The Hot Plug Indicator: Why 52°C?

  • Experience form conducting thermal camera surveys of office plugs and extension leads shows that plugs and extension sockets normally operate at temperatures between 20˚C – 35˚C.
  • The HPI 52˚C set point aligns just above the first-degree burn range of 44˚C – 51˚C (First-degree burns are one of the mildest forms of skin injuries, and they usually don’t require medical treatment).
  • In addition, the American Society for Testing & Materials, and in particular from the pain threshold table for skin tissue in document C1055-99; 52˚C is the mid-point of the “severe pain” temperature band (pain is between 44˚ – 60˚C).
  • The Handbook of Electrical Hazards and Accidents quotes 46˚C as intolerable for the skin.

If all visual checks are ok and the plug/adaptor are safe to use, it is recommended that you do not leave the plug/adaptor unattended when in use.  Replace the hot plug indicator for new and be vigilant when using the plug/adaptor.  Always remember to switch off your electrical items when they are not in use.

Electrical Safety First; Visual Checks App

Also, download the Electrical Safety First; Visual Checks App.

This allows anyone to do a quick, visual check, to ensure their home is electrically safe.  Designed to be as easy-to-use as possible, the app highlights potential dangers in each room