PSD 41/08 is a part of Powersem, a UK electrical safety standard. It was developed by The Institution of Engineering and Technology and comprises a set of safety requirements, based on the Electricity at Work Regulations 1989, for the design, construction, installation, maintenance and use of equipment for electrical power distribution and control. PSD 41/08 outlines the requirements for power control and distribution systems, including those associated with electrical appliance and switchgear. It encompasses requirements for the layout, selection and installation of the components of an electrical power distribution system and provides guidance on how to ensure the safety of both personnel and the equipment.