Site earthing: electrical safety and protection against indirect contact

The infrastructure needed for temporary safety in construction requires design that takes account of the chemical and physical characteristics of the soil. Dispersing fault currents into the ground is a legal requirement under Italian Legislative Decree 81/08 and is covered by technical standards, so as to ensure the prompt operation of the active protective devices upstream. The temporary system consists of a set of buried conductive elements firmly connected to one another. This network is designed to keep all exposed metal parts (such as scaffolding, cranes and site cabins) at the same potential as the ground, eliminating touch voltages that could be lethal to people in the event of an accidental electrical leak.

Vertical earth electrodes are the heart of the discharge system. The choice of profile depends closely on the compactness and resistivity of the soil. For normal or mixed soils, the classic round-section copper-bonded steel earth rod is frequently used, a component that combines excellent conductivity with considerable mechanical strength when driven deep. In particularly loose, sandy or gravelly soils, hot-dip galvanised steel cross-profile electrodes are more effective. Their lobed geometry greatly increases the contact surface with the soil, while also resisting galvanic corrosion caused by underground moisture and soil acids.

An earth rod, however perfectly driven and sized, is completely useless if the connection points are weak, loose or prone to rapid oxidation. Joints between the vertical electrodes and the main earth conductor require clamping components in brass or stainless alloys that maintain constant mechanical pressure over time. The connection to the main site switchboard is generally made with a sturdy bare copper braid or an insulated green-yellow cable with a cross-section suited to the load. These protective conductors must be firmly secured to withstand the normal vibration caused by passing site vehicles and the inevitable accidental pulling typical of work areas.

Metal components for electrical earthing, especially vertical rods, are long and heavy, which can complicate efficient warehouse organisation. FT SPA supports B2B retailers with fast deliveries direct from its logistics hub, reducing the space taken up by large on-site stocks and ensuring timely restocking during peak workloads. For display, vertical racks or tubular stands are very practical for storing metal profiles completely safely. For small connection parts, rigid compartment trays keep the department perfectly tidy, making it quick to find the right sizes and encouraging installers to shop independently.