Cork Institute of Technology
Bachelor of Engineering in Building Services Engineering -
Award
(NFQ Level 7)
Summer 2007
Building Services Facilities Electrical – Paper 1
(Time: 3 Hours)
Instructions
Answer FIVE questions.
Examiners: Mr. S. Boljevic
Mr. D. Leonard
Dr. M. Smyth
Q1. (a) Relative to the fire alarm system, explain the following:
(i) P1; L1; L2 – types of fire alarm system.
(ii) Outline and explain consideration that shall be taken into account during the zoning
of a building. (10 marks)
(b) Relative to the security alarm system, with aid of a neat sketch, explain the operation of:
(i) Passive infrared detector
(ii) Tamper circuit (10 marks)
Q2. (a) With aid of a neat sketch, explain lightning discharge. (6 marks)
(b) A nursing home is located in West Cork close to similar types of building in wooded
area.
Building is constructed of brick wall and slate roof.
Dimensions of the building are:
L = 30m; W = 20m; H = 15m
Ng obtained for theWest Cork area from the map is 0.22
Determine overall risk factor for the building to be struck by lightning, expressing it in
reciprocal form. (14 marks)
(For additional information use Appendix 1)
Q3. Relative to the lightning protection with aid of a neat sketch, explain the following:
(a) Step and touch voltage (5 marks)
(b) Side flashing (5 marks)
(c) Resistive coupling (5 marks)
