EF
EF EARTHING
Product Info:
A well-prepared earthing system is vital to the function of the lightning protection system.
The earth has a certain level of resistance. The voltage of the earth rises sharply when it receives a 500A to 150,000A transients from the downconductor. The electric potential falls exponentially away from the point of lightning reception. This phenomena is called the step potential, which can cause injury to pedestrian and properties. Normally, the lightning protection earthing system should be situated away from pedestrian sidewalks.
The measured resistance of the earthing at the point of lightning reception should be below 5. Under no circumstances should the earth resistance exceed 10 ohms.
Website : www.ef-international.ch
