QUESTION 1
(a)   Describe FOUR methods of preventing the collapse of a trench.
1
 
2

3

4

(2 marks)

(b)   State TWO precautions which should be taken to ensure members of the public do not fall
into an excavated trench at night-time.
1

2

(1 mark)

(c)   Water supply installations may require earth (equipotential) bonding to be provided.
Give THREE situations where this is required.
1
 
2

3


(3 marks)
Total 6 marks


Linkback: https://forum.plumbers.nz/plumbing-exam-june-2007/23/question-1/163/