Which type of electrical installation is included in the scope of BS7671?

• Equipment in fixed offshore installations

• Railway signalling equipment

• Installations in fairground booths

• Equipment on aircraft

What electrical installation is excluded from the scope of BS 7671?

• Mobile offshore installations

• Extra-low voltage lighting

• Onshore units for the connection of navigation vessels.

• Equipment installed in operating and maintenance gangways

What is listed as a fundamental principle of basic protection?

• Preventing voltage from passing through the body

• Limiting the magnitude of voltage resulting from a fault

• Limiting the current that can pass through the body to non-hazardous value

• Limiting the duration of a current from a fault

Which cable support system is defined as a support consisting of transverse supporting elements rigidly fixed to main longitudinal supporting members?

• Cable tray

• Cable channel

• Cable ladder

• Cable cleats

What is a bypass bonding conductor defined as being in parallel to?

• Screens of cables

• Armours of cables

• Cores of cables

• Groups of cables

What may be taken into account when assessing the maximum demand as part of the general characteristics of a supply?

• Discrimination

• Selectivity

• Overvoltage

• Diversity

Which is a stated reason for the division of an installation into circuits?

• Reduce over current flow in the installation

• Reduce the possibility of unwanted tripping RCD’s

• Reduce the amount of cable used throughout the installation

• Reduce the number of protective devices needed to achieve ADS

Which system of earthing utilizes a PEN conductor as part of the arrangement?

• TT

• TN-C-S

• TN-S

• IT

What characteristics of equipment should be assessed for harmful effects when considering compatibility?

• Starting currents

• Electromagnetism

• Low frequencies

• Fault currents

Which of the following not a fundamental principle relation to the characteristics of an available supply?

• Nominal voltage

• Rotation of phases

• Prospective fault current

• Maximum current allowable