Earthing and Electrical Grounding Installation: What is it all about?

March 29, 2017

ground works

Recently, there were words said about Earthing and Ground Insulation. This was an opportunity to look into earthing theory so we could all understand the need for electrical grounding. Such concepts obviously require coverage, but we're really all about the practical work here at Metro Pits. This is a nuts-and-bolts issue, so why don't we move on to electrical grounding installation? It all begins with an earthing electrode.

Installing Earthing Electrodes

Every electrically conductive surface in a structure must be grounded. That means every tap in the bathroom, every pipe, and every electrical appliance must be connected to the grounding system. From there, the grounding wire, which is usually protected by a green insulation sheath, moves throughout the building and terminates at the earth electrode. This long metal spike binds every one of these grounded parts to the soil so that any electrical discharges are channelled directly into the Earth.

The electrode used in this example is a standard length of conductive copper. It's basically a metal spike that's hammered into the ground outside a home. These ground rods are still in use, but they're not always the right solution, especially when a larger structure requires a more fleshed out earthing solution. In this case, a large pit must be excavated. Earthing plates and grounding rings vie with arrays of rods for proper installation inside these expertly uncovered trenches.

Technology-Reinforced Installations

The reason expert electrical grounding fitters consume so much time during this work stage is simple. Basically, the resistivity, a function that relies on ground wire continuity, must be as close to zero ohms as humanly possible. Remember, electrical discharges always take the path of least resistance, so it's the grounding technician's job to provide a resistance-free pathway. Soil resistivity is assessed at first, then the plates and rods are properly configured in the ground pit. When this work is completed, the threading ground wire is bonded to the electrode(s). The ditch can now be covered, but earthing continuity tests should still be conducted as part of a regular preventative maintenance program.

Grounding wires connect exposed metal surface together inside a home or structure. This connectivity property eliminates all voltage differences between the parts, so no static charges can propagate. More importantly, though, the connected earthing wires thread their way outside. They connect securely to an earth electrode, grounding plate, or grounding ring. In larger properties, that wire becomes a thick strip of copper. Regardless of the conductor's shape or size, it must create a low-impedance connection to the ground so that any life threatening electrical discharges instantly flow to ground.

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