Why Electrical Testing and Commissioning Matters
Commissioning is the last chance to find problems before equipment carries load. Wiring errors, reversed CT polarity, incorrect relay settings, damaged insulation and unimplemented arc flash study settings are all found during commissioning, or they are found later as failures, outages and injuries.
First energization also carries risks that normal operation does not. Equipment is unfamiliar, interlocks may be temporarily defeated, multiple trades work in the same area, and test equipment applies high voltages and currents. A structured commissioning process protects people, prevents startup delays and expensive rework, and gives owners documented proof that the system performs as designed.
Commissioning also produces the baseline test data that every future maintenance program depends on. NFPA 70B and CSA Z463 maintenance programs, and later NETA MTS testing, all compare against the readings taken at commissioning. A system that is poorly commissioned is harder to maintain for its entire life.
Course Overview
The course follows a commissioning project from start to finish.
Day 1 begins with a short, practical review of the testing and commissioning standards:
- what each standard covers,
- how the current editions apply,
- how to read a NETA ATS acceptance table.
It then covers commissioning planning, documentation and design verification, safety during testing and energization, test methods and test equipment, and transformer commissioning.
Day 2 covers switchgear, circuit breakers and cables, then instrument transformers and protective relays, then grounding, substation equipment and DC systems, then motors, drives and control systems. It continues with emergency power, integrated systems testing and new technologies such as battery energy storage and solar PV. It finishes with first energization, start-up and turnover.
Standards referenced:
- ANSI/NETA ATS-2025, ANSI/NETA ECS-2024 and ANSI/NETA MTS-2023
- NFPA 70E-2027 and CSA Z462:24
- NFPA 70B-2026 and CSA Z463
- NEC 2026 and CE Code 2024
- IEEE test guides for transformers, cables, grounding and protection systems
Learning Outcomes
Participants will be able to:
- Apply ANSI/NETA ATS, ANSI/NETA ECS and related standards to plan and specify the acceptance testing and commissioning of electrical power systems.
- Develop a commissioning plan with pre-functional checklists, functional test procedures, document control and deficiency tracking from construction through turnover.
- Identify the hazards of electrical testing and first energization, and apply NFPA 70E or CSA Z462 safe work practices to control them.
- Select appropriate test methods and test equipment, and interpret insulation, power factor, winding resistance, turns ratio, contact resistance and injection test results against acceptance criteria.
- Verify that protective relays, instrument transformers and circuit breaker trip units are correctly installed, set and wired, using secondary injection, primary injection and end-to-end testing.
- Commission transformers, switchgear, cables, motors, drives, control systems, emergency power and integrated systems in the correct sequence.
- Plan and carry out a safe first energization, including switching plans, phasing checks and load checks, and turn the system over with complete baseline documentation.