The cable contains a pair of twisted signal wires and a cable shield. Standard delivery is 10 m (33 ft) of cable. The maximum length of an interconnecting cable is 200 m (660 ft). The signal wires are interchangeable (non-polarized). The cable shield is connected to the protective earth at the indicating transmitter.
If you have a junction box, you can use your own cable, as long as it meets IEC 61158-2 type A standard requirements. For more information, see Interconnecting cable specifications.