For IT earthing (clean earths) or lightning protection, the size calculation changes. Lightning protection earths must handle massive impulse currents, often requiring a minimum of 25mm² or 50mm² copper strip, regardless of the power cable size. A standard calculator for power circuits will not suffice for lightning protection—ensure you are using the correct tool for the job.
This is where the becomes an indispensable tool. This article explores the science behind the calculator, the standards that drive it, and how to use it effectively. earthing cable size calculator
The primary function of an earthing conductor is to provide a low-impedance path for fault current. This path must be robust enough to facilitate the rapid operation of the circuit's protective device. For IT earthing (clean earths) or lightning protection,
S=1,0002×1143=6.99 mm2cap S equals the fraction with numerator the square root of 1 comma 000 squared cross 1 end-root and denominator 143 end-fraction equals 6.99 mm squared You would round up to the nearest standard size, such as a cable. 3. Common Earth Cable Sizes by Application how to calculate Earthing conductor size This is where the becomes an indispensable tool
