Southwire's Romex SIMpull Type NM-B (nonmetallic-sheathed cable) may be used for both exposedand concealed work in normally dry locations at temperatures not to exceed 90 °C (with ampacity limitedto that for 60 °C conductors) as specified in the 2011 National Electrical Code. NM-B cable is primarilyused in residential wiring as branch circuits for outlets, switches, and other loads. NM-B cable may berun in air voids of masonry block or tile walls where such walls are not wet or damp locations. Voltagerating for NM-B cable is 600 volts.