Acceptance Testing & Functional Commissioning

Ensuring Your New Electrical Equipment & Systems Are Ready for Decades of Safe, Reliable Service

Acceptance testing and functional commissioning is the systematic process to ensure that tested electrical power equipment and systems are operational, within applicable standards and manufacturers’ tolerances, installed according to design specifications, and follow the design intent and owner’s operational requirements when functioning.

As a NETA Accredited Company, CBS Field Services uses the ANSI/NETA 2021 ATS Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems as a guide to ensure accurate, unbiased testing and reporting to protect the owner’s interest — often by working in conjunction with the equipment manufacturer and/or electrical contractor.

CBS Field Services provides acceptance testing for new electrical power equipment and systems at new and existing facilities. Our field tests and inspections ensure that your electrical apparatus and systems perform satisfactorily, minimizing downtime and maximizing life expectancy and safety.

Acceptance testing and commissioning services are often required on construction projects where the highest degree of reliability is necessary due to the critical nature of the facility. If your electrical construction project requires field quality control, CBS Field Services is available as a resource. See what types of electrical equipment require acceptance testing.

While some may question the cost-benefit of comprehensive acceptance testing, the cost is minimal when compared to that of damaged equipment or production and facility losses if something goes wrong after the equipment is placed in service. Acceptance testing by CBS Field Services ensures that all stakeholders have done their part to deliver a product that will perform safely and reliably for many years to come. This includes the following:

  • The engineering firm that designed the equipment system
  • The manufacturer(s) of the electric equipment components
  • The electrical contractor who installed the equipment

CBS Field Services regularly finds circuit breakers or other electrical equipment that fails to perform properly — and it happens more than you might expect. Common errors include the following:

  • Improper circuit breaker and relay settings
  • Incomplete or unavailable documentation and coordination studies
  • Critical system interconnection wiring issues that result when a variety of suppliers provide components and therefore no single company is responsible for the entire system

Without the acceptance and functional testing services of a NETA-accredited company utilizing experienced and certified technicians, comprehensive verification is left to chance. Taking a chance is no way to start up an electrical system you will depend on for decades to come.

Whether you’re the system owner, an OEM, and electrical contractor, or a general contractor, please contact us to discuss your requirements, request a quotation, or receive additional information.

Testing circuit breakers to ensure proper operation
ANSI/NETA 2021 ATS Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems
Electrical maintenance and testing of circuit breaker

Benefits of OEMs and CBS Field Services Working Together

A strong partnership between OEMs and a third-party electrical field service test provider means parts of your system are checked more than once, often by different personnel. It offers several other benefits as well:
  • Manufacturers bring in-depth knowledge of today’s increasingly complicated switchgear designs
  • Manufacturers address equipment issues and provide updated drawings as part of their final package
  • Third-party testing organizations frequently test items that are usually not tested by the manufacturer, such as:

  • High-current testing of protective devices and ground-fault systems
  • Components
  • Ground systems
  • Medium – and low-voltage cable systems
  • Current transformers

  • Potential transformers
  • Bus duct

  • Metering systems
Acceptance testing and commissioning of electrical power systems

Optional acceptance testing available from CBS Field Services includes:

  • MAC testing of vacuum interrupters in vacuum circuit breakers
  • Power factor testing of transformers
  • Thermographic surveys

What types of equipment require acceptance testing?

  • Switchgear and switchboard assemblies

  • Transformers: dry type and liquid filled
  • Cables: low- and medium-voltage

  • Circuit breakers: low-, medium-, and high-voltage
  • Protective relays: electromechanical, solid state, and microprocessor
  • Instrument transformers (current and potential transformers)
  • Metering devices
  • Regulating apparatus
  • Grounding systems

  • Rotating machinery
  • Motor control centers
  • Battery systems

Contact CBS Field Services

Whether you’re an owner, OEM, or contractor, please don’t hesitate to contact us to discuss your requirements, request a quotation, or receive additional information.

Arc Flash Study & Other Power Engineering Services

Our professional engineers will give you confidence in the safety and reliability of your facility with an arc flash study and other power engineering services.

Electrical Acceptance Testing & Commissioning

Lifelong reliable power system service starts with a comprehensive critical acceptance testing plan. We ensure accurate, unbiased testing and reporting.

Electrical Testing & Preventive Maintenance

Schedule electrical testing & maintenance services from CBS Field Services – such as power monitoring, circuit breaker timing, and others – to ensure your power system is reliable and safe.

Thermographic Survey – Infrared Scan Services

Our infrared survey produces thermal images of your electrical power equipment to detect common potential points of failure that can cause power outages.


Keep up with the latest information from CBS Field Services and developments from across the electrical industry.


The Group CBS family of electrical field service, service shop, and power products companies offer everything you need for manufacturing, testing, parts, repairs, and engineering services.

Manufacturing Services

Group CBS affiliates offer in-house manufacturing of obsolete replacement components for all types of electrical power circuit breakers and switchgear.

Replacement Parts

The service shops of Circuit Breaker Sales, a Group CBS affiliate, have tens-of-thousands of renewal and replacement parts for your power distribution equipment, including vintage relays and controllers.

Power Products

CBS Power Products is the electrical industry’s leader for remote racking and switching solutions and for vacuum interrupter replacements and test sets.

Repair, Life Extension

Extend the life of your obsolete switchgear, motor controls, and circuit breakers with our retrofit, retrofill, and upgrade life-extension programs.

CBS Field Services is a NETA Accredited Company

NETA Accreditation Ensures High-Quality

As a NETA Accredited Company since 2011, CBS Field Services has numerous NETA certified technicians on staff.  We underwent a rigorous application process to ensure that we provide electrical testing and maintenance services to the highest standards of safety and reliability,


Do you need help with electrical testing, maintenance, an arc flash study or other power engineering service? Give us a call or send us a note.

After Hours or Emergency Support Available 24/7  888.395.2021

After Hours or Emergency Support Available 24/7 888.395.2021