⚡ NFPA 70B Has Changed — Thermography Is Now Part of the Electrical Maintenance Standard
For many years, NFPA 70B was published as the Recommended Practice for Electrical Equipment Maintenance. That changed with the 2023 edition, when NFPA 70B became a standard containing mandatory “shall” language.
The current edition is:
That change is important, but it needs to be stated correctly. An NFPA standard does not automatically become law everywhere simply because NFPA publishes it. Its requirements become enforceable when the standard is adopted by an authority having jurisdiction, incorporated by reference into another enforceable requirement, or made applicable through contracts, policies, specifications, or other governing requirements.
🔥 Where Thermography Fits Into NFPA 70B
NFPA 70B establishes requirements for an electrical maintenance program and specifically incorporates infrared thermography as a recognized maintenance and condition-assessment method.
Section 7.4 addresses infrared thermography and the documentation of temperature differences (ΔT). The thermographic comparison must be based on one of the recognized comparison methods:
✔ Similar electrical components under similar loading
✔ Electrical component temperature compared with ambient air temperature
✔ Temperature differences between the area of concern and the reference area documented
✔ Circuit loading and inspection conditions documented as applicable to the inspection
NFPA 70B also permits other methods of verifying connection and termination condition in applicable situations. That means the defensible statement is not that “every piece of electrical equipment must always receive an infrared scan,” but that thermography is expressly built into the maintenance standard and must be performed in accordance with the applicable NFPA 70B requirements whenever the maintenance program or equipment task calls for it.
🎯 What NFPA 70B Does — and Does Not — Do With Severity
NFPA 70B establishes the thermography framework, including the use of ΔT, the reference comparison, operating conditions, and documentation. It does not create the Certified Thermal Electrician™ color system.
CTE™ colors are a teaching and visual-mapping aid.
The technical result must first be established using the proper comparison method and the applicable ANSI/NETA MTS suggested-action tier. The CTE color then visually represents that result for students and report users.
This distinction matters. Similar-component comparisons and component-to-ambient comparisons do not use the same ΔT ranges. Historical trends, manufacturer limits, equipment ratings, load, environment, emissivity, reflected energy, thermal pattern, and asset criticality can influence the professional recommendation, but they do not independently change the measured NETA comparison tier.
📊 Why the Change Matters
The transition from a recommended practice to a standard gives electrical maintenance programs a much more defined framework. Organizations using NFPA 70B now have clear “shall” requirements within the standard rather than relying only on advisory “should” language.
• Electrical maintenance program development and documentation
• Equipment condition assessment
• Defined maintenance tasks and intervals
• Infrared thermography where applicable
• Documentation of findings and inspection conditions
• Corrective action and maintenance records
How NFPA 70B applies to a particular facility depends on the adopted requirements, the facility’s governing documents, and the equipment involved. Avoid blanket claims that failure to perform thermography automatically causes an insurance denial, OSHA penalty, or civil liability. Those outcomes depend on the specific facts, applicable law, contractual requirements, and the circumstances of the event.
🎥 Detailed Breakdown Video
🧰 What This Means for Electricians & Inspectors
• Know which edition of NFPA 70B applies to the facility or maintenance program
• Perform thermography using the correct comparison method and documented inspection conditions
• Work within the facility’s electrical safety program and applicable NFPA 70E requirements
• Document findings, references, load conditions, limitations, and corrective recommendations
• Use ANSI/NETA MTS suggested-action criteria when assigning the applicable thermographic action tier
• Treat CTE™ colors only as a visual mapping of the technical result — not as a separate industry standard
🚨 Bottom Line
The important change is real: beginning with the 2023 edition, NFPA 70B moved from a Recommended Practice to the Standard for Electrical Equipment Maintenance, and the current 2026 edition continues that standards-based approach.
Infrared thermography is now firmly incorporated into that maintenance framework. The defensible way to apply it is to use the correct ΔT comparison, document the inspection conditions, interpret the result using the applicable technical criteria, and make a professional recommendation based on the complete evidence — not simply on a camera image or a CTE color.
