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19 relations: AC power plugs and sockets, Alternating current, Appliance classes, Clapham Junction rail crash, Direct current, Electric current, Electrical injury, Electrical network, Ministry of Transport, Overlap (railway signalling), Railway signalling, Redundancy (engineering), Relay, Single-wire earth return, Switch, Train, United Airlines Flight 811, Washaway, Wrong-side failure.
AC power plugs and sockets
AC power plugs and sockets are devices that allow electrically operated equipment to be connected to the primary alternating current (AC) power supply in a building.
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Alternating current
Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.
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Appliance classes
In the electrical appliance manufacturing industry, the following IEC protection classes are defined in IEC 61140 and used to differentiate between the protective-earth connection requirements of devices.
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Clapham Junction rail crash
On the morning of 12 December 1988, a crowded passenger train crashed into the rear of another train that had stopped at a signal, just south of Clapham Junction railway station in London, and subsequently sideswiped an empty train travelling in the opposite direction.
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Direct current
Direct current (DC) is the unidirectional flow of electric charge.
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Electric current
An electric current is a flow of electric charge.
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Electrical injury
Electrical injury is a physiological reaction caused by electric current passing through the (human) body.
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Electrical network
An electrical network is an interconnection of electrical components (e.g. batteries, resistors, inductors, capacitors, switches) or a model of such an interconnection, consisting of electrical elements (e.g. voltage sources, current sources, resistances, inductances, capacitances).
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Ministry of Transport
A Ministry of Transport or Transportation is a ministry responsible for transportation within a country.
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Overlap (railway signalling)
An overlap in railway signalling is the length of track beyond a stop signal that is proved to be clear of vehicles in the controls of the previous signal, as a safety margin.
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Railway signalling
Railway signalling is a system used to direct railway traffic and keep trains clear of each other at all times.
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Redundancy (engineering)
In engineering, redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the form of a backup or fail-safe, or to improve actual system performance, such as in the case of GNSS receivers, or multi-threaded computer processing.
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Relay
A relay is an electrically operated switch.
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Single-wire earth return
Single-wire earth return (SWER) or single-wire ground return is a single-wire transmission line which supplies single-phase electric power from an electrical grid to remote areas at low cost.
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Switch
In electrical engineering, a switch is an electrical component that can "make" or "break" an electrical circuit, interrupting the current or diverting it from one conductor to another.
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Train
A train is a form of transport consisting of a series of connected vehicles that generally runs along a rail track to transport cargo or passengers.
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United Airlines Flight 811
United Airlines Flight 811 was a regularly scheduled airline flight from Los Angeles to Sydney, with intermediate stops at Honolulu, and Auckland.
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Washaway
A washaway is a particular kind of landslide that can affect man-made structures such as cuttings, embankments and bridges.
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Wrong-side failure
A wrong-side failure describes a failure condition in a piece of railway signalling equipment that results in an unsafe state.
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