Below is a list of Shielded Cable manufacturers from Ayer, Massachusetts. EMI shielding is common in many commercial and industrial environments, protecting a variety of electrically fueled products from electromagnetic interference that can be very harmful. One such form of EMI shielding is shielded cable, which is specifically designed to protect the cables and wires that connect electronic devices to electrical outlets. Because cables and wires conduct the electrical current that can clash with other magnetic fields in a room, it is particularly important to protect these cords properly.