ECS - Electrotechnical Certification Scheme Electrical Regulations and Standards Questions and Answers

Question 1

Which of the following UK regulations is statutory and legally binding, imposing duties on employers and employees to prevent danger from electricity in all work activities?

Accepted Answer

The Electricity at Work Regulations 1989

Answer

BS 7671 (IET Wiring Regulations)

Answer

The On-Site Guide

Answer

IET Guidance Note 3: Inspection & Testing

Question 2

An electrician is installing a new circuit in a domestic kitchen in England. Under which part of the Building Regulations must this 'notifiable' work be certified to ensure electrical safety?

Accepted Answer

Part P (Electrical Safety - Dwellings)

Answer

Part B (Fire Safety)

Answer

Part M (Access to and use of buildings)

Answer

Part L (Conservation of fuel and power)

Question 3

According to BS 7671, what is the primary purpose of main protective bonding?

Accepted Answer

To connect extraneous-conductive-parts to the Main Earthen Terminal (MET).

Answer

To connect all Class II equipment to the Main Earthen Terminal (MET).

Answer

To limit the touch voltage on exposed-conductive-parts during an earth fault.

Answer

To provide a direct path for lightning strikes to dissipate into the ground.

Question 4

An electrician is working on an installation supplied by a TN-C-S (PME) system. What is the minimum permitted cross-sectional area for a main protective bonding conductor made of copper?

Accepted Answer

10 mm²

Answer

6 mm²

Answer

16 mm²

Answer

4 mm²

Question 5

A significant change in the 18th Edition of the IET Wiring Regulations (BS 7671) was the increased emphasis on protection against transient overvoltages. In which situation is the installation of Surge Protection Devices (SPDs) now mandatory?

Accepted Answer

Where the consequence of overvoltage could result in serious injury or loss of human life.

Answer

In all domestic installations without exception.

Answer

Only in industrial installations with heavy machinery.

Answer

For any circuit protected by a residual current device (RCD).

Question 6

Part 7 of BS 7671 details the requirements for 'Special Installations or Locations'. Which of the following locations requires that all circuits must have additional protection by one or more 30mA RCDs?

Accepted Answer

A location containing a bath or shower.

Answer

A commercial office space.

Answer

An IT equipment room with a functional earth.

Answer

A domestic garage used only for storage.