The MART Corporation - Technology - General - Electrical System - ANSI/NFPA 79 Codes

 

nfpa 79 applications

For applications where the cables required on a machine are not addressed in nFPa, Section allows machine builders to follow nEC, article For example, in communication applications, UL type CMG is allowed under nEC article , but it must meet the stranding criteria referenced in the nFPa standard. not all UL Listed cables meet. NFPA 79, The Electrical Standard for Industrial Machinery—has recently been updated from its prior publication and holds a new key clause for our VFD users. This VFD Cabling section is worthwhile to pay attention to this year because the potential impact for users and installers can be profound - . NFPA 79 was written to overcome the shortcomings of the NEC. The American National Standards Institute and the National Fire Protection Association (ANSI/NFPA) Codes provide specific requirements that render machinery safe and reliable by minimizing or .


Buy NFPA Electrical Standard for Industrial Machinery


The increase in variable frequency drives VFDs over the past decade has resulted in the need for specifically engineered wire and cable solutions to achieve long-term performance and operation. Many industry groups, standards, nfpa 79 applications, and specifications exist to advise VFD cable system designs and use. The latest version of NFPA 79 establishes very specific wire and cable requirements for VFD applications, accumulating decades of industry experience into a design document.

Thermoplastics exhibit a higher dielectric constant and a lower resistance to corona inception voltage. High dielectric constant results in higher cable capacitance and higher charging currents, which can be electrically demanding to the insulation over time. Lower resistance to corona inception can lead to premature dielectric breakdown, which results in cable failure. In addition to these issues, thermoplastic insulations do not perform well in DC applications or in applications such as VFDs that mimic the function of a DC circuit.

Also, thermoplastic insulations can deform and melt when exposed to excessive temperatures, such as those that occur electrically when standing voltage waves exist within a VFD cable circuit. Shielded cables, multiple grounds, tight construction geometry tolerance, and termination methods are all critical to long-term viability and performance of the VFD circuit.

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NFPA Electrical Standard for Industrial Machinery

 

nfpa 79 applications

 

For applications where the cables required on a machine are not addressed in nFPa, Section allows machine builders to follow nEC, article For example, in communication applications, UL type CMG is allowed under nEC article , but it must meet the stranding criteria referenced in the nFPa standard. not all UL Listed cables meet. * Scope. A In this standard, the term electrical includes both electrical and electronic equipment. Requirements that apply only to electronic equipment are so identified. The general terms machine and machinery as used throughout this standard mean industrial machinery. See Annex C for examples of industrial machines covered by this standard. NFPA 79 was written to overcome the shortcomings of the NEC. The American National Standards Institute and the National Fire Protection Association (ANSI/NFPA) Codes provide specific requirements that render machinery safe and reliable by minimizing or .