Usage Guide: Each of  the ten sets of specifications included in this booklet is meant to be used on a specific type and size structure.  the three factors for selecting a specification are: 1) frame type i.e., electrically continuous steel frame versus non-conductive concrete/masonry, or wood frame;  2) building height i.e. Class I (under 75 feet above grade) or Class II (over 75 feet above grade); and 3) choice of system material type, i.e. aluminum or copper components.