BS7671 Paper 3

Which is included in the scope of the BS7671?

• Systems for the distribution of electricity to the public

• Prosumers low voltage electrical installations

• Equipment of fixed offshore installations

• Equipment of motor vehicles

Which is excluded from the scope of the BS7671?

• Prefabricated buildings

• Maintenance gangways

• Highway street furniture

• Lightning protection systems

BS7671 sets out the technical requirements to enable electrical installations to conform with the

• Fundamental principles of chapter 1

• Fundamental principles of chapter 13

• Electricity, safety, quality and continuity regulations

• Requirements of the health and safety at work regulations

Which is not a method of providing fault protection?

• Preventing current from passing through a body

• Limiting the current that passes through a body

• Preventing the reduction in resistance of a body

• Limiting the duration of current through a body

Which describes the opening operation of a switching device intended to remove electric power from an installation to avert or alleviate a hazardous situation?

• Emergency switching off

• Emergency shutting down

• Emergency switching

• Emergency stopping

A non-stationary unit containing equipment for demonstration purposes is defined as

• A – A stand

• B – A show

• C – A booth

• D – A caravan

Which is a requirement where an installation contains a number of final circuits?

• A – Each circuit is connected to a separate protective device

• B – Each protective device must be of the same type and rating

• C – Every device must have a different rated current

• D – Every device must have a different prospective fault current rating

The following image shows a 2 phase 3 wire supply which has a phase angle of?

• A – 0 degrees

• B – 90 degrees

• C – 120 degrees

• D – 180 degrees

Which would not be considered when determining the compatibility of equipment characteristics?

• A – Unbalanced loads

• B – Starting currents

• C – Power Factor

• D – AC Feedback

Who needs to be consulted when assessing the maintainability requirements of an electrical installation?