The following range of multipair internal telephone cables are manufactured in accordance with
BT type CW 1308. They are constructed from a 0.5mm tinned copper conductor, which is
PVC insulated, these cores are twisted into pairs and the required number of pairs are then laid
up in either layers for cables containing up to and including 25 pairs, or in units for items of 32
pairs and above. The pairs are colour coded for ease of identification. An earth conductor of
1.38mm PVC insulated plain copper is included where shown. The cables are either black or
white PVC. For colour code details please refer to table below. Foil shielded versions are
available in certain pair sizes.