PAT testing should be carried out regularly, at least annually, and in some cases quarterly. Formal visual inspections can be carried out on an ongoing basis and should be carried out by someone with appropriate knowledge. In low-risk situations, this can be carried out by a member of staff that has received training.
For higher-risk environments, the testing should be carried out by a trained professional with expertise in the field. This also applies in cases where manual testing and inspection are required.