General Type AC cables are constructed in accordance with the National Electrical Code? (NEC?) and complies with the safety requirements of UL 4@ Standard for Safety for Armored Cable. These cables employ copper@ copper-clad@ or acceptable aluminum alloy conductors. Copper conductors are of sizes 14?C1 AWG. Aluminum or copper-clad aluminum conductors are of sizes 12?C1 AWG. All conductors 6?C1 AWG are stranded. The NEC? recognizes three AC cable types??Types ACHH@ ACTH@ and ACTHH. Type ACTHH is the most common of these. National Electrical Code? and NEC? are registered trademarks of the National Fire Protection Association@ Inc.@ Quincy@ MA 02269.