Profile: Never-Fail Loop Systems, Inc. specializes in providing inductive loops and loop detectors. Our hot asphalt overlay inductive loops are designed for installation into hot asphalt or under asphalt overlay. It is wire sealed in rubber asphalt filled polypropylene conduit. The LD100 is a series of single channel inductive loop detectors. The use of microprocessor based technology enables a large number of functions to be incorporated into a small package. It is used in the parking and access control environments as safety loops, arming loops and entry or exit loops.