GMJ 9189 phase 3 UNIT 312 ws 2

What are the typical voltages present in the following situations?

a)    In a single-phase supply between live and neutral:

• 110v

• 230v

• 400v

• 1000v

1.    What are the typical voltages present in the following situations?

b)    In a single-phase supply between live and earth:

• 110v

• 230v

• 400v

• 1000v

What are the typical voltages present in the following situations?

c)    In a three-phase supply between L1 and earth:

• 110v

• 230v

• 400v

• 1000v

What are the typical voltages present in the following situations?

d)    In a single-phase supply between L1 and L2:

• 110v

• 230v

• 400v

• 1000v

List the three typical earthing system arrangements found in a dwelling.

• TT

• TN-S

• TN-F-R

• TN-C-S

The image shows a typical generation process. What voltages are present at points A and B?

 

• A: 22,000V AC

• B: 275,000V or 400,000V AC

• A: 22,000V DC

• B: 275,000V or 400,000V DC

Identify the components shown in the image.

• Suppliers 100A main fuse

• Main Earth Bar (MET)

• MCB

• ECB

Identify the components shown in the images.

• Main Earth Connection

• Meter Tails

• Main cable to the Combi boiler

Describe the purpose of the protective conductor.

 

• providing a zero-volt path for any potential fault current to flow to live

• providing a zero-volt path for any potential fault current to flow to earth

• providing a zero-volt path for any potential fault current to flow to neutral

 

What is the correct size of the main protective conductor within a TN-C-S system?

• 6mm²

• 10mm²

• 12mm²

• 16mm²