Which file should I choose?
Allen-Bradley-IEC-NFPA-1756-CMS1B1-DWG-ZIP-2D-CAD-Block.zip is the original NHP Electrical Engineering Products archive. Its 6 drawing/model members include IEC_1756-CMS1B1_ML.dwg, IEC_1756-CMS1B1_OV.dwg, IEC_1756-CMS1B1_SL.dwg; the complete filenames are in the file inventory. Match the member to IEC NFPA 1756 CMS1B1 before placing it.
