Most candidates did well in this question. They were able to:
- state the methods used in domestic electrical wiring;
- list the standard colour codes for the given electrical wires;
- state the purposes for applying paints to a wall surface;
- sketch the given wall finishes.
The expected response to question 5 is as given below:
(a) Two basic methods used in domestic electrical wiring include:
- surface wiring (pvc sheathing)
- conduit wiring (metal or pvc tube)
- surface trunking
(b) Standard colour codes
(i) red or brown - live
(ii) black o blue - neutral
(iii) green or yellow-green-earth
(c) Purposes of applying paint to a wall surface are:
- improve the appearance of structure underneath
- to preserve the surface
- Hygienic purposes.
