Axis India

Earth rods, known as ground rods in North America, are essential for any effective earthing system. These rods ensure fault currents are safely directed into the ground, protecting electrical systems and structures.   Conducting the following six essential tests to guarantee their effectiveness and durability is crucial.   Let's dive in!   Electrical Resistivity Test This test measures the earth rod's electrical resistance to ensure it meets international earthing standards. Current is injected through one pair of leads using the 4-wire method, and the voltage drop is sensed across the rod with another pair. For copper-bonded rods, resistivity should be around 0.25 micro ohm meters, per IEC 62561-2 standards.   2.      Coating Thickness Test This test checks the earth rod's coating thickness to prevent corrosion and ensure proper electrical conductivity. Conducted according to IEC 62561-2:2018, it verifies that the coating m...

Surge Protection Devices (SPDs) protect sensitive electronic and electrical equipment from transient overvoltages. These devices play a crucial role in any structure's internal lightning protection, making them the most efficient and commonly used type of overvoltage protection.   Why Surge Protection Matters Electrical devices can malfunction or suffer damage when surge voltages exceed their impulse voltage ratings. Surges, often reaching high kilovolt levels, are transient—they occur in concise bursts but carry high energy, enough to damage equipment. These surges can be triggered by lightning strikes, switching operations, and electrostatic discharges. Although they last only a few microseconds to several hundred microseconds, their short duration and high amplitude can cause sudden and potentially damaging voltage spikes.   How Surge Protection Devices Prevent Electrical Fires The primary role of SPDs is to limit the voltage supplied to an electric device by ei...