A metal grounding rod, also called grounding electrode, embedded into the soil and connected to the main electrical panel by a single earth-grounding wire is the primary method of earthing electrical systems. Since electricity follows the path of least resistance, an appropriately earthed electrical system discharges harmful power surges to the soil safely.
The system also protects electrical devices, such as home appliances, machinery and power tools, via a three-wire power plug. The extra wire, the grounding wire, is connected to the device's circuit protection system and harmlessly carries electrical surge away to prevent electrocution of users. On some appliances, a grounding wire must be fastened to metal water pipes to prevent electrical shocks.
Factories also use grounding systems to protect equipment and machinery from accumulating static electrical charges to ensure safety of workers against electrocution.
The primary purpose of earthing is to protect life and equipment.
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