We'll cover three common methods: screw-mounted P-clamps, rivet-mounted clamps, and adhesive-backed clips. This method uses the classic P-style clamp (a metal or plastic clamp shaped like the letter “P” when closed). tect wires and their passage openings. By insulating these openings, bushings protect the wires from damage, for example, as c used by pulling, tugging or abrasions. There are many dife ent types, with their own. In this guide, we'll break down everything you need to know about cable clamps what they are, where to use them, how to install them, and all the frequently asked questions we get from customers and pros in the field. more Audio tracks for some languages were automatically generated. Learn. A junction box clamp, often called a cable connector or strain relief fitting, is a specialized hardware component designed to secure an electrical cable where it enters a junction box or other electrical enclosure. (Certain plastic boxes just have holes.