A copper earthing lattice (or mat) is a grid of thick copper strips riveted into a lattice pattern, used as an earth electrode in grounding systems, especially where driving earth rods is difficult, to provide a large surface area for safe dissipation of fault currents, reducing shock hazards in substations and industrial sites by minimizing step and touch potentials. It's a cost-effective alternative to solid plates, offering high conductivity, durability, and corrosion resistance for reliable grounding.