electrical certificates 17th edition questions and answers.pdf

Sample Questions - C&G 2382 17th Edition PaperB

1 o/c1 Electrical installation design shall take into account

a electromagnetic disturbances

b direct lightning strikes

c current world copper prices

d local authority planning approval.

2 oc1 The selection of the type of wiring and method of installation is

not influenced by

a the nature of the location

b the load current

c the value of the prospective short-circuit current

d the nature of the structure supporting the wiring.

3 o/c2 The symbol used to show that a BS 88 device has a motor circuit application

a gG

b gM

c l z

d I 2 .

4 oc2 An area or temporary structure used for display, marketing or sales is defined

a a booth

b a stand

c an exhibition

d a show.

5 Which of the following supply characteristics would need to be ascertained for a

new domestic installation?

a Number of points of utilization

b The supply transformer type

c The supply cable size

d The nature of the current and frequency

6 o/c4 Basic protection may be provided by

a barriers and enclosures to IPXXB or IP2X

b fuses and circuit-breakers

c supplementary equipotential bonding

d backup protection.

7 o/c 4 - Which of the following items does not offer ÓbasicÔ protection:

a a circuit protective conductor.

b a socket outlet.

c a lampholder.

d equipotential bonding conductors.

8 18 o/c4 - Class II equipment is used as a measure of:

a overvoltages.

b indirect protection.

c basic protection.

d fault protection.

9 o/c4 table 41.3 - Maximum earth fault loop impedance, according to BS 7671:2008, for

6A Type B circuit breakers giving compliance to 0.4s disconnection time will be:

a 7.67 ohms.

b 8.00 ohms.

c 8.52 ohms.

d 16.4 ohms.

10 o/c4 table 41.1 - All final circuits supplied at 230V and not exceeding 32A shall have a

maximum disconnection time not exceeding:

a 0.2s.

b 0.4s.

c 0.8s.

d 5.0s.

11 o/c 4 Which is a method of fault protection

1 out of reach

2 Reinforced insulation

3 Obstacles

4 Insulation of live parts

12 Oc4 An undervoltage device has operated and restoring the supply may cause

danger. The reclosure of this device should be

a automatic when under the supervision of a competent person

b manually operated

c possible only with the use of a key or tool

d automatic with time delay.

13 o/c4 In locations with increased risks of fire, motors which are automatically or

remotely controlled, or which are nolt continuously supervised, shall be protected

against excessive temperature by

a a protective device that is automatically reset

b a protective device with manual reset

c electronic monitoring equipment that resets

d electronic monitoring equipment that restarts the motor.

14 o/c 5 - Circuits feeding fixed equipment used in highway power supplies shall have a

maximum disconnection time of:

a 0.2 seconds.

b 0.4 seconds.

c 2.0 seconds.

d 5.0 seconds.

15 o/c 5 - A main switch must be capable of withstanding:

a the prospective short circuit current at that point.

b twice the earth loop fault current.

c twice the prospective short circuit current.

d twice the maximum demand.

16 o/c5 A wiring system is to be installed between a safety source and a main

distribution board. The risks required to be reduced to a minimum do not include

a short-circuit

b earth fault

c ageing

d fire.

17 o/c5 514.4.2 - Single core protective conductors coloured green and yellow shall have

one of the colours cover the surface at least and at most:

a 30% and 70%.

b 20% and 80%.

c 50% and 50%.

d 40% and 60%.

18 o/c5 A plug and socket-outlet may be used for switching off for mechanical

maintenance as long as it does not have aurating exceeding

a 13A

b 16A

c 32A

d 45A.

19 oc5 Where more than one firefighter's switch is installed on any one building,

each switch must be

a not more than 3.75m from the ground

b in a locked location to prevent nuisance operation

c electrically linked -

d clearly marked.

20 o/c6 A simple method to allow for measured values of loop impedance to be

effectively compared with tabulated maximum values is to correct these maximum

values by multiplying them by

a 0.75

b 0.8

c 1.2

d 1.8.

21 oc6 When completing an Electrical Installation Certificate, the person who does

noj have to sign the certificate would be the

a tester

b client

c constructor

d designer.

22 o/c7 - Which one of the following protective measures is not applicable to equipment in

Zone 2 of a swimming pool:

a individual protection by electrical separation.

b protection by obstacles.

c SELV.

d protection by an RCD in accordance with Regulation 415.1.1.

23 o/c7 Within a conducting location with restricted movement, supplies to 110 V

mobile equipment must provide protection against electric shock by the use of

a electrical separation

b Class II protection

c obstacles

d PELV.

24 o/c7 The minimum cross sectional area for a cable carrying up to 25A in a caravan shall

be:

a 2.5mm2.

b 4mm2.

c 6mm2.

d 10mm2.

25 o/c 7 - In marinas, equipment installed above a jetty and where it might be subject to

water splashes shall have a degree of ingress protection to at least:

a IPX4.

b IPX5.

c IPX6.

d IPX7.

26 o/c 7 - If cleaning by use of water jets in a room containing a sauna heater electrical

equipment shall have a degree of protection against ingress of at least:

a IP5X.

b IP X5.

c IP4X.

d IPX4.

27 o/c 7 - In agricultural premises an RCD may be used for protection

against fire. The current rating should not exceed:

a 30 mA.

b 100 mA.

c 300 mA.

d 500 mA.

28 oc7 Electrical equipment in a circus installation must have a degree of protection

of at least

a IP33

b IP4X

c IP44

d IPX8.

29 o/c 8 app7 - The positive and negative conductors in two-wire unearthed d.c. power

circuits are identified by the colours:

a red and black.

b red and blue.

c brown and grey.

d brown and black.

30 oc8 A 2.5 mm 2 thermoplastic insulated and sheathed flat cable with protective

conductor is laid in a ceiling beneath thermal insulation 80 mm thick in contact with

the ceiling board, as shown in the figure below. What is its installed rating?

a 17 A

b 20A

c 21A

d 27 A

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