Prepare and update detailed electrical drawings for EHV AIS/GIS substations up to 400 kV/765 kV, including layouts, SLDs, protection and control schematics, cable routing, earthing, and lightning protection drawings. Interpret engineering inputs, equipment layouts, specifications, and markups; incorporate revisions and field changes; produce as-built documentation; prepare preliminary designs and BoMs for bids; and coordinate with engineering, construction, consultants, EPCs, vendors, and site teams.