CerroMax and Southwire: The Same Job, Two Makers
CerroMax and Southwire are both NM-B copper Romex-type cables that meet identical electrical code requirements, so they are interchangeable on a circuit when sized correctly. CerroMax is the residential NM-B line manufactured by Cerrowire, based in Alabama, and Southwire is one of the largest wire and cable manufacturers in the United States. Both are made in the USA. For a homeowner or contractor, the practical question is rarely which performs better and more often which offers the better price and stock.
What They Have in Common
Both brands produce UL-listed NM-B cable rated for the same applications in dry interior locations. Both follow NEC 334.80, which holds NM-B ampacity to the 60 degrees Celsius column, so 14/2 is rated for 15 amps, 12/2 for 20 amps, and 10/2 for 30 amps regardless of brand. Both use the industry color convention, white jacket for 14 AWG, yellow for 12 AWG, and orange for 10 AWG, which makes gauge identification fast on the job.
Where the Differences Are
Manufacturer and Origin
The clearest difference is the maker. CerroMax comes from Cerrowire in Alabama, and Southwire is a national manufacturer with a long history in building wire. Both are domestic copper cable, so buyers who prioritize US-made wire are covered either way.
Price and Availability
Copper wire pricing tracks the commodity copper market for both brands, but day-to-day pricing and stock can differ by run length and gauge. For a large job, comparing the price per roll on the exact gauge and length you need is the most useful comparison you can make.
Handling Feel
Some installers develop a preference for how one jacket pulls and strips versus another. This is a feel preference, not a performance gap, since both meet the same listing and code standards.
Which Should You Buy?
For most projects, choose whichever brand gives you the better price and availability on the specific gauge and roll length you need, since both are UL-listed NM-B copper that meet the same NEC requirements. Match the gauge to your circuit amperage first, then compare brands on cost.
IB Lighting carries both CerroMax by Cerrowire and Southwire NM-B in our electrical wire and cable collection, with free freight plus free freight insurance on every order. Call (800) 674-9019 for current pricing on the gauge and length you need.