All About Class 1 Power-Limited Circuits: What's Different in 2023? 

In the ever-evolving world of the National Electrical Code (NEC), changes are inevitable. And for 2023, one of the most significant shifts comes in the way Class 1 power-limited circuits are addressed. Let’s unravel what's new. 

An Introduction to Article 724 

The 2023 edition of the NEC introduced us to Article 724. It’s a fresh addition specifically dedicated to Class 1 power-limited circuits. In previous editions, Class 1 circuits were grouped with Class 2 and 3 power-limited circuits. But now, they've earned their standalone space. Why? The reasoning is clear: Class 1 circuits operate under different voltage and volt-amp limitations than Class 2 and 3. 

Here’s a nugget directly from Section 724.40: 

“Class 1 circuits shall be supplied from a source with a rated output of not more than 30 volts and 1000 volt-amperes.” 

Remember, Class 2 and 3 have distinct voltage limitations, with the circuits tethered to either 100 or 250 volt-amps. And, all mentions of Class 1 circuits? They’ve been whisked away from Article 725. 

Requirements for Class 1 power-limited circuits as well
as Class 1 power-limited remote control and signal
circuits are now found in Article 724.

2023 NEC - What's Changed? 

2020 NEC 

Take a moment to reminisce about the 2020 NEC. It categorically stated: 

Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits. 

In this version, Class 1, 2, and 3 were all housed under one roof, inclusive of non-power-limited circuits. 

2023 NEC 

In the 2023 NEC, the requirements are divided into two articles. Article 724 is brand new and all references to non-power-limited circuits removed. Class 2 and 3 circuits are still in Article 725. 

The article titles explain it clearly: 

• Article 724 Class 1 Power-Limited Circuits and Class 1 Power-Limited Remote-Control and Signaling Circuits 
• Article 725 Class 2 and Class 3 Power-Limited Circuits 

You can review the entire Article 724 in the 2023 NEC.

Applying the 2023 Code 

Practically speaking, while the core requirements for Classes 1, 2, and 3 have stayed consistent, the game-changer is how they are organized. Class 1 circuits have been elevated to their separate space in Article 724. The load side of a Class 1 power source now dances to the tunes of general Chapters 1 through 4 of the NEC, stepping away from Chapter 7 since there are no particular conditions to address on the load side. Meanwhile, Class 2 and 3 circuits have settled comfortably into Article 725. 

Wrap Up:  

This split doesn't just offer clarity—it's about efficiency. By offering these circuits their respective articles, the NEC ensures that electrical professionals can access the information they need swiftly, ensuring installations are always up to code. Changes like these, which prioritize clarity and accessibility, reaffirm the NEC's commitment to keeping electrical professionals informed and updated. 

Sample Video Script

[Opening shot of a modern city skyline at sunrise, showing solar panels and wind turbines among tall buildings.] 

Scott: "Our cities are constantly evolving. And with it, the systems that power them. As we step into a new era of energy innovation, the National Electrical Code, or NEC, ensures we're not just keeping pace, but setting the standard." 

[Transition to a close-up of an Energy Storage System (ESS) with lights blinking and wires connected.] 

Scott: "The heart of this evolution? Energy Storage Systems. Complex, powerful, and integral to our urban tapestry." 

[Cut to a split-screen comparing the 2020 NEC title with the revised 2023 NEC title on Energy Storage Systems.] 

Scott: "The 2023 edition of the NEC has seen pivotal changes. And today, we dive deep into these nuances." 

[Display animated graphics showing a transition from 2020 NEC to 2023 NEC.] 

Scott: "Back in 2020, our understanding of energy storage was still maturing. But by 2023? We've refined and enhanced our knowledge, and the NEC reflects this growth." 

[Show a series of shots: ESS being installed, a technician inspecting the system, and an animated graphic displaying the commissioning process.] 

Scott: "One key change? The way we start up and maintain these systems. Commissioning is now front and center, ensuring that each ESS is primed for optimal performance." 

[Cut to an animation detailing the maintenance process, showing records being kept and technicians performing checks.] 

Scott: "Maintenance isn't just an afterthought—it's a commitment. For every ESS, a meticulous record ensures they run smoothly, safely, and efficiently." 

[Show a split screen of a residential house on one side and a commercial building on the other.] 

Scott: "But remember, not all ESS are made equal. While the family homes might have smaller setups often linked to solar panels, our commercial and industrial spaces require a more comprehensive approach." 

[Zoom in on a technician holding the NEC book, discussing with a colleague.] 

Scott: "For our electrical professionals out there, these changes are not just guidelines. They're the blueprint for the future of energy storage." 

[Closing shot of a city transitioning from night to day, symbolizing the continuous energy flow.] 

Scott: "With every update, the NEC paves the path to a brighter, safer, and more efficient tomorrow. It's not just about staying current; it's about powering the future." 

[Fade out with text on screen: "The 2023 NEC - Energizing Tomorrow."] 

Scott (Voice Over): "Stay informed, stay connected, and let's light up the future together."