TX3-CX-2 (as well as 4,6, & 8) – are all UL Listed Our two-door Access Controller is now UL listed. In addition, it is UL listed in 4, 6 and 8 door configurations using the TX3-BBCX-4W enclosure. These now join our TX3-CX1 to form a complete line of UL listed Access Control solutions.