90°C Cable on 70°C Terminals: Why XLPE Is Sized at 70°C
6 July 2026
The cable is rated 90°C but the switchgear terminals aren't — why BS 7671 Reg 512.1.5 usually forces XLPE onto the 70°C values, and when the full rating can be used.
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Practical guides on electrical design, earthing studies and UK standards — written for contractors and project engineers.
Cable Cleat Spacing & Short-Circuit Forces (IEC 61914)
6 July 2026
Why the habitual 300 mm cleat spacing is often wrong: the physics of short-circuit forces, what IEC 61914 requires, and what actually sets the spacing.
Read the guideHow Much Does an Earthing Study Cost in the UK?
6 July 2026
Honest, indicative 2026 price ranges for earthing studies, cable calculation packs and DIALux lighting design — and what drives a project up or down the range.
Read the guideWhat Is Earth Potential Rise (EPR)? A Practical Guide
6 July 2026
What earth potential rise is, when an EPR assessment is needed, and how touch and step voltage limits under BS EN 50522 and ENA TS 41-24 are checked.
Read the guideCable Sizing to BS 7671: Spreadsheets vs ProDesign
6 July 2026
The five checks in a compliant cable calculation, where spreadsheets go wrong, and what Trimble ProDesign (formerly Amtech) automates.
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