Elimination and control of risk
4.—(1)  In every workplace, the employer, self-employed person and principal shall take all reasonably practicable steps to eliminate any foreseeable risk to any person who may be affected by his undertaking in the workplace.
(2)  Where it is not reasonably practicable to eliminate the risk referred to in paragraph (1), the employer, self-employed person or principal shall implement —
(a)such reasonably practicable measures to minimise the risk; and
(b)such safe work procedures to control the risk.
(3)  The measures referred to in paragraph (2)(a) may include all or any of the following:
(a)substitution;
(b)engineering control;
(c)administrative control;
(d)provision and use of suitable personal protective equipment.
(4)  The employer, self-employed person or principal shall specify the roles and responsibilities of persons involved in the implementation of any measure or safe work procedure referred to in paragraph (2).
(5)  In this regulation —
“administrative control” means the implementation of any administrative requirement which includes a permit-to-work system;
“engineering control”  —
(a)means the application of any scientific principle for the control of any workplace hazard; and
(b)includes the application of physical means or measures to any work process, equipment or the work environment such as the installation of any barrier, enclosure, guarding, interlock or ventilation system;
“safe work procedure” means any procedure for carrying out work safely, and includes any procedure which is to be taken to protect the safety and health of persons in the event of an emergency;
“substitution” means the replacement of any hazardous material, process, operation, equipment or device with less hazardous ones.