Regulation 11 of PUWER places an absolute duty on the employer to prevent contact between people and dangerous machine parts by either preventing access or stopping the movement of the part. The following hierarchy of control must be followed ‘so far as is reasonably practicable’: fixed guards; other guards or protection devices; protection appliances (e.g. push sticks); information, instruction, training and supervision. This is to prevent or control exposure to mechanical hazards. Exposure to other hazards (e.g. scalds and burns, falling or ejection of articles) must also be prevented or controlled. Equipment should have clearly marked starting and stopping controls. Suitable means of isolation from sources of energy are also required. Equipment must be stable to prevent collapse or overturning and suitable lighting must provided.