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Cork Institute of Technology
Higher Certificate in Engineering in Building Services
Engineering – Stage 1
(NFQ — Level 6)
Summer 2006
Industrial Services — Electrical & Electronic Drawing
(Time: 3 Hours)
Answer QUESTION 1 and TWO other questions. Drawings to be completed using AutoCAD ®, one question per file. Save each file in your own folder. Include your name on each file. Save your drawing file every 10 minutes!
Examiners: Dr. N. J. Hewitt Mr. D. Leonard Mr. D. A. Collins Mr. S. Boljevic
Q1. (a) Sketch a circuit diagram showing two resistors connected in parallel, controlled by a switch and connected to a battery supply. [6 marks] (b) Compare the circuit diagram and wiring diagram under the headings of purpose, readership and layout. [6 marks] (c) What is the importance of reference designation in electrical diagrams? [6 marks] (d) Describe the advantages of using the layers feature in AutoCAD®^ drawings. [6 marks] (e) Sketch the graphical symbol for each of the following… (i) a fuse (live end indicated) (ii) an AC motor for use in circuit diagrams [3 marks] (iii) a bell (iv) a dimmer (v) a loudspeaker for use in building plans [3 marks] (vi) a shaver socket
Q2. A small chapel has eight 1,5 kW radiant heaters for occasional heating. Draw a single line diagram in vertical orientation (complete with reference designations, cable details, rated currents/powers and load names) to represent the following electrical circuit arrangements… (a) The incoming single phase supply is delivered by a three core 16 mm^2 copper cable and is controlled by a 63 A fuse switch disconnector and a 63 A contactor. [ marks]
(b) The service then branches into eight outgoing circuits, one for each heater, the details of which are specified in the following table…
Heater Protection Cable Heater 1 10 A MCB Three core 1,5 mm^2 copper cable Heater 2 10 A MCB Three core 1,5 mm^2 copper cable Heater 3 10 A MCB Three core 2,5 mm^2 copper cable Heater 4 10 A MCB Three core 2,5 mm^2 copper cable Heater 5 10 A MCB Three core 1,5 mm^2 copper cable Heater 6 10 A MCB Three core 1,5 mm^2 copper cable Heater 7 10 A MCB Three core 2,5 mm^2 copper cable Heater 8 10 A MCB Three core 2,5 mm^2 copper cable
[20 marks]
Q3. Figure 1 shows the plan of a hot house in a garden centre; the scale is 1:50.
(a) Redraw the plan to the same scale and prepare it for printing on A4 paper in landscape orientation on the local printer. Use hatching within the walls. Record the true interior length and width of the room on your plan. [15 marks] (b) On the plan, place the graphical symbols and reference designations for these items… 8 × 1,5 m twin fluorescent fittings, deployed for uniform lighting of the room; [8 marks] 2 × two-way switches beside each door; [4 marks] 2 × self-contained emergency lighting fittings, deployed for uniform lighting; [ marks] 1 × room thermostat in the centre of the room. [4 marks]
