One of the principal terms that accompanies the employment relationship is that the employer will provide a "safe system of work". As the industrial revolution developed, accidents from a hazardous working environment were a front line target for labour legislation, as a series of Factories Acts, from 1802, required minimum standards in workplace cleanliness, ventilation, fencing machinery, not to mention restrictions on child labour and limits to the working day. These Acts typically targeted particular kinds of workplaces, such as mines, or textile mills, before the more generalised approach took hold now seen in the Factories Act 1961. That applies to any workplace where an article is made or changed, or animals are kept and slaughtered. The Employer's Liability (Defective Equipment) Act 1969 made employers automatically liable for equipment with defects supplied by third parties. Because isolated employees lack the technical skill, time, training to litigate, such regulation's primary line of enforcement was through inspectors or agencies before matters went to court. Today the Health and Safety at Work etc. Act 1974, enforced by the Health and Safety Executive, is the main law. The HSE can delegate enforcement to local authorities, whose inspectors have the power to investigate and require changes to workplace systems. In addition, HSWA 1974 section 2 foresees that employees will set up their own workplace committees, elected by the employees and with the power to codetermine health and safety matters with management. Spelling out the general duties found in HSWA 1974, are a set of health and safety regulations, which must also stay in line with the European-wide harmonised requirements of the Health and Safety Directive.