Witness and verify critical fabrication, inspection, and test activities at hold/witness points, including incoming material verification, dimensional/fit checks, wiring and termination quality, insulation resistance/continuity familiarity, point-to-point checks, functional/loop checks, protection/relay testing, FAT sequences, and other specified tests. Review and validate vendor documentation packages, including ITPs, material certifications, nameplate/datasheet compliance, wiring diagrams, schematics, panel layouts, inspection/test records, calibration certificates, FAT procedures and results, and equipment data books/O&Ms; hold release when documentation is incomplete or nonconforming.