (2018) supports the use of high performing cable insulation to reduce safety concerns in these applications. In particular the revision not only applies to the conductors listed but also other materials based on the equipment manufacturers’ instructions.**

LAPP offers a variety of cables designed specifically to meet the technical and compliance requirements of variable frequency drives (VFD) and servo drives.  These VFD and servo cables are composed entirely from high-quality materials that meet or exceed the standards set by leading drive and motor manufacturers—including Allen-Bradley® and SIEMENS®.

LAPP’s extensive research, development and testing programs ensure that our full line of UL-listed cables not only meet or exceed NFPA 79 2018 standards but also offer best-of-class EMI protection, oil resistance and flexibility.**

Allen-Bradley® is a registered trademark of Rockwell Automation, Inc. SIEMENS® is a registered trademark of SIEMENS AG.

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