Symmetrical cable with single-wire copper conductors, foam polyethylene insulation with a thin outer layer of solid polyethylene, with a common screen on the core in the form of a polyester tape covered with aluminum and a second screen in the form of a braid made of copper strands, with a PVC sheath. The cables are designed to connect L2-BUS components (standard 485) and transmit analog and digital signals. The pair construction ensures good symmetry with respect to the ground, and the double screen protects against interference from external electromagnetic fields, which in turn gives a very good transmission quality. The cables can be used in dry and damp rooms, intended for permanent installation.