Furse also offer design solutions: using the latest computer aided design and modelling software to produce detailed system designs for any complexity. This produces high quality earth electrode and lightning protection designs, in compliance with globally recognised standards. Designs are tailored and installed using the most appropriate and up-to-date products. Lightning is a real and significant threat. Containing astonishing amounts of electrical energy.
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Without such a system, the safety of a structure, the equipment contained within it and its occupants are compromised. Earthing systems typically fall into but are not limited to one of the following categories: Power generation, transmission and distribution Lightning protection Control of undesirable static electricity Telecommunications The following schematic illustrates the key elements of an effective earthing system. Earth plates are used to attain an effective earth in shallow soils with underlying rocks or in locations with large amounts of buried services.
They can also provide protection at potentially dangerous places e. HV switching positions. Connectors and terminations An effective earthing system relies on joints and connections to have good electrical conductivity with high mechanical strength. Poorly chosen or badly installed joints and connectors can compromise the safe operation of an earthing system.
Furse offer a range of connectors and termination methods to suit a wide range of applications. Conductors and Earth rods As with lightning protection, the first choice faced by the designer of an earthing system is the type of conductor to be used.
The correct choice of conductor is extremely important, whether it be a simple below ground electrode or a complex computer room signal reference grid. Conductors Furse offer three types of conductor: Flat tape, solid circular and stranded cable. A range of conductor materials are available. Above ground, copper, aluminium and steel may be used.
Below ground, copper is the most common choice due to its high resistance to corrosion. It is important that earthing conductors should be correctly sized for their application, as they may be required to carry a considerable current for several seconds.
Specific data regarding conductor ratings can be found on page This illustration is designed to demonstrate the main aspects and individual components of an earthing system. It is not intended to represent an actual scheme conforming to a particular code of practice. The drawing is not to scale. Earth rods and plates In addition to the conductors outlined above, earth rods and plates or any combination thereof can be used to achieve an effective earth depending on the site conditions.
Earth rods take advantage of lower resistivity soils at greater depths than normal excavation will allow. Connections are made using the high temperature reaction of powdered copper oxide and aluminium. FurseWELD connections allow conductors to carry higher currents than other types of connections. They will never loosen, are highly conductive and have excellent corrosion resistance.
Mechanical clamps Where permanent connections are not appropriate, mechanical clamps offer the ideal solution. These are typically used on smaller scale installations where periodic disconnection for testing is required.
All Furse mechanical clamps are manufactured from high copper content alloy. They have high mechanical strength, excellent corrosion resistance and conductivity. Compression connectors For applications where exothermic welding is not appropriate for creating permanent connections, compression connectors may be used.
Compression connectors produce very robust joints which can be buried in the ground or in concrete. Earth inspection pits Regular inspection and testing of the earthing system is essential. Inspection pits allow easy access to earth electrodes and conductors to facilitate this procedure. Earth bars Earth bars are an efficient and convenient way of providing a common earth point. Integral disconnecting links mean the earth bars can be isolated for testing purposes.
Earth electrode backfills Earth electrode backfills are to be used in areas where required resistance levels are difficult to achieve. These products effectively act to increase the electrodes surface area thus lowering its resistance to earth.
Product selector 1 Conductors 2 Earth rods 3 Earth plates 4 FurseWELD exothermic welding 5 Compression connectors 6 Mechanical clamps 7 Earth inspection pits 8 Earth bars p p p79 p p p p80 p 75 How to apply earthing equipment Earthing Earth rods Earth electrode materials Quality earth rods are commonly made from either solid copper, stainless steel or copperbonded steel. Furse can supply all three types, but the copperbonded steel cored rod is by far the most popular, due to its combination of strength, corrosion resistance, and comparatively low cost.
Solid copper and stainless steel rods offer a very high level of corrosion resistance at the expense of lower strength and higher cost. Diameter of rod One common misconception is that the diameter of the rod has a drastic effect on lowering earth resistance.
This is not true! As the graph shows, you only lower the resistance value by 9. Thus the rationale is: Use the most economical rod that soil conditions will allow you to drive. This is one of the ways to ensure that you dont waste money on over-dimensioned rods.
Effect of electrode diameter on resistance Thread and shank diameters Confusion often arises between thread and shank diameters for threaded rods. The thread rolling process, used by quality rod manufacturers, raises the surface of the rod so that thread diameter B is greater than shank diameter A see drawing. They are made by molecularly bonding Furse rods are not of the sheathed type. They are highly resistant to corrosion, and because the steel used has a very high tensile strength, they can be driven by power hammers to great depths.
The counter-bored couplings are made from high copper content alloy, commercial brass is not used. This again ensures excellent corrosion resistance and high strength. Copper thickness minimum microns. Threaded copperbond earth rod.
Furse Earthing Catalogue
Without such a system, the safety of a structure, the equipment contained within it and its occupants are compromised. Earthing systems typically fall into but are not limited to one of the following categories: Power generation, transmission and distribution Lightning protection Control of undesirable static electricity Telecommunications The following schematic illustrates the key elements of an effective earthing system. Earth plates are used to attain an effective earth in shallow soils with underlying rocks or in locations with large amounts of buried services. They can also provide protection at potentially dangerous places e.
A Total Solution For Earthing & Lightning Protection
Suitable for most types of earthing and lightning protection installations. Navigate Search Login layouts-flyoutmenu-cart. Literature High voltage power earthing systems. In order to confirm your subscription to the promotions of allcatalogues. I want to receive emails Not now.
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