If you're an electrician, contractor, or DIY enthusiast working with Romex® NM-B cable, there's a major update you need to be aware of. In 2024, leading wire manufacturers rolled out new color-coded jackets for 3-conductor NM-B cables to make jobsite identification quicker and more accurate.
Here’s a breakdown of what each new color means—and how it helps you wire smarter.
What Are the New Romex Colors for 2024?
Until recently, Romex wire was color-coded mostly by gauge and ampacity, with:
- Shop White for 14/2 (15A)
- Shop Yellow for 12/2 (20A)
- Orange for 10/2 (30A)
The problem? There was no quick visual distinction between 2-conductor and 3-conductor cables. That’s now changed.
| Wire Type | New Color (2024) | Traditional Use |
|---|---|---|
| Shop 14/3 NM-B | Blue | 15A circuits with an additional traveler (3-way switches, split receptacles) |
| Shop 12/3 NM-B | Purple | 20A circuits with multiple hots (multi-way lighting, small appliances) |
| 10/3 NM-B | Pink | 30A circuits (electric dryers, HVAC units) requiring three conductors |
Why Did the Color Change?
The new color scheme is all about faster identification and fewer errors.
- Improved safety: Reduces accidental mix-ups between 2- and 3-conductor wires.
- Jobsite efficiency: Quickly identify wire type at a glance—no need to read fine print on the jacket.
- Better organization: Great for apprentices and pros alike when sorting material.
Is This NEC Code?
While not mandated by the NEC, the new color codes are being widely adopted by manufacturers like Southwire and Cerrowire. It’s quickly becoming a new industry standard, so staying informed will keep you ahead of the curve on jobs, inspections, and installations.
Where Are the New Romex Colors Used?
The updated cables are ideal for:
- Residential and commercial lighting control
- Multi-way switches (3-way or 4-way)
- Dedicated circuits with neutral and multiple hots
- Projects requiring clearer labeling for inspection or large crews
Final Thoughts
As of 2024, if you see blue, purple, or pink Romex on the shelf—don’t be alarmed. These colors are engineered to make your work more accurate and efficient. And here at Sonic Electric, we’re already stocked and ready to support your next install.
Need Romex?
We stock all the new Romex colors, plus the tools and accessories to get the job done right.
👉 Shop Romex® NM-B Wire or contact us today for bulk pricing.
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