Updated: December 28th, 2019

Electrical noise can seriously disrupt the proper operation of equipment. Insulation protects a cable mechanically from scrapes, abrasion, moisture, and spills, but offers no protection against EMI. Here, AlphaWire offers a primer on choosing the best shielded cable for the job at hand.

 

Shielded cablesIndustrial applications are typically electrically noisy environments. Electrical noise, either radiated or conducted as electromagnetic interference (EMI), can seriously disrupt the proper operation of other equipment. Insulation protects a cable mechanically from scrapes, abrasion, moisture, and spills, but insulation is transparent to electromagnetic energy and offers no protection. Shielding is needed to combat the effects of EMI.

Cables can transfer EMI, both as a source and receiver. As a source, the cable can either conduct noise to other equipment or act as an antenna radiating noise. As a receiver, the cable can pick up EMI radiated from other sources. A s