Practical electrical design articles: earthing, protection, cables, SPDs, generators, boards and drawings.
Ten checks for installing EV chargers, from supply capacity and load management to RCD type, open-PEN protection, cable sizing and commissioning tests.
EV Charger Installation: An Electrical Checklist Read More »
Why PV DC circuits need their own protection rules, and a worked 4-string example covering maximum voltage, string fuses, SPD, isolator and RCD type.
PV Systems: DC Isolation, Fuses and Earthing Basics Read More »
A quick UPS sizing method that checks kVA, kW and battery autonomy separately, with a 40 kW, 10-minute example and the rules of thumb behind it.
UPS Sizing: kVA, kW and Battery Autonomy in Practice Read More »
Choose cable glands from the cable’s real diameters, not its mm² size: sealing ranges, threads, IP, armour termination and earthing, materials and site tips.
Cable Gland Selection: Size, Armour, IP and Earthing Read More »
How to place air terminations with the rolling sphere and mesh methods, calculate the sphere sag between rods and the separation distance, with a rooftop example.
Lightning Protection Basics: Rolling Sphere and Mesh Method Read More »
EN 1838 / EN 50172 and NFPA 101 emergency lighting values side by side, what the difference means on a project, and where every luminaire must go.
Emergency Lighting: Quick Design Rules (EN 1838 / NFPA 101) Read More »
Starting current and torque of DOL, star-delta, soft starter and VFD side by side, a 30 kW pump example and six questions that pick the right starter.
Motor Starting: DOL, Star-Delta, Soft Starter or VFD Read More »
When busbar trunking beats parallel cables, the six checks that size it, and a 40 m riser example showing why distributed loads halve the voltage drop.
Busbar Trunking vs Cables: Selection in Practice Read More »
Why long SPD leads destroy the protection level, and the nine steps to wire a Type 2 SPD correctly: lead length, cross-section, back-up device and earth path.
How to Connect an SPD in a Distribution Board (the 0.5 m Rule) Read More »
The ten mistakes reviewers find most often on SLDs, each with why it is wrong and the fix, plus a checklist of the data every board and feeder should show.
10 Common Mistakes on Single-Line Diagrams Read More »