Observation

The expected answers were;

Regulations guiding listed parameters with respect to installation of earthing

1. Distance: the distance of the earth electrode from the installation at the premises should not be more than 1.5m.           
2. Cross-section of the earth continuity conductor: the size of the earth continuity conductor used in the circuit should not be less than (2.5mm2 – 4.0 mm2) copper wire.
3. Cross-section of the earth wire: the cross-section of the earth used in the circuit should not be less than half of the cross-section of the main wire of the conductor. The minimum size of the earth wire should be (10 mm2 - 16mm2) copper wire.
4. Electrode: the earth electrode and earth wire should be of same material and the electrode should always be buried in the vertical position.
5. Earth resistance: the earth resistance of any earthing should be less than1 ohm for better performance.

                                                                     
Many candidates who attempted this question performed poorly. This question is a recall of the regulation on the parameters which is outside the classroom.