You've personally witnessed and signed off Level 1 to Level 5 testing on mechanical plant: chillers, cooling towers, dry coolers, pumps, CRAH and CRAC units, AHUs and MAUs, computer room ventilation, heat exchangers, expansion tanks and pressurization units, water treatment, piping distribution, control valves, VFDs, leak detection, fuel oil transfer, and the BMS and HVAC control sequences that tie them together. You've done the same on the electrical side: generators and paralleling switchgear, HV, MV, and LV transformers and switchgear, main switchboards, UPS and battery systems, ATS and STS, PDUs, busways, RPPs, grounding, lighting controls, PLC-based automatic and semi-automatic switching controls, and the EPMS.