The Alpha Communications® model 12WJ is a special intercom cable consisting of two (2) twisted pairs and 8 single #22AWG solid copper conductors, non-shielded, with an overall PVC jacket. It can be used on a variety of different intercom and signaling systems. It is our mostpopular cable for apartment intercom type use. All twelve (12) wires are different colors, to make installation and testing easy. The cable shown is designed to meet the latest requirements for 'CM' type cable. Other types and style, such as 'plenum' cable are available on a special-order basis. Contact our sales department for more information on other wire and cable types.