A PAT test is like an MOT; it’s as good as the day it is done. An electrical appliance can be damaged later that day or any time after, making it unsafe, which is why it is good practice to retest as often as a risk assessment recommends, and to ensure you are doing your own in-house checks before use. Checking appliances regularly ensures any faults are found and dealt with, hopefully before they become a major issue, but by doing so you should be doing enough to satisfy investigators in the event of an accident. That is why we PAT test. PAT, or Portable Appliance Testing is a process to make sure electrical equipment fitted with a plug is safe to continue using, and is an important part of health and safety.