Service

Medium-Voltage Cable System Field Testing Services

Find out more about our medium‑voltage cable testing for commissioning and diagnostics, aligned to IEEE and IEC standards, along with related UL services.  

A close up of a rural linemen workers hands using copper wire while installing a electrical transformer being fed from a ditch which is being refilled by a backhoe operator in Western Colorado

Medium‑voltage cable testing you can trust

Medium‑voltage cables support efficient and reliable power distribution across industrial, commercial and residential sites, typically in the 1 kV to 69 kV range. Our field testing helps you evaluate safety, quality and performance so you can build a solid basis for MV circuit maintenance and asset planning.  

How our MV cable testing works 
UL Solutions performs objective, science‑based electrical cable testing in the field, leveraging decades of specialized expertise in wire and cable performance and safety. We tailor methods to cable design and site conditions, then deliver results that support reliability decisions.

Commissioning and diagnostic options

Commissioning tests for new or repaired circuits 
Commissioning assesses whether new installations or repairs were completed correctly and without inherent defects before energization. Our team selects the appropriate withstand and condition checks for the circuit and documents results for your records.  

Diagnostic tests for in‑service assets 
Diagnostic testing helps to determine the condition of MV cables already in service. Findings help you identify aging or installation issues early, schedule targeted maintenance and mitigate the risk of unplanned outages in commercial and utility environments.  

Test technologies and MV cable testing standards

Electrical tests we perform 
Depending on your objectives, we can apply AC withstand, very low frequency (VLF) withstand, damped AC (DAC) withstand, partial discharge testing, dielectric response and tan δ, time‑domain reflectometry (TDR), frequency-domain reflectometry (FDR), neutral corrosion checks, conductor resistivity, insulation resistance and thermal infrared imaging.  

Standards we work to 
Our MV cable testing services align with leading cable testing standards and guides, including IEC 60502, the IEEE 400 series, IEC 63026 and IEEE 1617, among others. We perform safety and compliance testing to requirements from AEIC, ICEA, IEC, IEEE and NETA. Customers use this clarity to meet internal specifications for MV cable testing standards.  

Benefits for utilities, EPCs and facility owners

Actionable results for reliability and risk reduction 
You receive clear findings that help you prioritize maintenance, plan replacements and manage risk on medium‑voltage wire and cable systems. This supports performance objectives for utilities, EPCs and commercial facilities seeking dependable cable testing services and commercial cable diagnostic support.  

Why choose UL Solutions 
We are a global safety science leader known for impartial assessments and scientific rigor. Our teams bring decades of MV cable systems experience, actively participate in standards setting committees, and deliver practical insights for asset managers and engineers.

Frequently asked questions

Commissioning confirms that new or repaired MV cable installations are free of inherent defects before energization, while diagnostic testing evaluates in‑service cables to identify aging or installation issues that could affect reliability. 

Depending on your objectives, we can apply AC, VLF and DAC withstand testing, partial discharge, dielectric response and tan δ, TDR, FDR, neutral corrosion checks and more, aligned to standards such as IEC 60502, IEEE 400 series, IEC 63026 and IEEE 1617.

Field testing strategies consider accessories that influence system integrity, and our broader program coverage addresses installation quality and defect detection to support reliable operation. For projects with HV sections, our HV page details accessory focus areas as well. 

Laboratory services provide certification and performance verification, including UL 1072 listing for MV cables, type and pre‑qualification testing and witnessed testing via our Data Acceptance Programs to support product compliance needs.

Yes. UL field evaluations help authorities determine compliance of installed products. The program is ISO/IEC 17020 accredited and can apply an evaluated label immediately when requirements are met. 

You can combine MV field testing with our high‑voltage field testing program to align methods and reporting across the full cable scope from commissioning through condition assessment.  

Supplier audits, product inspections and witnessed testing provide assurance that cable lots meet specifications and application requirements, reducing risk and improving procurement outcomes for utilities and EPCs.  

Get connected with our team

Thanks for your interest in our products and services. Let's collect some information so we can connect you with the right person.
Thank you!

One of our team members will respond to your request as soon as possible.

Related services

Electrical new high voltage cables been installed in underground Trenches.

Medium- and High-Voltage Cable Systems Testing

UL Solutions provides testing, inspection and certification (TIC) services for medium- and high-voltage cable systems, helping companies determine compliance with regulatory requirements.
research plant in the industry: machine for the production of artificial flashes - experimental plant in mechanical engineering

Laboratory testing and certification

If you need certification or laboratory ‑based performance verification to standards such as UL 1072, the Standard for Medium-Voltage Power Cables or witnessed testing via our Data Acceptance Programs, visit our laboratory services page to plan the next steps after field diagnostics.

Worker inspecting high voltage cables.

High Voltage Cable Field Testing Program (HVCFTP)

Expert-led services to help increase confidence in the quality, reliability and performance of inland and offshore high voltage cables.

Many-multicolored-intersecting-and-overlapping-pipes-birds-eye-view

Field evaluations for installed equipment

For equipment that lacks certification or has been modified on site, a UL field evaluation can help satisfy code authorities and support acceptance, with ISO/IEC 17020 accreditation and rapid labeling when requirements are met.

A picture of power distribution equipment inside a power plant.

Medium Voltage Distribution Equipment Testing and Certification

When your scope includes switchgear, junction boxes or substations, our testing and certification services help align installations with NEC and NFPA requirements and address global market access needs.

Sprawling modern city

Supply chain inspections and audits

Strengthen procurement outcomes with supplier audits, product inspections and witnessed testing tailored to MV cable requirements for utilities and EPCs.