House Wiring Basics

Starter · about 5 hours · 18 lessons and builds · for homeowners, electricians starting out, nc-ii reviewers

Wire lights, switches, outlets and a panel the way the Philippine Electrical Code expects, size the breaker and the wire for each circuit, and know what an RCD does.

Switches, outlets, the panel, breakers and wire sizes, RCDs, aircon and heater circuits, all on 230 V.

Before you start: Ohm’s law

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Module 1: 1 · Current, power and what a wire can carry

• Ohm’s law
• Power and power ratings
• Fuses and fault current

Extra practice:

• Using a multimeter

Module 2: 2 · Lights and switches

• Light with one switch
• Staircase light: two 3-way switches

Extra practice:

• Fan and light on a 2-gang switch

Module 3: 3 · Outlets and the branch circuit

• Outlet circuit: three outlets on a 20 A breaker

Extra practice:

• Inrush limiting with an NTC

Module 4: 4 · The panel: main breaker and branch circuits

• House panel: main breaker and four branch circuits

Module 5: 5 · Big loads: aircon and water heater

• Aircon branch circuit: 1.5 HP on 3.5 mm² and a 20 A breaker, on its own
• Water heater circuit: 3.5 kW on 5.5 mm² and a 30 A breaker

Extra practice:

• Why a 1.5 HP non-inverter aircon trips a 3 kW inverter at start-up

Module 6: 6 · People and faults: the RCD

• RCD protection: someone touches a live wire

Extra practice:

• Opto-isolated mains switching (zero-cross SSR)

Module 7: 7 · Transformers and three-phase, briefly

• Basic transformer

Extra practice:

• Three-phase star (Y)
• Three-phase delta (Δ)