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725.48(B)(1) Class 1 Circuits and Power-Supply Circuits

Revision

Change Summary

  • Revision permits Class 1 circuits to share enclosure space with conductors of electric light, power, non–power-limited fire alarm and medium power network-powered broadband communications circuits as long as separated by a barrier.
NEC® Text

725.48 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway.
Class 1 circuits shall be permitted to be installed with other circuits as specified in 725.48(A) and (B).
(A) Two or More Class 1 Circuits.
(see NEC for complete Code text)
(B) Class 1 Circuits with Power-Supply Circuits. Class 1 circuits shall be permitted to be installed with power-supply conductors as specified in 725.48(B)(1) through (B)(4).
(1) In a Cable, Enclosure, or Raceway.Class 1 circuits and power-supply circuits shall be permitted to occupy the same cable, enclosure, or raceway without a barrier only where the equipment powered is functionally associated. Class 1 circuits shall be permitted to be installed together with the conductors of electric light, power, non-powerlimited fire alarm, and medium power network-powered broadband communications circuits where separated by a barrier.

Material taken from the National Electric Code® is reprinted with permission from NFPA 70®, 2020 edition.
National Electrical Code®, Copyright 2019, National Fire Protection Association, Quincy, MA. All rights reserved.

Expert Analysis

For the 2020 NEC, in an effort to match the already-inplace allowances for Class 2 and Class 3 circuits, Code language was put in place to allow Class 1 circuits to be installed together with the conductors of electric light, power, non-power limited fire alarm, and medium power network-powered broadband communications circuits “where separated by a barrier.” An example of this would be when the power supply conductors and Class 1 control circuit conductors are run in the same conduit to control panel and operate the same piece of equipment, such as a motor controller.

 

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