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// FREE MINI-COURSE · 230V

Home Electrical

Home Wiring, Explained — Find faults, save power and stay safe with the wiring in your own home.

8 of 9 lessons out · next: Net metering: when your meter runs backwards

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  1. 01 Find a hidden current leak with a clamp meterUse a clamp meter on the main phase, MCB by MCB and switch by switch, to find the exact wire that leaks current (and wastes units). EP.25 · 20 s
  2. 02 Red, black, green: the 3 wires in your homeFollow power from the plant (400 kV) down to 230 V: the transformer's star point makes the neutral, red phase pushes, black neutral returns, green earth saves you in a fault. EP.26 · 20 s
  3. 03 RCCB: the switch that trips on a leakHow an RCCB compares phase and neutral current and cuts the power by itself when 30 mA leaks to earth. EP.40 · 24 s
  4. 04 MCB: overload vs short circuitThe two trip parts inside an MCB (bimetal for overload, magnetic coil for a short) and how to pick 6 A / 16 A / 32 A. EP.41 · 24 s
  5. 05 Earthing: how an earth pit worksWhat is inside an earth pit, why its resistance must be low, and how to test earthing safely. EP.46 · 24 s
  6. 06 What is 1 unit of electricity? (kWh)1 unit = 1 kWh = 1000 W for 1 hour; hours per unit = 1000 ÷ watts (LED 100 h, geyser 30 min) and how to estimate a monthly bill. EP.47 · 24 s
  7. 07 Inverter backup: how long will your battery last?Battery energy = volts × amp-hours (12 V × 150 Ah = 1800 Wh), divide by the load in watts (and inverter losses) to estimate backup hours. EP.50 · 24 s
  8. 08 Solar panels: how many does your home need?Panel watts × sun hours = daily energy (a 540 W panel × ~4.5 h ≈ 2.4 units/day) and how to size panels from your monthly units. EP.53 · 24 s