Part P Cable Selection and Wiring Systems

Question 1

What type of cable is most commonly used for fixed domestic wiring circuits in the UK?

Accepted Answer

Twin and Earth (T&E) flat cable

Answer

Steel Wire Armoured (SWA) cable

Answer

Mineral Insulated Copper Clad (MICC) cable

Answer

Flexible cord (flex)

Question 2

What does the abbreviation 'T&E' stand for in UK electrical cable terminology?

Accepted Answer

Twin and Earth

Answer

Tested and Earthed

Answer

Triple and Earthed

Answer

Terminated and Earthed

Question 3

Following the 2004 harmonisation with European cable colour standards, what colour is the line conductor in UK fixed wiring?

Accepted Answer

Brown

Answer

Red

Answer

Blue

Answer

Black

Question 4

What colour is the standard outer sheath of twin and earth cable used in UK domestic fixed wiring?

Accepted Answer

Grey

Answer

White

Answer

Black

Answer

Yellow

Question 5

What is the minimum cross-sectional area (CSA) of the line and neutral conductors in a standard 32A domestic ring final circuit?

Accepted Answer

2.5 mm²

Answer

1.0 mm²

Answer

1.5 mm²

Answer

4.0 mm²

Question 6

What is the primary purpose of the Circuit Protective Conductor (CPC) within a twin and earth cable?

Accepted Answer

To provide a low-impedance fault path so protective devices can operate quickly

Answer

To carry the neutral return current under normal load

Answer

To carry additional line current during heavy load

Answer

To screen the cable from electromagnetic interference

Question 7

Where a bare CPC is exposed at a termination point, how must it be identified according to BS 7671?

Accepted Answer

With green and yellow sleeving

Answer

With solid green sleeving

Answer

With brown sleeving

Answer

With blue sleeving