The Employer's Liability (Defective Equipment and Compulsory Insurance) (Northern Ireland) Order 1972 is legislation that regulates the requirement for employers in Northern Ireland to insure against liabilities for personal injury suffered by their employees arising out of and in the course of their employment, as well as addressing liabilities related to defective equipment. It sets out conditions for insurance policies, specifies exemptions, and outlines enforcement mechanisms. The order aims to ensure that employees are adequately protected and compensated for work-related injuries.