Selection Chart

Combine Proper Combination of I, II, and III in Same Horizontal Row to Determine Applicable Specification.
 
I. Frame Type II. Bldg. Height III. Material Req'd IV. Use Spec Set
Conductive (continuous steel frame) versus non-conductive (wood or masonry frame) All or part of structure 75' or more above finished grade versus below 75' Copper or aluminum lightning protection system components Select proper spec. from this column based on Col. I, II, and III
Sets 1-2

These sets are for concrete/masonry or wood frame structures less than 75' tall. The final choice of specification in this group is based on material type. Set 1 uses copper equipment for the entire system. Set 2 makes an aluminum roof system mandatory where this situation is desired or necessary due to roof construction. Copper is still retained for the downlead grounding portions of the system.
I. Frame Type II. Bldg. Height III. Material Req'd IV. Use Spec Set
Non-Conductive Below Copper Only Use Set 1
Non-Conductive Below Aluminum on Roof w/Copper Ground Use Set 2