STOP THE MELT:
Why Overloading
Circuits Causes
House Fires
The 13 A socket as the weakest link in any circuit. Continuous load thermal runaway. The "fine for years" myth. What a melted faceplate is actually telling you — and what to do about it.
Inside the Consumer Unit
Components & Protective Devices
Main switch, RCD, MCB, RCBO, SPD and AFDD — each device defined objectively with its BS 7671 role and a summary comparison table.
Preparing for Your Visit
One hub with linkable sheets: installation, EICR, consumer unit upgrade, fault finding, EV charging, and house rewire. Each includes health and safety, PPE, and a scenario-specific “what to expect” — ideal to send after a client books in.
Open appointment guidesEmergency Safe Isolation Guide
Step-by-step circuit isolation. Medical equipment, vulnerable persons and data — what to consider before switching off.
Read guideBS 7671 Amendment 4 (2026)
Chapter 82 prosumer installations, power quality, battery storage and what changed for domestic installers in 2026.
Read technical breakdownAdvanced Fire & Surge Protection: The Amendment 4 Standard
How AFDDs detect arcing before fuses respond; SPD coordination; 2026 requirements for high-risk settings and older Thanet homes.
Read guideFree Tools for Electricians
Expected Test Results Calculator
Enter whatever you’ve already got — Zs, Ze, R1, R2, R1+R2, Line-Line, Neutral-Neutral, Earth-Earth or cable length, for a ring final or radial circuit — and it fills in every other expected value. Built to BS 7671 20°C copper resistivity values, for T&E and singles.
Open the calculatorOhm’s Law & Power
Any two of voltage, current, resistance or watts. Single-phase and three-phase kilowatts, kVA and kvar.
Open calculator CalculatorSeries & Parallel Resistors
Add or remove as many resistors as you need. Series, parallel, or series strings in parallel branches.
Open calculator CalculatorVoltage Drop
Current, length and conductor size for copper or aluminium, checked against 3% or 5%.
Open calculator CalculatorAdiabatic CPC Size
Minimum protective conductor from fault current, disconnection time and k.
Open calculator CalculatorPower Factor
kVA, kvar and the capacitor size to raise the power factor on a single-phase or three-phase load.
Open calculator All toolsColour Code, Energy, Transformer
Resistor bands, running cost, ideal transformer ratio and the LED savings calculator, all on the tools page.
Browse all toolsModern Safety Upgrades
Arc Fault Detection Devices (AFDDs)
Fire risk from series arcing versus shock protection from RCDs. Amendment 4 requirements and relevance for older Thanet properties.
Read guideSurge Protection Devices (SPDs)
Transient overvoltage protection for sensitive electronics. Amendment 4 makes documented risk assessment mandatory on board upgrades.
Read guideEV Home Charging (Amendment 4)
PME vs TT earthing, O-PEN detection, CT-clamp load management, bidirectional readiness and RCD type selection for wallboxes.
Read guideEV Charging & Earthing Regulations
Safe EV Charging: Earthing, Load-Shedding & The Grid
PME earthing risks explained. O-PEN protection options. Mandatory CT-clamp load management under Amendment 4 to protect the main house fuse.
Read guideComplete EV Series
Three linked guides on domestic EV supply
From earthing fundamentals to Amendment 4 load management and surge protection coordination — the complete reference for any domestic charge point installation.
Product Selection Guides
LED Selection Guide
2700K vs 4000K, wattage and dimmer compatibility explained.
Read guide → Product SelectionSmoke Alarm Buying Guide
Optical vs Heat vs Ionisation — which type for which room.
Read guide → Product SelectionSmart Thermostat Compatibility
Nest vs Hive vs Tado, C-wires and boiler compatibility.
Read guide → Product SelectionUSB Socket Upgrade Guide
Amperage for fast versus standard charging — what to specify.
Read guide →All Guides
Serving the Isle of Thanet
Need a qualified electrician?
Free quotations across Margate, Ramsgate, Broadstairs, Birchington and Westgate-on-Sea. All work certified under BS 7671.
Roy's Corner
Short weekly updates from Roy — jobs, tips, and what's happening in Thanet.