What are the key activities in comprehensive electrical system commissioning?

Electrical commissioning includes: pre-functional testing (megger insulation tests, continuity verification, CT/PT polarity), functional testing (breaker operation, protective relay settings verification, transfer switch timing), integrated system testing (generator starting and load transfer, UPS battery discharge, lighting control sequences), performance verification (voltage regulation, power quality measurements, ground resistance), and documentation (test reports, as-built drawings, O&M manuals). Issues found during Cx must be resolved before acceptance. Owner training ensures proper operation and maintenance. Trend data establishes baseline for performance monitoring.