Electrical Apparatus, Accessories, Lighting and Equipment
This domain tests practical installation knowledge: switches, socket outlets, lighting, appliances, and their ratings and ingress protection. Candidates must understand IP ratings (first digit dust, second digit water), appliance classes (Class I earthed, Class II double insulated, Class III safety extra-low voltage), and switch types (one-way, two-way, intermediate, and multi-pole).
Socket outlet selection depends on circuit design and location: single or double, switched or unswitched, with or without USB, weatherproof for outdoor use, and RCD protection where required. Understand that socket outlets in domestic and similar installations generally require 30 mA RCD protection under AS/NZS 3000. Lighting circuits require correct control: one-way, two-way for stairs, and dimming compatibility (leading or trailing edge, and lamp type).
Traps include: confusing IPX4 (splashing) with IPX7 (immersion); assuming a double-insulated appliance needs an earth; wiring a two-way switch incorrectly (the common terminal is the trap); and mixing dimmer and lamp technologies that are not compatible, causing flicker or failure.
Worked rule of thumb: for a bathroom or outdoor circuit, check IP rating, RCD, and earthing before wiring. A shower area typically needs a higher IP and RCD protection; an outdoor socket needs a weatherproof enclosure and RCD.
Also know that accessories must be installed according to manufacturer instructions and the Wiring Rules, and that alterations to existing circuits require verification of the existing protection.