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Upgrading LPS

Dual Earth Electrode System and Type B Buried Earth Ring

Project Overview

  1. 50kA (10/350) Iimp Type 1 Surge Protection Device (SPD): A key feature of this upgrade is the installation of a Type 1 SPD, capable of managing lightning impulses of up to 50kA with a 10/350 µs waveform. This device is essential for protecting electrical infrastructure against lightning-related damages.

  2. Dual Earth Electrode System with Type B Buried Earth Ring: The project incorporates a dual earth electrode system combined with a Type B buried earth ring. This configuration is designed to improve the dispersion of electrical currents, enhancing system safety and reducing the potential for faults.

  3. Optimised Earth Resistance – 3.3 ohms: Achieving an earth resistance of 3.3 ohms is a significant aspect of the project, indicating effective dissipation of excess currents into the ground in the event of a fault or lightning strike.

  4. Removal of Fortuitous Earths: The project also involved removing all fortuitous earths from the system to prevent unintended electrical current paths, thus minimising safety risks.

  5. Parallel Calculation with Individual Rods – 2.9 ohms: Conducting parallel calculations with individual rods resulted in an earth resistance value of 2.9 ohms, further confirming the efficiency of the upgraded earth electrode system.

Implications and Benefits

The upgrade represents a focused effort to enhance electrical safety and infrastructure reliability. The inclusion of a Type 1 SPD and the improved earth electrode system are expected to offer better protection against electrical hazards, particularly in regions prone to lightning activity.

While this project is specific in nature, it exemplifies the ongoing efforts to improve electrical safety standards. The enhancements made are practical and geared towards ensuring the long-term stability and safety of electrical systems.

This initiative is an example of the importance of regularly updating and maintaining electrical infrastructure, reflecting a commitment to safety and efficiency in electrical system design and operation.

Keep up to date with our blog for the latest insights into electrical safety enhancements and cutting-edge technological advancements in the realm of electrical infrastructure. If you're curious to learn more about our services and how we can assist you, please don't hesitate to contact us. We're here to help you navigate and implement the best solutions for your electrical needs.


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ETTS is a Pembrokeshire based company specialising in the maintenance, testing and inspection of electrical installations and equipment, particularly on high level lighting and hazardous areas.


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