Southwire 12/3NM-WGX100 Romex SIMpull NM-B Sheathed Cable, Yellow, 12 AWG, 100'Southwires Romex SIMpull Type NM B (non metallic sheathed cable) may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90C (with ampacity limited to that for 60C conductors) as specified in the National Electrical Code1 NM B 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