Manufactured by AN Wallis | Distributed by Thorne & Derrick
uploaded by Chris Dodds | Thorne & Derrick Sales + Marketing Manager
Copper Earth Bars for Lightning Protection Systems
Earth bars are an integral part of an Electrical oBuilding Services or Substation technical specification for earthing and bonding; they provide a convenient common earth point for the infrastructure. It is critical copper earth bars provide long lasting, high quality earthing capable of enduring any potential dangerous fault currents.
Main earthing bars provide a recognised earth connection/ reference point and allow the local substation earth resistance to be measured using a clamp meter.
Thorne & Derrick and AN Wallis are aware of the crucial role of an Earth Bar which is why they manufacture high quality, affordable earth bars that are designed and tested to all relevant standards – manufactured from hard drawn copper bar to BS EN 13601 and tested to BS EN 62561-1 Class H.
From Earthing Schematic to Earth Bar Drawing to Custom Manufactured Product.
Thorne & Derrick, UK Distributor for AN Wallis, can produce Earth Bar drawings directly from your Earthing schematic, this gives our customers a clear visual representation of the product that we can offer. This drawing can be approved (or amended) by the customer prior to us beginning the manufacturing process. This unique service ensures that the product quoted is the correct product and specification required by the customer avoiding any confusion or potential delays prior to manufacturing.
Thorne & Derrick distribute an extensive range of standard and customised special earth bars – here are the basic specification and selection factors:
You can contact us with your enquiry.
➡ Some recent examples of custom manufactured products to client specifications.
| 6 Way + Link + 1 Way Tinned Copper Earth Bar, Stainless Steel Bolts, Mounted on Insulators & Black PVC Base. |  |
| 6 Way + Link + 1 Way Plain Copper Earth Bar, Brass Bolts, Mounted on Insulators & AVG Galv. Steel Base. |  |
| 6 Way + Link Plain Copper Earth Bar, Phosphor Bronze Bolts, Mounted on Insulators & Black PVC Base. |  |
| 16 Way + Link + 2 Way Plain Copper Earth Bar, Brass Bolts, Mounted on Insulators & AVG Galv. Steel Base. |  |
| Telecommunications Earth Bar. |  |
| 24 Way Special Earth Bar (2 Rows of 12 No. for Double Holed Lugs), 100x6mm Plain Copper Bar, M10 Brass Bolts, Mounted on Insulators & AVG Galv. Steel Base. |  |
| 10 Hole Earth Bar, 50x6mm Plain Copper Bar, No Bolts, Mounted on Insulators & AVG Galv. Steel Base Feet. |  |
| 5 Way + Link + 3 Way Earth Bar, 50x6mm Plain Copper Bar, M10 Phosphor Bronze Bolts, Mounted on Insulators & Black PVC Base. |  |
| 1 Way + Link + 1 Way Tinned Earth Bar, 50x6mm Tinned Copper Bar, M10 Brass Bolts, Mounted on Insulators & AVG Galv. Steel Base. |  |
1. 20 Way Staggered Earth Bar, 50x6mm Plain Copper Bar, M6 Phosphor Bronze Bolts, Mounted on Insulators & Black PVC Base. 2. 16 Way Staggered Earth Bar, 50x6mm Plain Copper Bar, M6 Phosphor Bronze Bolts, Mounted on Insulators & Black PVC Base. 3. 10 Way Earth Bar, 50x6mm Plain Copper Bar, M6 Phosphor Bronze Bolts, Mounted on Insulators & Black PVC Base.
10 Way + Link + 1 Way Earth Bar, 25x3mm Plain Copper Bar, M10 Phosphor Bronze Bolts, Mounted on Insulators & Black PVC Base
50mm Centres
BS EN 62561-1 Class H
Rounded Copper Edges
PVC Base
PB Connection Points
BS 7430
“I have worked with Thorne & Derrick throughout my 20 year career in the Earthing & Lightning Protection industry – we have worked closely together on multiple major UK and international projects.
“We are now working together again, using the historical AN Wallis brand and our high quality earthing products coupled with the incredible Thorne & Derrick customer service, sales and marketing abilities and their exceptional digital content to bring the focus to AN Wallis so that it is the only name thought of when requiring Earthing materials / Lightning Protection products”
Earthing Bars | Standard, Single & Twin Links | Manufactured from Copper by AN Wallis
Thorne & Derrick distribute the most extensive range of Low & High Voltage Cable Installation & Electrical Distribution Equipment to the Power Transmission & Distribution industry in the onshore and offshore wind, solar, rail, oil/gas, data centre, battery storage and utility sectors.
We service UK and international clients working on underground and subsea cables, overhead lines, substations and electrical construction at LV, 11kV/33kV up to EHV transmission and distribution voltages.
Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Copper Earth Tapes, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Protection & Fusegear.
Distributors for: 3M Electrical, ABB, Alroc, Band-It, Cembre, Centriforce, CMP, Elastimold, Ellis Patents, Emtelle, Furse, Lucy Zodion, Nexans Euromold, Pfisterer, Polypipe, ProGARM, Prysmian, and Roxtec.
Specialist Electrical Equipment Distributors for High Voltage Power Systems
33kV substation earthing is provided around the transformer bund and new building structure using copper earthing tapes, electrode rods and exothermic welding (CADWELDing) of the earth rods to tape – 50mm x 4mm earth tapes are installed as a ring and cross earthing design with 40mm x 4mm copper tape braised for additional stairs and walkway earthing.
The 33kV switchgear housing within the high voltage substation is earthed and bonded to a new transformer ring and Neutral Earth Resistors (NER). The copper tapes and earthing cables are shown connected to the 10 way earth bar. To achieve the required earth resistivity reading 3 x 1.2 metre length coupled copper earth rods were driven into the ground.
Driven earth rods are used to exploit lower resistivity ground conditions where present to reduce the earth potential rise (EPR) on substation earthing and lightning protection projects from 11kV/33kV up to 400kV.
Earthing of low, medium and high voltage electrical networks is critical to ensure safe and correct operation preventing and minimising against the consequences of a direct lightning strike to equipment and buswork within substations. UK DNO’s publish primary and secondary substation earthing designs for the application of earthing systems to HV and LV underground cables and overhead line networks, typically operating at 33kV, 20kV, 11kV, 6.6kV, 3kV and 2kV.
Similarly, the National Grid publish an Earthing Technical Specification for the lightning protection of transmission and distribution systems located in the busbar protection zone of the electricity grid operating at nominal voltages of 400kV, 275kV 132kV and 66kV. The general requirements of the substation earthing systems are compliance with technical standard EA TS 41-24 and British Standards BS EN 50522 and BS7430.
➡ Read our Blog about Substation Earthing
Copper Earth Tape – the earthing tape 40mm x 4mm shown bonding to the existing medium/high voltage substation earth bar
Copper Earth Tape Dropper – 50mm x 4mm earth tape is shown earthing switch 1 of 3 on the 33kV distribution board
Earth Tapes – the 50mm x 4mm copper tapes are routed back to the rebar earths on the earth bar
Transformer Earthing – using 40mm x 4mm copper earthing tape on the 33kV high voltage transformer
Power Jointing Services Ltd established in 2007 specialising in 33kV-400V electrical network construction, establishing industrial and commercial supplies, installing residential service connections and street lighting connections. Also: High voltage service alterations, cable fault finding and replacement of assets including transformers, low voltage distribution boards and link boxes.
T&D provide competitive prices and fast delivery from stock for Earthing & Lightning Protection products including copper tapes, rods, electrodes, earth bars and ancillary items for low, medium and high voltage substations.
♦ Visit Substation Earthing for further information.
LV ♦ MV ♦ HV
T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Installation & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)
MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)
Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment
T&D’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
➡ Visit Power Blog
Published 09 Jan 2026
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