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Definitions (120)
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Absorption loss
The attenuation of an electromagnetic wave as it passes through a shield. This loss is due primarily to induced currents and the associated resistance loss.
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ACCESS WELL
A small covered opening in the earth using concrete, clay pipe or other wall material to provide access to an earth electrode system connection.
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ACTION INTEGRAL
Defines the energy in any portion of the current path per ohm resistance. Measured in joules per ohm.
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air terminal
The lightning rod or intended attachment conductor placed on or above a building, structure, tower, for the purpose of intercepting lightning.
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AIR-TERMINATION SYSTEM
Part of the external LPs which is intended to intercept lightning flashes.
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ambient field
The electric field strength of the atmosphere at rest, in clear air and under static-free conditions. Generally thought to be some 150-300v/m at standard temperature and pressure.
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Arc
A low-voltage, high-current electrical discharge that occurs at the instant two points, through which a large current is flowing, are separated.
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arrester
Components, devices or circuits used to attenuate, suppress or divert excess electrical (surge and transient) energy to ground. The terms arrester, suppressor and protector are used interchangeably ex [..]
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Bond
The electrical connection between two metallic surfaces established to provide a low resistance path between them.
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