In signal and data applications (Ethernet, RS-485, coaxial, instrumentation), the selection criteria shift from power to . Here, electrical noise is the enemy. Cables operating near variable frequency drives (VFDs), motors, or radio transmitters must feature proper shielding (braid, foil, or combination) to reject electromagnetic interference (EMI). Additionally, the characteristic impedance of the cable (e.g., 50Ω, 75Ω, 100Ω) must match the source and load to prevent signal reflections, which corrupt data. For long runs, the attenuation (signal loss per 100 meters) must be calculated to ensure the receiver can still distinguish the signal from noise. Using an unshielded speaker wire for a high-speed Ethernet connection will result in packet loss, retransmissions, and network crashes. In the digital world, the wrong cable can bring a factory’s communication network to a standstill.
This guide outlines the key factors to consider when selecting cables to ensure safety, efficiency, and longevity. cable selection
Data cables are sensitive to physical deformation. Exceeding the bend radius (usually 4x the cable diameter for Cat6) can untwist the pairs internally, leading to packet loss and reduced speeds. In signal and data applications (Ethernet, RS-485, coaxial,