What is an Earth Electrode?
Earth Rods are a type of Earth Electrode. An Earth Electrode is a conducting element buried directly in the ground, facilitating the flow of fault currents towards the ground. This means that Earth Electrodes are metallic and, since they have to be buried for long periods of time, they need to be resistant to corrosion as well. Earth Electrodes can come in a variety of materials, shapes, sizes, and arrangements including pipes, plates, a ring around the structure (known as Type B Earthing), or as an Earth Rod. These Rods are also commonly referred to as Ground Rods in North America. You can see Axis’s range of Earth Rods here or download our catalogue!
Earthing is an important part of Lightning Protection, you can learn the basics of Earthing and Lightning Protection in the video below. https://www.youtube.com/watch?v=obkUNBH1xnY
Solid Copper Earth Rods
They are one of the best choices for Earth Electrodes. They can be used in areas with high corrosion or in applications where an exceptionally long life is needed. They are also used in installations with high fault currents. These Solid Copper Rods are manufacturing from Solid Copper bars and are then processed to enable jointing. These Solid Copper Rods however are not suitable for deep driving into the ground because of the possibility of bending and are additionally significantly more expensive than the other Rod options.
Copper Bonded or Copperbond Earth Rods
They are made using an electroplating process where a layer of Copper is deposited on a steel core. Copper Bonded products offer an advantage over Copper clad products because they are molecularly bonded with the steel core and will thus not slip or tear when they are driven into the ground. Copper Bonded Rods are also significantly more cost effective than Solid Copper Rods while still providing corrosion resistance and low electrical resistance. Additionally, the steel core makes these Copper Bonded Rods more favourable to be driven into the ground.
Thus, Copper Bonded Rods provide high tensile strength using low carbon steel with molecularly bonded 99.9% pure electrolytic copper. This makes Copper Bonded Rods the most economically efficient and popular choice for Earth Rods around the world. Axis has more than 25 years of experience manufacturing and selling Copper Bonded Rods to utilities and other customers in more than 80 countries. Contact us to find out more about our products!
Stainless Steel Earth Rods
These Rods are generally used where they may be issues caused by galvanic corrosion because of dissimilar metals buried closed together. However, these are the most expensive of all the options.
Galvanised Steel Earth Rods
These rods are made up of high strength low carbon steel and hot-dip galvanised. These are the lowest cost rods but also have the lowest corrosion resistance and low electrical conductivity and current carrying capacity.
Benefits of Earth Rods
Earth Rods and their accessories provide high fault current capacity for LV, MV and HV substations, towers and other distribution applications. They can be used for both overhead and underground networks to achieve optimum earthing for distribution and transmission.
Earth Rods are one of the most popular Earth Electrodes used globally because
- Copper Bonded Earth Rods are the most economical method of achieving a low earth resistance.
- They are easy to install in soil conditions that are free from rock and boulders. Copperbond Earth Rods provide high tensile strength using low carbon steel with molecularly bonded 99.9% pure electrolytic copper and thus can be easily driven into the ground with a driving rod hammer without needing to dig a large trench.
- They are designed to be extendable. Highly conductive copper couplers are used to join multiple rods together to achieve the desired length to access lower resistance soil deeper in the ground.
- When space is a constraint, vertically driven rods are a much more space-efficient method of earthing.
- They are corrosion resistant.
- Their compact design makes them easy to store and transport over long distances.
You can view our wide range of Earth Rods in a variety of sizes here. You can contact us if you want a quotation or have any further questions regarding Axis Earth Rods.
This article is part of our series of articles on Lightning Protection, Surge Protection & Earthing, you can read more with the following links:
Lightning Protection System Design and Products
Surge Protection Devices (SPD)
Lightning Protection Zones and their Application to SPD Selection
For more information, please contact us at www.axis-india.com/contact-us
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