How often must a 3-point fall-of-potential earth resistance test be conducted on an LPS?

A 3-point fall-of-potential earth resistance test is a critical safety procedure that ensures the effectiveness of a lightning protection system (LPS). Conducting this test every 24 months ensures that any degradation in the grounding system's effectiveness is detected in a timely manner, which is essential for maintaining the safety and reliability of electrical systems.

The requirement for a 24-month interval is rooted in guidelines that emphasize regular maintenance and assessment of grounding systems to mitigate risks associated with electrical faults and lightning strikes. By performing the test at this frequency, it is possible to identify and rectify any issues, ensuring that the grounding resistances remain within acceptable limits for safety. This proactive approach helps to maintain the operational integrity of both the system and the facility using the LPS, thereby protecting personnel and equipment from potential electrical hazards.