ECS Electrical Wiring and Cable Management

Question 1

What is the minimum bending radius typically required for PVC-insulated cables to prevent damage to the insulation?

Accepted Answer

6 times the overall cable diameter

Answer

3 times the overall cable diameter

Answer

10 times the overall cable diameter

Answer

1 times the overall cable diameter

Question 2

Which cable color is used for the line (live) conductor in a single-phase fixed wiring installation in the US?

Accepted Answer

Brown or Black

Answer

Blue

Answer

Green/Yellow

Answer

Black

Question 3

When installing cables in a wall, what is the primary reason for using a cable detection tool before drilling?

Accepted Answer

To locate hidden electrical cables and avoid electrocution

Answer

To measure wall thickness

Answer

To check for damp

Answer

To find wall studs

Question 4

What does the term 'derating' mean when applied to cables?

Accepted Answer

Reducing the current-carrying capacity due to environmental conditions

Answer

Increasing the cable's rated voltage

Answer

Upgrading the cable insulation type

Answer

Applying a protective coating to cables

Question 5

Which of the following is an acceptable method for supporting horizontal cable runs in a commercial installation?

Accepted Answer

Cable tray with appropriate supports at specified intervals

Answer

Resting on suspended ceiling tiles

Answer

Taping cables to existing pipework

Answer

Draping cables over ceiling joists without fixings

Question 6

What is the purpose of cable segregation in an electrical installation?

Accepted Answer

To prevent interference between different circuit types and reduce fire risk

Answer

To make the installation look neater

Answer

To reduce the amount of conduit needed

Answer

To increase the speed of installation