When inspecting the interior of a stainless steel outdoor electrical box distribution box, pay attention to the copper or tin-plated terminals on the base plate or side walls. These locations are usually marked with grounding symbols for easy cable crimping. Without proper grounding, electrical systems can become hazardous for people, equipment, and the overall reliability of power distribution. Whether you're a seasoned pro or just starting out, this comprehensive guide will give you practical. Earthing refers to an electrical connection to the extensive mass of the earth, which consists of soil, rock, and similar materials, and is significantly larger in scale than the electrical system in question.