earthed earth terminal

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• Earth leakage circuit breaker — An Earth Leakage Circuit Breaker (ELCB) is a safety device used in electrical installations with high earth impedance to prevent shock.PurposeMany electrical installations have a relatively high earth impedance. This may be due to the use of a… …   Wikipedia

• Electrical bonding — is the practice of intentionally electrically connecting all metallic non current carrying items in a room or building as protection from electric shock. If a failure of electrical insulation occurs, all metal objects in the room will have the… …   Wikipedia

• Consumer mains wiring — Đomestic consumer mains wiring refers to the wiring in the house hold premises and low voltage installations. Even though arbitrary electric wiring demands detailed calculations for selection of conductor sizes, circuit breakers, voltage drops… …   Wikipedia

• Portable appliance testing — For other uses, see PAT (disambiguation). A common label for certifying that a device has been tested. Portable appliance testing (commonly known as PAT or PAT Inspection or PAT Testing) is a process in the United Kingdom, New Zealand and… …   Wikipedia

• Appliance classes — In the electrical appliance manufacturing industry, the following IEC protection classes are used to differentiate between the protective earth connection requirements of devices. Contents 1 Class 0 1.1 Class 01 2 Class I 3 …   Wikipedia

• London Underground infrastructure — The infrastructure of the London Underground includes 11 lines, which serve 268 stations by rail. Lines on the Underground can be classified into two types: subsurface and deep level. Lines of both types usually emerge onto the surface outside… …   Wikipedia

• Wired logic connection — A wired logic connection is a logic gate that implements boolean algebra (logic) using only diodes and resistors. It differs from a digital logic integrated circuit which utilizes transistor transistor logic (TTL). A wired logic connection can… …   Wikipedia

• Electrical polarity — (positive and negative) is present in every electrical circuit. Electrons flow from the negative pole to the positive pole. In a direct current (DC) circuit, one pole is always negative, the other pole is always positive and the electrons flow in …   Wikipedia

• Lightning rod — A lightning rod (USA) or lightning conductor (UK) is a single component in a lightning protection system. In addition to rods placed at regular intervals on the highest portions of a structure, a lightning protection system typically includes a… …   Wikipedia

• Maritime mobile amateur radio — An emergency portable boat radio transceiver, Museal ship S/S Sołdek in Gdańsk, Poland Most countries amateur radio licences allow licensed operators to install and use radio transmission equipment while at sea. Such operation is known as… …   Wikipedia

• Synchrocyclotron — A synchrocyclotron is a cyclotron in which the frequency of the driving RF electric field is varied to compensate for the mass gain of the accelerated particles as their velocity begins to approach the speed of light. This is in contrast to the… …   Wikipedia