Infrared electrical inspection and IR scanning of electrical equipment

• High resistance connections at lugs, terminals, splices and bus joints, often associated with looseness, corrosion or damaged contact surfaces.
• Overloaded conductors and components running hotter than comparable equipment under similar conditions.
• Phase temperature differences that warrant investigation for load imbalance or connection problems.
• Abnormal heating at breaker poles, fuse clips, contactors and disconnect contacts.
• Localized heating at transformer connections, busway joints and battery interconnects.

What an IR scan cannot establish

Heat patterns indicate where investigation belongs, but do not establish the root cause alone. A hot connection needs electrical assessment before repair. Infrared does not see through metal covers, detect every internal insulation defect or reveal faults that produce no measurable heat during the visit. Shiny copper can reflect nearby heat and distort apparent temperatures.

For bearings, roofs or envelope problems, request infrared inspection of mechanical and building systems. Combining scopes can make sense, but electrical reporting and access need separate agreement.

NFPA 70B became a standard in 2023, replacing its earlier recommended practice status. Its thermography requirements call for inspection of electrical equipment at intervals no longer than 12 months, with Equipment Physical Condition 3 requiring inspection every 6 months. Those intervals belong in the electrical maintenance program, alongside documented equipment condition and corrective work.

NFPA 70B thermography requirements also address operating conditions. Scan at normal operating load. Where normal load is not possible, arrange loading at no less than about 40 percent of nominal load and record the actual conditions. Lightly loaded equipment can hide defects that become apparent during production.

Document results, equipment coverage, load and limitations. Confirm the details against the edition your authority having jurisdiction (AHJ), insurer or maintenance program cites. Publication as a standard does not make every provision an automatic legal obligation at every site. Ask the provider to identify gaps before presenting the report as evidence of the specified survey.

NFPA 70E addresses the PPE, risk assessment and energized work side. Many contractors use NETA MTS or ANSI/NETA ATS temperature rise severity tables to classify findings. Have the report name the applicable document, edition and comparison basis. A severity label without its criterion is hard to defend.

Property insurers commonly request annual IR reports for commercial buildings and plants. Some offer premium credits for an accepted inspection and documented repairs, but neither a report requirement nor a credit is universal. The policy, underwriting instructions and loss prevention recommendations control what your insurer expects.

Obtain those instructions before seeking infrared electrical inspection services. Confirm equipment coverage, acceptable thermographer credentials, the renewal deadline and whether the insurer needs repair closure evidence. An unresolved critical finding may matter more than the report date. Request written acceptance criteria rather than assuming any thermal camera report will satisfy underwriting.

Use an equipment register to define the route and quote. Specify inaccessible compartments before the visit.

Outdoor work needs weather and reflection notes. The power and wind industry scope helps frame requests involving generation assets or substations alongside building distribution.

• Equipment IDs and locations for everything surveyed, with a separate list of skipped assets and the reason each was omitted.
• Paired infrared images and visible photographs for findings, with enough context to locate the component.
• Measured temperature, reference temperature and delta T, identifying whether the comparison uses ambient or a similar loaded component.
• Severity class, the classification criterion and a recommended action with repair priority.
• Operating load, how it was established, scan conditions and limitations affecting interpretation.
• Survey date, thermographer name and certification level, camera identification and relevant measurement settings.
• Repair tracking and follow up scan results when included in the order.

Ask for a report sample before awarding the job. The maintenance team should be able to turn each finding into a work order without guessing which enclosure or terminal was inspected.

• Share the asset register, previous report and insurer instructions. The contractor agrees on coverage, load windows and deliverables.
• Assign qualified electrical workers to manage access and remove or replace covers under the site's electrical safety program. The thermographer does this only if separately qualified and authorized for that task.
• Schedule the survey during representative operation. Record loads and identify equipment that needs a return visit.
• Scan accessible components, compare relevant temperatures and capture thermal and visible images. Urgent findings go to the designated facility contact during the visit.
• Review the report, assign corrective work and arrange verification scans after repairs where needed.

Infrared windows can permit inspection with covers closed if their placement, spectral transmission and field of view suit the target. They do not reveal every compartment. Agree on window coverage and measurement correction in advance. Ordinary glass and solid panel covers do not provide the same access.

Typical US planning ranges are roughly $400 to $900 for a half day and $900 to $2,200 for a full day. These are planning ranges, not quotes. Equipment count, access, travel, shift timing, electrician support and report detail affect the offer. Large or complex sites may require several visits.

Use the thermal imaging inspection cost guide for pricing models and the detailed price table. Ask bidders whether mobilization, cover removal, reporting and repair verification are included. A lower day rate offers little saving if inaccessible equipment leaves the survey incomplete.

Ask for the thermographer's Level I, II or III credentials, the issuing body, current status and the role each person will perform. ASNT based employer certification and ITC credentials use defined training and qualification pathways, but a course certificate alone does not establish every capability. Level I commonly supports data collection, Level II interpretation and reporting, and Level III procedure development or technical oversight, subject to the certification scheme.

Review an electrical report sample, liability insurance and NFPA 70E training for the assigned personnel. Thermography certification alone does not qualify someone to open energized gear. Ask how the contractor handles reflections, uncertain loads and inaccessible connections. The NDT companies guide supports comparing providers by documented scope and qualifications.