All electrical equipment in your practice must be tagged and tested when it is first installed and then at regular intervals.
Test and tagging involves a visual inspection of an appliance for any damage followed by an electrical test with a Portable Appliance Tester. If the appliance is safe to use, the tester tags the appliance accordingly. If the appliance is not safe to use, the tester will tag it with it a High Visibility Failed Tag and it must be withdrawn from service immediately.
Test and tagging must be carried out by someone who has successfully completed a Test & Tag course. This will normally be an electrician, but it does not have to be.