IEEE Standards IEEE 693-2005 pdf free download – IEEE Recommended Practice for Seismic Design of Substations IEEE 693-2005 pdf free download - IEEE Recommended Practice for Seismic Design of Substations. 1.5.1 Acceptance of previous versions of IEEE Std 693 Equipment qualified to IEEE Std 693-1997 or later versions will be deemed to be... 02-21 Download Now