Fundamentals of Infrared Electrical Inspection

I. Thermal imaging fundamentals

Objective: Understand what an infrared camera measures and when thermal imaging is a reliable inspection tool.

• Thermal energy vs temperature vs heat (what’s actually being measured)
• Heat transfer basics (conduction, convection, radiation) and why patterns form
• “Hot” vs “abnormal” (context, comparison, and why load matters)
• Common limitations (line-of-sight, ambient effects, reflections, wind/sun)
• What IR is good at finding vs what requires follow-up testing

II. Emissivity, reflectivity, and measurement accuracy

Objective: Capture temperature data that is trustworthy enough to support maintenance decisions.

• Emissivity and why shiny surfaces mislead
• When to trust temperature numbers vs rely on pattern comparison
• Practical field techniques to improve readings (surface prep, reference points)
• Distance, angle, and spot size effects on accuracy
• Typical materials and what to watch for (painted, oxidized, insulated, wet)

III. Camera setup and operation (hands-on)

Objective: Operate a thermal camera confidently and capture repeatable, useful images.

• Focus discipline (why it changes everything)
• Range, level/span, palettes, and what each setting is “for”
• Spot measurements, boxes/areas, and basic trending discipline
• Capturing thermal + visual images and consistent framing
• Best practices for scanning technique and repeatability

IV. Electrical inspection targets and “what normal looks like”

Objective: Recognize typical electrical thermal patterns and identify likely problem categories.

• Connections (loose/oxidized), lugs, bus joints, and terminal heating
• Load-related heating vs fault-related heating
• Imbalance indicators (single-phase loading, uneven heating)
• Breakers, disconnects, contactors, fuses and what to look for
• Interpreting gradients and comparing like-for-like components

V. Safety during infrared inspections

Objective: Perform IR inspections around energized equipment without increasing shock/arc-flash risk.

• Planning the scan as a job (task briefing, access, boundaries)
• Safe positioning and approach habits (cameras, straps, distractions)
• Panel opening considerations and maintaining control of the environment
• PPE basics for scanning work (what’s appropriate and why)
• Situational awareness in electrical rooms (people movement, housekeeping, lighting)

VI. Analysis and decision-making

Objective: Turn thermal observations into defensible maintenance decisions and priorities.

• Pattern interpretation: hotspots vs footprints vs “normal warm”
• Severity thinking: monitor vs schedule vs urgent action
• False positives/false negatives and how to sanity-check findings
• When IR triggers follow-up tests (torque, electrical testing, vibration, etc.)
• Writing clear recommendations (what to do next and why)

VII. Reporting, work orders, and program basics

Objective: Convert IR findings into documentation that drives corrective work and proves results.

• What to document every time (asset ID, location, load, ambient, access limits)
• Basic software workflow (import, annotate, compare, report)
• Work order writing that maintenance can execute (clear, specific actions)
• Re-inspection to verify repairs and close the loop
• Building a simple inspection cadence and trending approach