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Prior to the 1950s, heavy-duty clamped aluminum stranded conductor connections were made with grooves specially drilled for each conductor size. Performance was excellent, and a history of many years of satisfactory service supported this "precise fit" groove design. These "drilled-to-fit" grooves were the basis for AFL's research into a "universal groove" design of equal performance. A wide variety of groove shapes were tested. Many could be said to be "universal" in the sense they would accept a range of conductor sizes. However, a blended radii proved to be the shape that would accommodate a wide range of conductors and have the desired low electrical resistance for each conductor size. This patented groove shape is utilized in all of AFL's clamps and connectors.
Parelle Groove Clamps