CW1308 internal/external telephone

CW1308 telephone cable is used to interconnect equipment in fixed installations. White versions are generally available with PVC (polyvinylchloride), LSF or LSZH sheathing. The black version comes in PVC only as standard.

Black sheathed CW1308 telephone are suitable for internal or above ground external use (e.g. clipped to walls) but are not designed for submersion in water, running through ducts or direct burial applications. The white sheathed cables are suitable for internal use only.

Note: low smoke zero halogen / halogen free (LSZH, LSOH, LSHF, OHLS) should not be confused with LSF (low smoke and fume), an in-depth explanation is shown on our LSZH Control Flex front page.


Construction – CW1308 telephone
solid tinned or plain copper conductors
core insulation material matches outer sheath
cores twisted into pairs with optional earth wire
PVC, LSF or LSZH outer sheath


Technical – CW1308 telephone
conductor make-up: standard cores = 1x 0.5mm diameter (0.196mm² area)
  earth (if present) = 1/1.38mm diameter (0.196mm² area)
bend radius: 8 x overall diameter fixed
maximum capacitance: 500pF/Km maximum
resistance @ 20°C: standard cores = 97.8 Ω/km maximum
  earth (if present) = 12.4 Ω/km maximum
temperature range: -20°C to +70°C operating
construction: generally to British Telecom CW1308
flame retardant: according to EN 50265-2-1, IEC 60332-1
core identification: coloured according to Western electrical, see Colour Codes page


A printable PDF specification is available here: CW1308 internal/external telephone cable.


For alternative audio transmission cables return to the Coaxial and Telephone front page.


All measurements should be considered nominal and images for illustration purposes only. Although Central Cables Ltd has made every reasonable effort to ensure its accuracy, the information contained herein is subject to error or omission and to change without notice. In no event will Central Cables Ltd be liable for any damages whatsoever, arising in connection with the information described.