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British standards have proliferated throughout large parts of the former British Empire. Both neutral and line carry current and are defined as live parts. Distinctive characteristics of the system are shutters on the neutral and line (see § Concepts and terminology below) socket holes, and a fuse in the plug. At various points along the line, there will be places where trains can be temporarily isolated electrically from the supply system. Sediment can be damaged by cable installation by trenching with water jets or ploughing. Interruption of the cable network during intense operations could have direct consequences for the military on the ground. Global Energy Network Institute. To reduce the risk of users accidentally touching energized conductors and thereby experiencing electric shock, plug and socket systems often incorporate safety features in addition to the recessed contacts of the energized socket. Also learn about what electric flexes and electric wires do and protected against overloading. Fused plugs and sockets of various proprietary and non-interchangeable types are found in older public buildings in the UK, where they are used to feed AC electric wall clocks. There are certain characteristics common to British mains plugs and sockets intended for domestic use. BS 546 plugs and sockets are still permitted in the UK, provided the socket has shutters.

The 1911 General Electric Company (GEC) Catalogue included several earthed sockets intended for industrial use. In 1885, two-pin plug designs appeared and in 1889 there were two-pin plugs and sockets in the GEC catalogue. Use of the BS 546 30 A plugs and sockets diminished through the 1970s as they were replaced with BS 4343 (which later became IEC 60309) industrial combo plugs and sockets. It is often associated with obsolete wiring installations or where it is found in modern wiring, it is confined to special use cases, particularly for switch-controlled lamps and stage lighting. The plug and socket replaced the BS 546 plug and socket, which are still found in old installations or in special applications. A spokesman for LV told us: 'If someone was to trip or fall over a charging cable and our customer was found legally responsible or negligent our policy would cover it under "liability to other people".

Monocable Detachable Gondolas (MDG) utilize a single cable (or "rope") for both propulsion and support. However, capacity in the Pacific Ocean was much expanded starting in the 1990s. For example, between 1998 and 2003, approximately 70% of undersea fiber-optic cable was laid in the Pacific. High-voltage direct current (HVDC) systems require relatively costly conversion equipment that may be economically justified for particular projects such as submarine cables and longer distance high capacity point-to-point transmission. Higher order phase systems require more than three wires, but deliver little or no benefit. Three of 4 bedrooms open onto outdoor areas, where you can BBQ or nap in a hammock. Electrical sockets for single phase domestic, commercial and light industrial purposes generally provide three electrical connections to the supply conductors. Plugs and sockets for electrical appliances not hardwired to mains electricity originated in the United Kingdom in the 1870s and were initially two-pin designs. As electricity became a common method of operating labour-saving appliances, a safe means of connection to the electric system other than using a light socket was needed. In the United Kingdom and in Ireland this system is usually referred to by its pin shape and is simply known as "round pin plugs" or "round pin sockets".

There is no European Union regulation of domestic mains plugs and sockets; the Low Voltage Directive specifically excludes domestic plugs and sockets. The first transmission of single-phase alternating current using high voltage came in Oregon in 1890 when power was delivered from a hydroelectric plant at Willamette Falls to the city of Portland 14 miles (23 km) down river. Line (commonly, but technically incorrectly, called live) carries the full supply voltage relative to the neutral. Early types were available fused in both poles; later types fused in the line only and provided an earth pin. These are termed neutral, line and earth. Earthed sockets are designed to be incompatible with two-pin plugs. In this article, the term 'plug' is used in the sense defined by IEC 60050. Sockets are designed to prevent exposure of bare energised contacts. An adaptor (in the context of plugs and sockets) is defined in IEC 60050 as "a portable accessory constructed as an integral unit incorporating both a plug portion and one or more socket-outlet portions". BS 546, Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50-60 Hz) circuits up to 250 V is an older British Standard for three-pin AC power plugs and sockets.

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