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Question 4
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wiring system is to be used for the installation.
- Prepare a key for the layout.
- List the quantities of each of the fittings on the layout.
- Sketch a labelled circuit diagram showing how the lamps in the layout can be controlled independently in parallel.
- (i) Mention the instrument required for carrying out insulation resistance test for the installation.
(ii) State the minimum acceptable value for insulation resistance.
- What is the maximum height specified by IEE regulations for the following electrical devices from finished floor level?
- Switches;
- 13A sockets;
- 15A sockets.
- State two precautions needed for proper electrical installation in the room.
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This is a test of practical question. Majority of the candidates that attempted this question could not correctly interprete the electrical drawing. However, a few candidate did well in answering this question.
The expected answers include:
4 (a)
(b) 15A socket - 1
13A socket - 2
Wall bracket - 2
Ceiling fan - 1
Fan regulator - 1
Two-way switches - 2
(c)
(d) (i) Megger tester/installation resistance tester
(ii) 0.5 megger ohm OR 500,000?
(e) (i) 1200 mm – 1500mm / 120cm – 150cm
(ii) 450mm – 500mm / 45cm – 50cm
(iii) 450mm – 500mm / 45cm – 50cm
(f) - tighten all connector terminal/avoid partial contact;
- tighten all sitting of fittings;
- ensure that fittings are properly connected to the right polarity;
- ensure that fittings are properly aligned to the sittings;
- ensure neatness of finished fittings;
- ensure that conductors are not live before commencing testing;
- ensure that the correct tools are used for the right task;
- avoid naked conductors in the installations;
- ensure good insulation resistance for the installation;
- ensure effective earthing system.
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