BS7671 Part 3

The type of building construction in which an installation is to be carried out may affect the design and safe operation of the installation. This effect is called:

• a) the nature of the supply

• b) compatibility

• c) maintainability

• d) an external influence

In addition to regular maintenance of an installation, which one of the following is NOT an essential requirement?

• a) periodic inspection and testing may be readily and safely carried out

• b) the name and address of the contractor is permanently displayed adjacent to the mains

• c) the reliability of the equipment is sustained

• d) protective measures for safety remain effective

The three general categories of external influence are environment, utilisation and:

• a) the number and type of live conductors

• b) construction building

• c) method of installation

• d) the installation earthing arrangements

With reference to the general characteristics of an electrical installation, the maximum demand should be:

• a) determined by the supply company

• b) calculated from the installation drawings

• c) obtained from the architect

• d) assessed and diversity may be taken into account

Which one of the following statements is a requirement of BS 7671:2018?

• a) consideration should be given to the need to carry out periodic inspection during the life of the installation

• b) all fixed installations must be in accordance with the relevant EMC regulations

• c) electromagnetic interference is not considered when planning and designing an installation

• d) storage batteries may be used as a source of electrical energy for a safety service

The external influence having a classification of AD8 would indicate a condition of:

• a) submersion in water

• b) immersion in water

• c) dust in the atmosphere

• d) high levels of vibration

Where a wiring system is installed in a building whose structure has an external influence category CB4, the wiring system shall be:

• a) rigid

• b) flexible

• c) screened

• d) armoured

The Classification code for high wind is:

• a) AS3

• b) AR3

• c) AP3

• d) AN3

An external influence categorised as AG1 applies to a:

• a) quarry

• b) factory

• c) house

• d) workshop

When considering continuity of service to life support systems, which one of the following should be considered?

• a) the number of persons in the building

• b) selection of protective device to achieve discrimination

• c) the type of cable to be used

• d) the fixing height of switches and sockets