Earthing & Lightning Protection
Earthing gives fault current a safe path to ground and holds equipment at a safe touch voltage; lightning protection intercepts a direct strike and routes it to earth before it reaches the structure. NLS Power sources earthing electrodes, conductors and surge protection devices to IEC 62305 and IEC 60364-5-54, sized to a project's soil resistivity and risk level.
Earthing and lightning protection get specified together because they share hardware, ground rods, mesh, test pits, but they solve two different problems. An earthing system gives fault current somewhere safe to go so a protection device can detect and clear it, and it keeps every earthed metal part in a building at close to the same potential, which is what actually protects a person from a dangerous touch voltage during a fault, not the wire itself. A lightning protection system intercepts a direct strike at an air terminal, carries that enormous but very brief current down a dedicated conductor, and dissipates it into the earth before it can pass through the building structure or its electrical wiring.
Earthing system design starts with a soil resistivity test, because a rod or mesh in high-resistivity sandy soil, common across much of Saudi Arabia, needs a larger electrode area or a deeper installation to hit the same earth resistance value a smaller system would achieve in better ground. Target resistance values are set by the equipment being protected: substations and sensitive electronic equipment areas typically call for below 1 ohm, while general building earthing is commonly specified at 5 to 10 ohms, though the applicable local code or client specification governs the actual figure for a given project.
Lightning protection design follows a risk assessment under IEC 62305-2, which weighs the structure's height, occupancy, contents and location to set a protection level (I through IV) and from that the spacing of air terminals and down conductors. Surge protection devices (SPDs) to IEC 61643-11 are the part of the system that lives inside the distribution board rather than on the roof: Type 1 SPDs handle a direct or near strike's residual energy at the main incoming board, Type 2 protect sub-boards further downstream, and Type 3 protect sensitive equipment right at the point of use, each stage reducing the surge voltage a level further before it reaches equipment that can't tolerate it.
NLS Power sources earthing electrodes (rods, plates, mesh), bonding conductors, test pits, and SPDs to IEC 62305 and IEC 60364-5-54, sized from the soil resistivity test and the structure's lightning risk assessment. Quoting works from the earthing study results and the SPD type/coordination the design specifies; NLS Power returns pricing in USD once those inputs are confirmed.
Specifications
- ✓Lightning protection risk assessment and system design per IEC 62305 (parts 1-4)
- ✓Earthing installation reference: IEC 60364-5-54
- ✓Surge protection devices (SPD) to IEC 61643-11, coordinated Type 1 (main board), Type 2 (sub-board), Type 3 (point of use)
- ✓Earth electrodes: copper-bonded or galvanized steel rods, plates, and mesh, sized from a soil resistivity test
- ✓Target earth resistance set by application: under 1 ohm for substations/sensitive equipment, 5-10 ohms typical for general building earthing
- ✓Protection levels I-IV under IEC 62305-2 set air terminal and down conductor spacing
Frequently Asked Questions
What's the difference between earthing and lightning protection?+
Earthing gives fault current a safe path so protection devices can detect and clear it, and keeps touch voltage safe during normal faults. Lightning protection intercepts a direct strike at the roof and routes that separate, much larger surge to earth before it enters the building.
Why does soil resistivity matter for earthing design in Saudi Arabia?+
Much of the country sits on high-resistivity sandy soil, which means a standard rod or mesh system that works fine elsewhere may not reach the target earth resistance here without a larger electrode area or deeper installation. A soil test at the start avoids resizing the system after a failed test result.
Who supplies surge protection devices for distribution boards in Saudi Arabia?+
NLS Power sources Type 1, 2 and 3 SPDs to IEC 61643-11, coordinated across the main board, sub-boards and point-of-use equipment based on the project's lightning risk assessment.