MC Cable vs UFB Underground Cable
Romex NMB is the type of electrical wire that is used indoors to run 2 or 3 THHN wires through your home at once.
Type NM-B (nonmetallic-sheathed cable) may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90°C.
Romex cable is primarily used in residential wiring as branch circuits for outlets, switches, and other loads. NM-B cable may be run in air voids of masonry block or tile walls where such walls are not wet or damp locations. Voltage rating for NM-B cable is 600 volts.
Type NM-B cable meets or exceeds UL Standard 83, UL Standard 719, Federal Specification A-A-59544, and requirements of the National Electrical Code.
Designed for easier pulling, resulting in easier installation. The cable jacket is color-coded for quick size identification; White - 14 AWG, Yellow - 12 AWG, Orange - 10 AWG, and Black - 8 AWG and 6 AWG.
Romex electrical cable is made with THHN wires and a bare copper ground wire. It has do not recommend even trying to use Romex in conduit because there is moisture and the Romex jacket cannot withstand it.
If you need a cable to go in conduit I recommend UFB cable which even stands for Underground feeder. Our underground cable can be used in conduit or for direct burial in the earth. UFB is a very popular type of electrical cable because it isn't that much more expensive than Romex and it can be used or stored anywhere.
Romex wire comes in 250' coils or 1000' spools from the manufacturer but we can cut the cable to length for you as a value added service. We cut all of our electrical wire to length for our customers because it cuts costs for each job by eliminating waste. We sell the Romex cables in as small as 50' lengths and offer free shipping on orders over $250.00!
Romex NMB is color coded by awg size so the electrical contractors can easily identify the size of the cable. Romex 14/2 and 14/3 are both white, Romex 12/2 and 12/3 are both yellow, the Romex 10/2 and 10/3 are both orange and the Romex 6/3 and 6/2 have the black jacket.
All of the UFB underground cables have a gray jacket because it's harder to make the tough rubber jacket in colors. UFB needs the though jacket to protect itself against the outdoor weather.
If you're looking for a different type of electrical wire just email us or give us a call so one of our sales people can find the correct cable for your application.