In what condition should water and electrical systems be interconnected in lightning protection?

Water and electrical systems should indeed be interconnected when adequate grounding is present. Proper grounding is essential for the safety of electrical systems, especially in the context of lightning protection. Adequate grounding provides a safe path for lightning or electrical surges to dissipate into the earth, which can help protect both the electrical system and any connected water systems from damage.

When grounded correctly, any potential differences in electrical charge can be neutralized, which minimizes the risk of shock or fire in case of a lightning strike or electrical fault. This interconnection is essential in many systems where water pipes are used for grounding purposes, provided that the overall installation adheres to safety standards and regulations.

The importance of grounding cannot be overstated, as inadequate or improper grounding can lead to hazardous conditions. This explains why just having grounding is a critical condition for safe interconnection; without it, the risks associated with lightning or electrical faults significantly increase.