Electrical Installation Quiz

In certain cases, the requirements of BS 7671 need to be supplemented by the requirements or recommendations of other British Standards for certain aspects or parts of the installation. Which of the following is not an example of this:

• Explosive atmospheres

• Telecommunications systems

• Electric fences

• Life safety and firefighting applications

When is it permissible to make an intended departure from a requirement of BS 7671?

• At the request of the client

• Where it is not cost-effective to comply fully with relevant requirements

• Where temporary work is carried out

• Where the resultant degree of safety is not less than would be obtained by compliance

Who is responsible for the design of an electrical installation?

• A skilled person

• An instructed person

• An ordinary person

• A responsible person

Which of the following does not necessarily have to be taken into consideration when determining the cross-sectional area of conductors?

• Energy efficiency

• Method of installation

• Maximum admissible conductor temperature

• Voltage drop

The phrase 'An overcurrent occurring in a circuit which is electrically sound' defines which of the following?

• A short-circuit current

• An earth-fault current

• A prospective fault current

• An overload current

The definition 'Conductive part of equipment which can be touched and which is not normally live, but which can become live under fault conditions' describes which of the following?

• Extraneous-conductive-part

• Exposed-conductive-part

• Live part

• Protective conductor

When considering types of system earthing, what is the meaning of the first letter 'T' in the designation 'TT'?

• All live parts of the installation are isolated from Earth

• There is a direct connection of one point of the system to Earth

• There is a direct electrical connection between exposed-conductive-parts of the installation and Earth that is independent from the earthing of any point of the power system

• The protective function is provided by a conductor separate from the neutral conductor

When considering what frequency and quality of maintenance should be expected for an electrical installation, which of the following does not have to be assured?

• Periodic inspection, testing, maintenance and repairs can be readily and safely carried out

• The effectiveness of the protective measures for safety does not lessen during the intended life of the installation

• The reliability of installed equipment is appropriate to the intended life of the installation

• There is no deterioration of energy efficiency

Which of the following is not a requirement for a final circuit?

• Separate circuits shall be provided for parts of an installation which need to be separately controlled

• The current-carrying capacity of all live conductors of a final circuit shall be equal

• The wiring of each final circuit shall be electrically separate from that of every other final circuit

• Each final circuit shall be connected to a separate way in a distribution board

Which of the following is not a characteristic of the electrical installation that needs to be assessed during the design process?

• Required continuity of service

• Methods of protection for safety

• External influences likely to be present

• Maintainability