Topic Track: MDA 
Session Topic: VFD Cabling and Changes in NFPA 79

The recently updated 2018 NFPA 79 electrical standard for industrial machinery requires the use of thermoset wiring types for installation on power conversion equipment such as variable frequency drives (VFDs) and variable speed drives.

Proper cabling, an often-underestimated component, is vital to the safe and proper function of a variable speed drive using pulse width modulation. Installers are often faced with lack of direction from equipment manufacturers or with conflicting requirements as different countries have different standards for wiring methods. But if the cable construction is not up to the job, it can cause the system to function improperly and raise safety issues due to premature cable failures and short circuits.

This presentation will analyze how the effects of pulse width modulation challenge the cable construction, what the NFPA 79 2018 edition is recommending, and what direction the industry is taking to address these issues.


Lutze Inc. designs and manufactures industrial cables and accessories for automation applications.

Lutze Inc., located in Charlotte, North Carolina, is the North American headquarters and a part of the Lutze International Group with experience in automation for more than 60 years.

Lutze Inc. has its North American production facility in Massachusetts. The products evolve around flexible and high flexing specialty cables for control, electronic, bus, and network as well as motor, VFD, and servo applications.

Lutze product specialists understand the relevant industry codes, standards, and regulations and specify state-of-the-art products meeting and exceeding these requirements.

IMTS 2018 Booth #134033
www.lutze.com