Unit 6 testing quiz

To which one of the following situations does BS 7671 apply?

• The manufacture of electrical equipment

• The inspection and testing of the electrical installation on an oil rig

• The design of an electrical installation for a caravan site

• The public electricity supply system

Which one of the following is listed under exclusions from the scope of BS 7671?

• Saunas

• Swimming pools

• Marinas

• Lightning protection

BS 7671 defines low voltage a.c. between conductors as voltage:

• Below 250 V a.c

• Below 1000 V a.c. but above 50 V a.c.

• Above 50 V a.c. but below 500 V a.c.

• Above 250 V a.c. but below 1000 V a.c.

An ordinary person is a person who:

• Is skilled at electrical work

• Works in electrical maintenance

• Is neither skilled nor instructed

• Is at least 18 years old

A 12 V fire alarm circuit is classified by BS 7671 as:

• A Band I circuit

• A Band II circuit

• A Band III circuit

• An unclassified circuit

Which one of the following is NOT a classification of external influence?

• Current rating

• Environmental conditions

• Construction of buildings

• Utilisation

Non-sheathed cables for fixed wiring, other than protective conductors, should always be installed in:

• Dry conditions

• Trenches

• Conduit or trunking

• Sub-zero temperatures

Domestic ring final circuits are used to supply BS 1363 socket outlets. If the floor area to be served is limited to 50 m², the cable feeding the circuit must be:

• 4 mm²

• 2.5 mm²

• 1.5 mm²

• 6 mm²

A domestic final ring circuit may:

• Supply any number of socket-outlets over an area of 200 m²

• Feed an immersion heater

• Require additional protection by an RCD

• Supply a cooker rated at 2.5 kW

Where thermoplastic insulated and sheathed cables are installed in a plastered wall at a depth of 45mm and are not protected against mechanical damage, they must be:

• Protected by BS60898

• Protected by a 30 mA RCD

• Protected by a 50 mA RCD

• Protected by a 100 mA RCD