An earthing system design is only ever as good as the quality of its installation and its present, in-ground condition. Earth resistance or fall of potential tests measure the overall earth resistance of the entire earthing system, including any secondary components such as reinforced foundations, pipes and older hessian-covered cables. These tests are conducted following initial installation of a new design, where the results are used to prove the installed earthing system meets the design specifications on which all safety calculations have been made. Tests should also be made periodically (as recommended in BS EN 50522 and EA TS 41-24) to check for degradation or damage to the earthing system as a result of corrosion, civil works or theft.

All works is carried out in accordance with the requirements of BS EN 50522.