For general wiring of homes; stores; and shops. Southwire Romex Brand SIMpull NM-B (non-metallic sheathed) cable may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90¬?C (with ampacity limited to that for 60¬?C conductors) as specified in the 2011 National Electrical Code. 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 such walls are not wet or damp locations. Voltage rating for NM-B cable is 600 volts.