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LPT is required under the Electricity at Work Regulations 1989. These state that lightning protection systems should be tested in accordance with the relevant British Standard BS EN 62305.
Also if a building with a poorly maintained system or a defective earth installation is struck by lightning or static electricity this can result in ‘flash-over’ to other metals within or on the structure. This can take place even without a direct strike because all lightning conductors pick up static even if the storm is 4 miles away!
A Lightning Protection Test also includes...
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Performing random continuity tests, especially continuity of those parts of the Lightning Protection System that are not visible for inspection.
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The resistance to earth of each local earth electrode and, where practical, the resistance to earth of the complete earth termination system. Each local earth electrode should be measured in isolation with the test point between the down conductor and earth electrode in the disconnection position. If the resistance to earth of the earth termination system as a whole exceeds 10 ohms, additional electrodes should be installed, where practicable, to obtain the requisite resistance value. If there is a significant increase in the value of the earth's resistance from previously measured values, additional investigations should be made to determine the reason for the increase and measures taken to improve the situation.
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The results of a visual check of all conductors, bonds, and joints or their measured electrical continuity.
