Switchgear

Question 1

Show the layout of the following items utilising the box-type switch gear
- main isolator
- main busbar
- single and three phase switches fuses

Answer 1

Main isolator
_____
| |__________________
| | | |
|____|______| __________|
single and three phase

———————- busbar
__________________
| | |
|_________|______|

Question 2

5 advantages of insulated switchgear v metal clad switchgear

Answer 2

Reduced shock risk
Non tracking
Reduced size
Corrosion resistance
No earth between boxes

Question 3

Advantages of copper busbar

Answer 3

Higher conductivity
Higher mechanic strength

Question 4

Disadvantages of copper busbar

Answer 4

Heavier
More expensive

Question 5

3 characteristics to consider when selecting supports for busbar

Answer 5

• Capable of withstanding the electromechanical forces
• Must not compromise insulation resistance between busbars and busbars and earth
• Must accommodate expansion of busbars without stress