The earthing material that is
electrically conductive and a fault current will flow to 'earth' through the
live conductor, provided. This is to prevent a potentially live conductor
from rising above the safe level. All exposed metal parts of an electrical
installation or electrical appliance must be earthed.
Workshop
Few topics generate as much controversy and argument as that of Lightning
and Surge Protection of electrical and electronic systems. Poor practices in
Earthing and incorrect application and selection of Lightning and Surge
protection devices can be the cause of continual and intermittent
difficult-to-diagnose problems in a facility, often resulting in lost
production and equipment failure. This workshop looks at these issues from a
fresh yet practical perspective and enables you to reduce expensive down
time on your plant and equipment to a minimum by correct application of
these principles. This workshop is designed to demystify the subject of
Lightning, Surge Protection and Earthing and presents the subject in a
clear, straightforward manner. Installation, testing and inspection
procedures for industrial and commercial power systems will be examined in
detail. Essentially this course is broken down into the methods used to
prevent lightning entering a facility such as dissipation arrays and those
that divert surge energy away from sensitive equipment. Dissipation systems
are discussed with associated earthing systems. Surge protection devices
(surge arrestors) are dealt with by discussing the unique properties of the
different devices to enable the delegate to select the correct device suited
to the application required. Earthing and surge protection for
Telecommunications and IT systems are examined in detail. Finally, the
impact of lightning is examined and simple techniques for minimizing its
impact described.
The
main objectives of the earthing are to: 
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