It goes without saying that you should ensure that the electrics and electrical appliances supplied are safe in any property you let.
You should carry out your own visual inspections as landlord or agent and have periodic checks carried out by a qualified electrician.
At a minimum, you should, carry out an annual visual inspection and keep a record on a safety checklist. You should also carry out an inspection when your tenants change, recording electrical equipment, its condition and fuses fitted. Have periodic inspections of electrical equipment by a qualified electrician. It is advisable to have 5 yearly inspections by a qualified electrician to ensure safety and that the electrical system complies with current electrical regulations. Copies of the certificate for the check should be made available to your tenants. Keep all records of these inspections.
Try to avoid buying second hand appliances as they can often be near the end of their working life or are already defective. Never ignore worn flexes to appliances or discard operating instructions for appliances.