Localized areas of greater heat are called __________?

• A. Hot spots
• B. Warm spots
• C. Heat pockets
• D. Hot zones

Answer: (A)

Hot spots are localized areas where heat is concentrated higher than the surrounding material. In electrical equipment like transformers and switchgear, these hotspots arise from resistive losses, uneven cooling, loose or high-resistance connections, or aging insulation. Detecting them is crucial because localized overheating can accelerate insulation degradation, reduce insulation life, and raise the risk of failures or fires. Operators use infrared thermography and temperature sensors to identify hotspots and take actions such as easing load, improving cooling, tightening connections, or replacing components. Other terms like warm spots, heat pockets, or hot zones aren’t the standard phrases used to describe this phenomenon in equipment manuals and field practice.