An earth rod to lug clamp is a type of connector used to attach a ground wire or cable to an earth rod. Earth rods are typically made of copper or galvanized steel, and are used to provide a low-impedance path for electrical current to flow to the ground. The lug clamp is usually made of copper or brass and is designed to securely connect the ground wire or cable to the earth rod.

Earth rod to lug clamps are often used in grounding systems for buildings, electrical equipment, and power systems. They provide a reliable and efficient connection between the ground wire and the earth rod, which helps to protect against electrical hazards such as electric shock, power surges, and lightning strikes. These clamps may also be referred to as grounding rod clamps or earth rod connectors.