The C-Bus cable features eight single core conductors (four Unshielded Twisted Pairs or UTP), encased in a pink outer sheathing that is rated to 240V AC. Pink has been chosen in order to distinguish between the C-Bus cabling in an installation. A second feature is that the cable may for short runs be routed into a switchboard close to mains cable.

The outer sheath insulation resistance is suitable for this application. The following illustration shows the recommended technique for cable termination giving optimum performance, and immunity from electromagnetic interference (EMI).

Note: The mutual twist of solid and dotted conductors of opposing coloured conductors. This ensures a good electrical termination, with favorable common mode noise characteristics.