Earth Rods

Earth Rods Earthing & Lightning Protection

Earth Rods - Copper, Galvanised & Stainless Steel

AN Wallis Earthing & Lightning Protection Distributors

 

 

Copper earth rods from Thorne & Derrick UK offer the contractor the best and most economical earth rods for structural earthing and lightning protection - AN Wallis earth rods are designed for use where extremely high corrosion resistance and long service life are required.

Earth rods and their fittings are used to provide the interface to ground in all soil conditions in order to achieve satisfactory earthing systems in overhead and underground electricity distribution and transmission networks – providing high fault current capacity on low, medium and high voltage substations, towers and power distribution applications.

Copper earth rods are produced from solid copper bar and are internally threaded for jointing - when deep driving a solid copper earth rod the usual practice is to insert the rod into a bore hole and backfill with either low resistance earthing compound or Bentonite.

AN Wallis copper earth rods provide effective earthing for all site conditions and are manufactured from 99.9% copper with excellent corrosion resistance and very high tensile strength.

Earth rods take advantage of lower resistivity soils at greater depths than normal excavation will allow - used in conjunction with copper earth plates they are used to attain an effective earth in shallow soils or in locations with large amounts of buried services eg high voltage switching positions.

AN Wallis Earth Rods - Overview

  • Solid Copper
  • Copperbond
  • Galvanised Steel
  • Stainless Steel 
Type of Earth Rod  Features & Benefits
 Copperbond  Optimum Economic Efficiency * High Corrosion Resistant * Very High Tensile Strength * Extendable
 Solid Copper  Excellent Corrosion Resistance * Aggressive Soil Applications (eg high salt) * Extendable
 Stainless Steel  Maximum Corrosion Resistance * Resist Galvanic Corrosion * Highest Material Cost * High Life Expectancy
 Galvanised Steel  Lowest Electrical Conductivity * Lowest Cost * Lowest Corrosion Resistance * Poor Current Carrying Capacity

T&D UK also stock stainless steel and galvanised steel earth rods.

Pictured : Earth Rods - AN Wallis Copper Earth Rods

Earth Rods

Solid Copper Earth Rods

 

Maximum Current Ratings of Copper Earth Rods

Resistivity Copper Bonded Steel (30%) 16mm Rod Diameter Solid Copper 16mm Rod Diameter
Protection Clearance Time 1s 2s 3s 1s 2s 3s
300Ωm 40.8kA 28.8kA 23.4kA 69.7kA 49.2kA 40.2kA
50Ωm 31.6kA 22.3kA 18.2kA 54.0kA 38.1kA 31.2kA
100Ωm 22.3kA 15.7kA 12.9kA 38.2kA 27.0kA 22.0kA
150Ωm 18.2kA 12.8kA 10.6kA 31.2kA 22.0kA 18.0kA
200Ωm 15.8kA 11.1kA 9.1kA 27.0kA 19.0kA 15.6kA

 HV High Voltage Earthing & Electrodes - Substations

Bare copper cable and copper earth rods are used as earth electrodes for HV substation earthing - for earth fault levels up to 8kA use bare stranded copper cable, for earth fault levels greater than 8kA use 120sqmm (or 2 runs of 70sqmm bare copper cables). 

>HV earth rod electrodes should be made up from 1m or 1.2m copper earth rods - in ground types expected to have high resistivity (eg sand, gravel, slate, shale, rock) additional HV electrodes or earth rods may be required to achieve the required resistance to earth.

In these earthing applications it is advisable to install bare copper electrode and earth rods in a cable trench at least 200mm underneath a high voltage HV cable (or if not possible alongside the HV cable). Source : UK Power Networks Earthing Construction Manual 2010. See link below.

Blog - Measuring Earth Resistance - What Affects Grounding Resistance?

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Earthing Construction Manual - Secondary Distribution Network Earthing (UKPN 2010)

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Earth Rods - Solid Copper Earth Rods

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Earth Rods - Copperbond Earth Rods

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Earth Rods - Stainless Steel Earth Rods

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Earth Rods - Galvanised Steel Earth Rods

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Wallis Earthing & Lightning Protection Systems Catalogue