Seconded.No legal requirment.. However - The main requirement is to have the confidence of the person commissioning the job, and to know what their house rules are in terms of making it work with the rest of the installation and perhaps any conditions their insurers may stipulate - for example Churches and some brewery chains have their own rules, not in law, but you will have to follow them to get the job.

Mike.

The question has been answered above (or below if you choose), but there is potentially legal liability for failing to do a good job. That may be a breach of contract - there is an implied term that the work will be to a satisfactory standard. Then there is the law of tort, i.e. if the work is negligent, you will be liable.  A wise electrician will insure himself or herself. As far as I can recall, I never had to prove my competence to my insurers, but as a member of a CPS, I never really had to.

The question has been answered above (or below if you choose), but there is potentially legal liability for failing to do a good job. That may be a breach of contract - there is an implied term that the work will be to a satisfactory standard. Then there is the law of tort, i.e. if the work is negligent, you will be liable.  A wise electrician will insure himself or herself. As far as I can recall, I never had to prove my competence to my insurers, but as a member of a CPS, I never really had to.