Few candidates were able to state functional requirements of inspection chamber in a drainage scheme.
However, majority of the candidates were unable to:
- state the advantages of the direct cold water supply system over the indirect cold water supply system.
- describe the metal conduit wiring system in electrical installation works.
The expected response to question 5 is a given below:
5. (a) The functional requirements of an inspection chamber are:
- Means of access for inspection and cleansing;
- Provide access for testing the drain line;
- Materials used for the construction must be sound and inert;
- Must be air tight and water tight;
- The size of the chamber must permit ready access.
(b) Advantages of the direct cold water supply over the indirect cold water supply system are:
- Few pipes required for installation;
- Water available at every point;
- Water from tap is cool;
- Water is not contaminated by dangerous elements;
- Water pressure is good most of the time;
- No cistern or storage tank required.
- Description of metal conduit wiring system in an electrical installation work;
The metal conduit pipes are buried in floors and the electrical wires are passed through them. Accessories such as bends and coupling are used to facilitate connections to fittings, appliances and power points. Also the metal pipes are used as earthing conductors.
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