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Omega Red The UK Market Leader in Electrical Earthing and Lightning Protection

Why is Specialist Earthing Design Important?

The use of professional, competent earthing design specialists will result in an earthing solution that is appropriate to the installation. Designers must also ensure that the transfer potential limits for the UK, as set by the International Telecommunication Union (ITU), are not exceeded. Unless the system is properly designed, a fault current may give rise to one of the following phenomena:-

Transfer Potential

The ability of a potential voltage to induce a current in a metallic object buried near an earthing system.

Step Potential

A potential difference that develops across the feet of a person standing near to a buried earthing system and that may cause a harmful current to flow through the body.

Touch Potential

A potential difference that develops when a person touches a metal object connected to a nearby earthing system. This may cause a harmful current to flow through the body.

A "hot site" is one where the ground potentials cannot be reduced below the ITU recommended values, and where special procedures must therefore be considered. Conversely, a "cold site" is one where the ground potentials have been designed to meet the ITU recommended values so that, in the event of an electrical fault, the area remains safe for both personnel and equipment. To prevent or limit dangerous ground potential voltages, designers must consider not only the resistance value of the earthing system, but also the type and layout of the materials used. These must be carefully chosen to allow the safe dissipation of current into the ground. Consideration must therefore be given to the shapes and sizes of tapes, rods, mats and plates as well as their depth and location in the ground.

The combination of Omega's sophisticated computer software and our professional designers will establish the optimum location for earthing system components within the optimum electrical earthing solution.

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