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QUESTION 10
(a) When installing an underground stormwater drain, a drainlayer must ensure that there is
separation between the drain and any electrical earthing electrode for an electrical supply.
(i) State the minimum distance between a stormwater drain and a earthing electrode
for an electrical supply not exceeding 1000V.
(ii) When laying a drain which will be in close proximity to an electrical supply exceeding
1000V, state what the drainlayer must do prior to laying the stormwater drain.
(2 marks)
(b) When any underground stormwater drain is to cross another service, certain restrictions
apply.
(i) State the minimum vertical separation between the drain and the other service.
(ii) State the minimum angle at which the drain and the other service must cross.
(iii) The stormwater drain shall be installed with a clearance of at least 300mm from any
underground obstruction. Give TWO reasons for this clearance.
1
2
(iv) When crossing another service, marker tape must be laid 150mm above the installed
service.
State where this marker tape is to be positioned, and the location and distance it is to
be laid.
Position:
Location and distance:
(6 marks)
Total 8 marks
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Question 10.
a1) 500mm
a2) The relevent regulatory authority shall be contacted for a ruling.
2a) 100mm
2b) not less then 45 deg.
2c) 1) To protect the drain form physical damage
2) To permit repairs
2d)