Unit 38 Written Mock Exam

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1) What are all the steps of safe isolation? (5 marks)

2) What should be included in a risk assessment? (5 marks)

3) Explain the purpose of carrying out the following live tests:

i) External fault loop impedance (2 marks)

ii) Earth fault loop impedance (2 marks)

iii) Prospective fault current (2 marks)

iv) RCD tests (2 marks)

4) If an installation has a bathroom with a socket placed 3.5m away from the bath is this permissible? (2 marks)

5) In a bathroom installation what is the minimum degree of ingress protection for equipment in zone 2 if water jets are not used? (1 mark)

6) A 5m length of conduit needs to be installed through 2 bends and will contain 2 ring circuits of 2.5mm² csa. What is the minimum size conduit you can use? (4 marks)

7) Sketch the earth fault path for a TNCS system. (5 marks)

8) If a cable is to be installed in a wall or partition but run within the acceptable "zones" what is the maximum distance from the top of the wall may it be installed? (1 mark)

9) Describe fully the three ways that PFC may be ascertained for a premises. (6 marks)