Electrical wiring in the United Kingdom is commonly understood to be an electrical installation for operation by end users within domestic, commercial, industrial, and other buildings, and also in special installations and locations, such as marinas or caravan parks. It does not normally cover the transmission or distribution of electricity to them. Installations are distinguished by a number of criteria, such as voltage (high, low, extra low), phase (single or three-phase), nature of electrical signal (power, data), type and design of cable (conductors and insulators used, cable design, solid/fixed or stranded/flexible, intended use, protective materials), circuit design (ring, radial), and so on. Electrical wiring is ultimately regulated to ensure safety of operation, by such as the building regulations, currently legislated as the Building Regulations 2010, which lists "controlled services" such as electric wiring that must follow specific directions and standards, and the Electricity at Work Regulations 1989. The detailed rules for end-use wiring followed for practical purposes are those of BS 7671 Requirements for Electrical Installations. (IET Wiring Regulations), currently in its 18th edition, which provide the detailed descriptions referred to by legislation. UK electrical wiring standards are largely harmonised with the regulations in other European countries and the international IEC 60446 standard. However, there are a number of specific national practices, habits and traditions that differ significantly from other countries, and which in some cases survived harmonisation. These include the use of ring circuits for domestic and light commercial fixed wiring, fused plugs, and for circuits installed prior to harmonisation, historically unique wiring colours. Common terminology Regulatory BS 7671 "Requirements for Electrical Installations. IET Wiring Regulations" (the regs, or wiring regs) these are detailed rules for the design, installation and sign-off for end-user electrical installations. Compliance with BS 7671 is not mandatory, but official guidance states following BS 7671 is one way to demonstrate compliance with the building regulations. Building regulations - "Part P" Section of the Building Regulations for England and Wales addressing electrical wiring and safety in residential situations and outbuildings. Local authority building control (LABC; building control) Local council department responsible for overseeing and administering building regulations. Competent person scheme Private organizations authorised by the state to supervise, accredit, and control the registration of installers. In the case of domestic installations such schemes operate Notification of works to LABC. Electrical installation condition report (EICR, ICR); previously the periodic inspection report (PIR) Formal report/certification of the condition