BS7671 provides requirements for safety against the risk of?
Which one of the following is not a statutory regulation?
BS7671 identifies that the cross-sectional area of a conductor shall by determined by?
A corridor containing supporting structures for cables and joints and/or other elements of wiring systems, the dimensions of which allow persons to pass freely throughout the entire length, is known as?
The algebraic sum of the currents in the live conductors of a circuit at a point in the electrical installation is known as?
The current-carrying conductor arrangement shown in the figure above is
With reference to the nature of the supply, which one of the following can be determined by calculation, enquiry or measurement?
Every installation should be divided into individual circuits to?
Diversity may be taken into account when considering?
Which one of the following is not a characteristic of the supply?
BS7671 requires designers to take into account the frequency and quality of maintenance an installation can reasonably be expected to receive when?
Which one of the following is not part of the requirements for fault protection?
The maximum disconnection time for a TN system with a nominal voltage of 400 V AC to Earth is?
For a TT system, which one of the following conditions should be fulfilled for each circuit protected by an RCD?
A 32 A type B circuit-breaker is used to give a disconnection time of 5 seconds in a reduced low voltage system with a nominal voltage to Earth (Uo) of 55 V. What is the maximum value of earth fault loop impedance (Zs)?
A SELV source can be derived from which one of the following?
Which one of the following cannot be used as basic protection?
In order to provide basic protection, a horizontal top surface of a barrier or enclosure that is readily accessible shall provide a minimum degree of protection of?
Where arcs, sparks or particles at high temperature may be emitted by fixed equipment in normal service, the equipment shall be?
Except where otherwise recommended by the manufacturer, spotlights and projectors rated at over 100 W and up to 300 W shall be installed at a minimum distance from combustible materials of?
In locations with increased risks of fire, motors which are automatically or remotely controlled, or which are not continuously supervised, shall be protected against excessive temperature by?
Where particular risks of fire exist, the classification for high density occupation areas with easy conditions of evacuation is?
When considering protection against overload, the symbol for the current ensuring effective operation of the protective device is?
What is the impulse category of equipment that is part of the fixed electrical installation and other equipment where a high degree of availability is expected?
For protection against overvoltage a 230 V electricity meter should have an impulse withstand of?
Which of the following is not considered as a potential source of electromagnetic disturbance?
A durable label to BS951 with the words ‘Safety Electrical Connection – Do Not Remove’ is not required at?
With regards to temporary overvoltages (TOV’s), 2 surge protective devices (SPD) should be selected and erected in accordance with the?
A firefighter’s switch shall be provided in the low voltage circuit supplying exterior electrical installations and interior discharge lighting operating at?
A plug and socket-outlet may be used for switching off for mechanical maintenance as long as it has which one of the following
If an area within an installation undergoes a 10 oC rise in ambient temperature, the effect on the current-carrying capacity of cables will be to?
A multicore 70 oC thermoplastic cable with 2.5 mm2 conductors supplies a single-phased load of 20 A at 230 V AC over a distance of 22 metres. The voltage drop in the cable will be?
Where a 3-core cable, with cores coloured brown, black and grey is used as a switch wire for two-way or intermediate control, the terminations of the conductors shall be identified using?
Which one of the following cannot be used as an earth electrode?
An earthing conductor buried in the ground is protected against corrosion by a sheath but is not protected against mechanical damage. The minimum size copper conductor that may be installed is?
Assuming that both the line and protective conductors are of the same material, for a line conductor of 10 mm2 if the protective conductor is to be selected, the minimum tabulated cross-sectional area of its associated protective conductor
. A radial final circuit feeding socket-outlets supplying several items of data processing equipment has a total protective conductor current in normal service of 18 mA. This circuit must have a high integrity protective conductor?
Where an uninterruptible power supply is used it shall comply with?
Where an autotransformer is connected to a circuit having a neutral conductor, the common terminal of the winding shall be connected to the?
When selecting wiring systems for safety services, the type of cable that should be used in fire conditions should comply with the test requirements of?
When carrying out a visual inspection of an electrical installation, which one of the following does not have to be verified?
Certain information must be made available to persons carrying out inspection and testing of an installation before the testing commences. One such item of information would be?
An insulation resistance test is to be carried out on a 3-phase 400 V circuit. The test voltage and minimum acceptable reading would be?
The document which must be produced following the periodic inspection and testing of an existing electrical installation is?
In a room containing a bath, electrical equipment installed in zone 0 shall have a degree of protection of at least?
A flush downlighter in the ceiling less than 2.25m height above floor level over a bath will need to fulfil the requirements of?
Which of the following protective measures is permitted in a room containing a bath or shower?
In a swimming pool or other basin, the metallic covering or sheath or a wiring system in zones 0, 1 or 2 shall?
. The requirements of Section 704 of BS 7671 apply to?
In locations where livestock is kept, for all circuits other than socket-outlet circuits, an RCD shall be provided with a rating not exceeding?
Equipment on a pontoon in a marina that is subject to impact to level AG2 should have a mechanical protection code of?
Distribution boards for Group 2 medical locations should be clearly labelled and installed?
In caravans, each final circuit shall be protected against overcurrent by a device that disconnects?
Equipment doors or hinged panels in operating or maintenance gangways must be able to open a minimum of?
The requirements of the licensing authority should be ascertained for?
I2 can be greater than 1.45 lz when the overcurrent device? a. Is providing overload protection
External influences coded BE are classified as? a. Nature of processed or stored materials
The maximum permitted voltage drop for a 230 V lighting circuit supplied from a public low voltage system is?
An Electrical Installation Certificate should be made out and signed or otherwise authenticated by?
