Using the same grounding electrode as the building electrical service keeps the conductive parts of communications equipment at or close to the same ground (earth) potential in normal operation. In abnormal events, such as surges related to lightning strikes to or close to the building, the objective of grounding and bonding in accordance with the NEC is to keep conductive parts of electrical power systems and limited-energy communications systems at the same potential, as potentials rise and fall during high-surge events such as lightning strikes.