BT coaxial (British Telecom coax)

BT coaxial (coax) cable is made to British Telecom standards and is designed for use in a range of signal transmission applications. BT2002 & BT2003 types are primarily used for digital telephone & data links.

Coax cable is called “coaxial” because it includes one physical channel (inner conductor) that carries the signal surrounded by another concentric physical channel (braid screen), both running along the same axis. The two channels are separated by a precisely measured tubular insulating layer (dielectric) to achieve constant conductor spacing.

Black PVC sheathed BT coaxial cables are suitable for internal or external use whereas the white PVC version is for internal use only. RBS cables are suitable for direct burial applications & LSZH cables provide increased safety in the case of fire.

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.


References & Sizes
BT2001 BT2002  BT2003 BT3002  BT5000
 7/0.2mm  7/0.2mm  1/0.61mm  1/0.31mm  1/0.96mm
Single Core Single Core Single Core 1, 8, 16 Core Single Core


Construction – BT coaxial
solid or stranded plain copper conductors
solid, foamed or cellular PE (polyethylene) core insulation (dielectric)
tinned or plain copper wire braid screen/s
PVC (polyvinylchloride),  RBS (raydex bonded style) or LSZH (low smoke zero halogen) sheath


Technical – BT coaxial
impedance: 75 Ohms (+/- 3 Ω)
temperature range: dependent on type, please check if critical


A printable PDF specification is available here: BT coaxial (British Telecom coax) cable.


For more coaxial 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.