The client, Mr. Ashworth, wanted a 7.4 kW car charger, a mini workshop, and LED spotlights. “Just wire it in,” he’d said. “My mate Dave says 2.5mm cable is fine.”
The big red book sat on the dashboard. Not a manual. A lifeline. BS 7671 isn’t red tape. It’s the difference between a switch that works and a funeral you pay for. cable calculations bs7671
Tom snorted. Dave wasn’t here. Dave didn’t have to sign the Electrical Installation Certificate. Dave wouldn’t get sued if the cable melted and burned the house down. The client, Mr
Tom sat in his van at 6 a.m., rain hammering the roof. On the passenger seat lay the BS 7671:2018+A2:2022 – the big red book. The Wiring Regulations. His Bible and his courtroom judge. “My mate Dave says 2
At 9 a.m., he knocked on Ashworth’s door. “What’s the damage?” the client asked. “More than Dave’s quote,” Tom said, showing the scribbled page of calculations. “But Dave’s house hasn’t burned down yet. That’s just luck, not engineering.”
Ashworth looked at the dense figures: Ib ≤ In ≤ Iz , the volt drop, the adiabatic. He signed the order.