An earthing system is a critical safety method used in electrical installations to protect both human life and equipment from the risk of electric leakage. In the event of a fault, it safely directs current into the ground, preventing fire hazards, electric shock, and equipment damage.
📜 Legal requirement: Under the Electrical Internal Installation Regulation and the Electrical Facilities Earthing Regulation, earthing installations are mandatory in residential buildings, commercial properties, and industrial facilities.
Earthing measurements must be carried out by licensed electrical engineers holding an SMM certificate, in compliance with relevant regulations. These inspections confirm that the system operates safely and meets legal standards.
🏭 Fixed facilities: Once a year
🔧 Portable machines/equipment: Every 6 months
💡 Industrial facility earthing measurement intervals may vary depending on operational risk and regulatory classification.
🛡 Protective Earthing – Protects people and animals from touch voltage during electrical faults. Common in motor housings, control panels, and escalator surfaces.
⚙ Operational Earthing – Protects electrical circuits from high voltage surges, ensuring system‑to‑earth voltage remains within safe limits.
🎯 Functional Earthing – Installed for a specific operational purpose requested by the facility.
🌩 Lightning Protection Earthing – Directs high impulse currents from lightning safely into the ground. Often used with lightning arresters and surge protection devices.
TN System (TN‑C, TN‑S, TN‑C‑S) – Directly earthed point; exposed conductive parts connected to this point.
TT System – Separate earthing electrode; operational and protective earthing are independent.
IT System – Transformer star point isolated from earth or connected via high impedance; first phase‑to‑earth fault does not interrupt operation.
💧 Soil moisture content
📐 Electrode type, size, and placement
🪨 Soil composition (sandy, clay, rocky)
🚫 Presence of non‑metallic pipes/channels
📡 Electrical noise sources
The most common method is the two‑stake (three‑probe) technique. Electrodes are typically placed 5 meters apart; moist soil helps reduce resistance and improve conductivity. In large facilities, more precise methods such as four‑wire testing may be used.
⚡ Power generation, transmission, distribution centers: Every 2 years
🌐 Transmission lines: Every 5 years
🏭 Industrial plants and business centers: Annually
💥 Hazardous/explosive material facilities: Annually
🛠 Fixed equipment: Annually
🔧 Portable equipment: Every 6 months
🔌 Don’t put your electrical installation at risk. 📞 Contact us today to schedule your earthing measurement and system inspection with certified engineers. ✅ Fully compliant with regulations, certified, and reliable service.
📧 info@yesilgrupenerji.com
📞 +90 505 696 61 00