If you let property in England & Wales you must ensure that electrical equipment and the electrical systems are safe and working correctly.
There is currently no statutory requirement to have annual safety checks on electrical equipment as there is with gas, but it advisable to do so as you can still be liable if things go wrong. Failure to adhere with the Electrical Equipment (Safety) Regulations 1994 and The Consumer Protection Act 1987 is a criminal offence and may result in a fine of up to £5,000 per item for non compliance.
You are advised to make visual inspections yourself as a landlord in residential properties. This could be done as a checklist which can be dated and signed by yourself and the tenant. Periodic checks carried out by a qualified electrician on flats or houses that you let are also advisable. Ideally, ensure that the electrical system complies with the latest wiring regulations. Supplied appliances should be kept to a minimum.
Make sure these appliances are in complete working order and safe - keeping purchase receipts is a great way to keep track and retain all proof. Pay particular attention to second hand equipment £ ensure these items are checked. Operating instructions and safety warning notices should be supplied with the appliances, retaining a copy for yourself. Make sure that tenants know the location of and have access to the main consumer unit, fuses and isolator switch.
Always have a signed and dated document showing that you have gone through this with the tenant. A competent and qualified electrician must always carry out any work in the property.