Practice Paper 3

Which of the following is not a preferred frequency as outlined in BS7671?

• 40 Hz

• 50 Hz

• 60 Hz

• 400 Hz

Which person makes the recommendation for the interval to the first periodic inspection and testing of an electrical installation?

• The person ordering the work

• The designer

• The installer

• The person carrying out the initial verification

BS 7671 does not apply to electrical installations of?

• Construction sites

• Ships

• Caravans

• Electric vehicle charging points

To which of the following do the requirements of BS 7671 apply?

• Installations in mines

• Offshore installations

• Public Transmission systems

• Caravans and their sites

A system is defined as?

• The kWh meter and an installation

• The distribution cables to an installation

• The consumer's terminals of an installation

• A single source or multiple sources of electrical energy and an installation

120 volts D.C. between conductors is classified as?

• Extra low voltage

• Reduced low voltage

• Low voltage

• Medium voltage

Which of the following is not a general characteristic that needs to be assessed?

• Intended use of the installation

• Likely external influences

• Compatibility of installed electrical equipment

• Energy efficiency

Which of the following supply systems is also known as Protective Multiple Earthing?

• IT

• TN-S

• TN-C-S

• TT

Which one of the following is not recognised as a source for safety services?

• Separate feed

• Storage batteries

• Two distributors supplies taken from the same transformer

• Generator sets independent of the normal supply

When considering the frequency for maintenance of installed electrical equipment during the life of an installation, which of the following is NOT an essential requirement?

• Any periodic inspection and testing may be readily and safely carried out

• Any protective measures for safety remain effective

• The reliability of the equipment is maintained

• The name and address of the contractor carrying out the work is displayed adjacent to the equipment