Energy Sector Environment

Question 1

List the different components of the overhead mains supply.

Answer 1

Question 2

List the different components of the underground mains supply.

Answer 2

Question 3

What is the minimum distance aerial cables are installed above ground.

Answer 3

3 meters

Question 4

Where does the main supply entering a premises terminate at ?

Answer 4

Main switchboard

Question 5

List 4 different types of switchboards.

Answer 5

main switchboards
distribution boards
meter panels
control panels

Question 6

List the following parts of a domestic switchboard.

Answer 6

Question 7

What is the purpose of a switchboard ?

Answer 7

• To provide a point at which the installation can be controlled, protected, and divided up into different circuits.

Question 8

List 5 different types of circuits used to supply different types of equipment.

Answer 8

socket-outlets circuits
lighting circuits
air conditioning circuits
motor control circuits
electric heating circuits

Question 9

List 4 types of equipment housed in switchboards.

Answer 9

protection devices
switchgear and control gear
metering equipment
bars, links and terminals

Question 10

When are switchrooms used ?

Answer 10

When installation requires several switchboards.

Question 11

Name 5 equipments housed in switchroom.

Answer 11

main switchboard
distribution boards
fault limiters
switching and control equipment
metering equipment

Question 12

What is the purpose of rising mains ?

Answer 12

• Rising mains (risers/rising busbars) are vertical electrical distribution systems used to efficiently transport electrical power from a building’s main distribution point to various floors.

Question 13

Name the following parts of the distribution board.

Answer 13