a member of an approved body to inspect and 'sign off' notifiable aspects of any work of a third party such as DIYer whose work is of a suitable standard. This is intended to free up local authorities, who often do not have suitably qualified building control staff themselves. Due to uncertainty about who then becomes responsible for any hidden wiring, very few electricians are happy to sign off an installation that they have not been party to from the outset, and been able to agree stages to inspect and test before any covering in. See also AC power plugs and sockets: British and related types (contains more detailed history of electrical wiring styles in the UK) Electrical wiring in North America Pattress Technical standards in Hong Kong References ASEE Illustrated Guide to the IEE Wiring Regulations (15th Edition 1981), The Association of Supervisory and Executive Engineers (Not found as at March 2014) Further reading BS 4662:2006 Boxes for flush mounting of electrical accessories – Requirements, test methods and dimensions. British Standards Institution. External links IEE Wiring Regulations Electrical Safety at Work, Health & Safety Executive Electrical standards and approved codes of practice, Health & Safety Executive General Cable - Imperial / Metric Conductor Size Comparison Chart Approved Document P for guidance on Part P of the Building Regulations Local Authority Building Control Part P Competent Persons Register Electrical safety in the United Kingdom Electrical wiring Science and technology in the United Kingdom