Southwire Romex Brand SIMpull Type NM-B (nonmetallic-sheathed) cable for residential branch circuits. Stranded copper conductors insulated with PVC and a nylon sheath, inside a PVC jacket built with Southwire SIMpull Technology. Rated 600 volts; conductor insulation is rated 90 deg C per UL 719, with ampacity limited to the 60 deg C column of the National Electrical Code.

• 2 conductors of 8 AWG stranded copper (black and white) plus a bare 10 AWG ground with kraft paper wrap
• Put up as a 125 ft coil
• Conductor: bare copper per ASTM B3, Class B compressed stranded per ASTM B8 (7 strands)
• Insulation 30 mils, PVC jacket 30 mils, approximate overall diameter 0.628"
• Approximate weight 190 lb per 1000 ft
• For exposed and concealed work in dry locations; may be run in air voids of masonry block or tile walls where those walls are not wet or damp locations
• The 60 deg C ampacity limit puts 8 AWG NM-B at 40 A under the NEC
• UL 719, ASTM B3, RoHS-2 - manufacturer part 28893602

Tip: Typical use is 40 A two-wire 240 V loads such as condensing units and air handlers. Keep the inner bend radius at a minimum of 5x the cable diameter (about 3.1" here) so the jacket and insulation are not damaged. The individual conductors inside NM-B are not listed or marked as THHN and may not be installed apart from the complete cable.