Code Change Summary: New definition of a Limited Energy Cable added to Article 100.

SME commentary: The 2026 NEC^® introduces a new definition for "Limited-Energy Cable" in Article 100, a much-needed clarification aimed at standardizing the terminology surrounding limited-energy systems. This change provides an all-encompassing term that simplifies code application and enhances usability across multiple NEC^® articles in Chapter 7 pertaining to communications, power-limited fire alarm systems, optical fiber circuits, and Class 2, Class 3, and Class 4 circuits.

In the 2026 NEC^®, Article 100 now defines a Limited-Energy Cable as a factory made assembly of one or more conductors or optical fibers used for any of the following:

• Class 2 circuits
• Class 3 circuits
• Class 4 circuits
• Optical fiber systems
• Communications circuits
• Community antenna television circuits (CATV)
• Network-powered broadband low-power communications circuits
• Premises communications circuits
• Power-limited fire alarm circuits

Prior to this revision, multiple NEC^® articles referenced these cables individually, creating potential confusion regarding which rules applied to which types of cables. By establishing a unified definition, the NEC^® eliminates ambiguity, enhances code usability, and simplifies the language and application of limited-energy articles.

This definition ensures that all qualifying low-voltage cables are recognized under the limited-energy umbrella, streamlining compliance and making it easier for designers, installers, and inspectors to apply NEC^® requirements consistently. This update reflects the NEC’s ongoing commitment to clarity and modernization, addressing evolving electrical systems and their unique installation needs.

Below is a preview of the NEC^®. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2026 NEC^® edition of NFPA 70.

2023 Code Language:

Article 100 Definitions.

The definition did not exist.

2026 Code Language:

Article 100 Definitions.

N Cable, Limited-Energy. (Limited-Energy Cable) A factory made assembly of one or more conductors or optical fibers used for any of the following:

(1) Class 2 circuits

(2) Class 3 circuits

(3) Class 4 circuits

(4) Optical fiber systems

(5) Communications circuits

(6) Community antenna television circuits (CATV)

(7) Network-powered broadband low-power communications circuits

(8) Premises communications circuits

(9) Power-limited fire alarm circuits