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.
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