Copper-bonded earth rods are driven into soil to provide low-resistance grounding paths for substation electrical systems.

Earth Rod Specifications

• •Core: High-strength steel
• •Coating: Electroplated copper (min 0.25mm)
• •Diameter: 14mm to 20mm typical
• •Length: 1.5m to 3m standard sections

Installation Methods

• •Driving: Pneumatic or manual hammering
• •Coupling: Threaded connections for extension
• •Depth: Until desired resistance achieved
• •Protection: Rod cap during driving

Connection Details

• •Compression clamps or exothermic welds
• •Above-ground connection in inspection pit
• •Protection from mechanical damage
• •Corrosion prevention at soil line

Performance

• •Target resistance: <1 ohm for substations
• •Parallel rods for lower resistance
• •Soil treatment for high-resistivity areas