Electrical services should have grounding components at the main service that are designed to protect the system from lightning strikes and problems that could occur with the power lines from the utility. This system is different from outlet/receptacle grounding. Commonly installed components in this system are an 8-foot-long copper-plated rod driven into the ground and a connection to the main water service piping. In newer construction, a connection may be made to the reinforcing steel inside the foundation, rather than to a driven ground rod. These connections may not be accessible or visible.
Bonding or connecting together all the metal water and gas piping, usually at the water heater, is recommended to prevent piping systems from becoming electrically live, which could occur if an energized wire were to contact the plumbing system.