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17TH Edition , Questions & Answers for Examination 2382-10 Requirements for
1. The external influence code ACM requires IP rated equipment to
a. IPX4
b. IPX1
c. IPO
d. IPX2
Electrical Installations
2. AS 7671 is a
a. document designed solely for the use of electricians
I. legal document used in a court of law
c. Bon statutory document
d. statutory document
3. The fundamental principles of BS7671 state that persons and livestock shall be protected against injury as a
consequence of over voltages originating from
a. motors running
I. the operation of circuit breakers
c. atmospheric events
d. voltage recovery
4. The fundamental principles of BS 7671 covering the protection against voltage disturbances etc., states that the
installation shall have an adequate level of immunity against
a. the weather
b. electromagnetic disturbances
c. voltage loss
d. vibration
5. What is the maximum As for a 10A type C circuit breaker protecting a standard discharge type lighting circuit?
a. 1.15 Ohms
I. 2.30Ohms
c. 1.44Ohms
d. 1.92Ohms
6. A double insulated hand held electric drilling machine is known as
a. class II equipment
b. a DeWalt
c. class HI equipment
d. class I equipment
7. An electrical installation certificate should be signed by
a. the local authority
b. a competent person
c. the customer
d. the REC
8. When considering external influences, the code AD4 requires IP rated equipment to
a. IPXO
b. IPX1
c. IPX4
d. IPX5
9. The external influence code AD1 requires IP rated equipment to
a. IPX4
b. IPX1
c. IPXO
d. IPX2
10. When considering external influences, the code AA5 relates to the ambient temperature range
a. -5°C to +45°C
b. -65°C to +5°C
c. +5°C to +40°C
d. -25°C to 0°C
11. When considering external influences, the code AA1 relates to the ambient temperature range
a. -5°C to +45°C
b. -60°C to +5°C
c. +5°C to +40°C
d. -25°C to 0°C
12. Electrical installations shall be divided into circuits to
a. allow easier access to the installation
b. allow more even distribution of power
c. allow for expansion without changing the maximum demand
d. reduce electromagnetic interference
13. One method of determining the external loop impedance is by taking a reading at
a. the origin of supply
b. the supply and furthest outlet
c. the supply and subtracting the values of R1 + R2
d. the furthest outlet from the supply origin
14. The maximum disconnection time for a 230V a.c. final circuit not exceeding 32 amps, with a TT supply is
a. 3s
b. 0.2s
c. 0.5s
d. 5ms
15. The maximum Zs for a 16A Type B circuit breaker protecting a fixed appliance is
a. 1.87 Ohm
b. 0.87Ohm
c. 2.40Ohm
d. 2.87Ohm
16. Undervottage protection is required when the restoration of power may cause
a. accidental RCD tripping
b. unexpected stalling of the motor
c. overload activation
d. unexpected start-up of the machinery
17, A device which cuts off all or part of an installation from every source of electrical energy provides
a. emergency switching
b. isolatior
c. a fireman's switch
d. partial disconnection
18. For a 32A Type B circuit breaker protecting a standard final ring circuit, the maximum Zs would be
a. 0.70 Ohm
b. 0.30 Ohm
c. 1.44 Ohm
d. 0.20 Ohm
19. In a TT installation, distribution circuits must satisfy a disconnection time of
a. 5s
b. 1s
c. 0.6s
d. 0.2s
20. A residual current device (RCD) works by
a. a magnetic device operating in the event of a fault between Live and earth «-> CORRECT ANSWER
b. a magnetic device operating in the event of a fault between neutral and earth
c. a thin element operating in the event of a fault between neutral and earth
d. a thin element operating in the event of a fault between live and earth
21. A RCBO offers protection against
a. short circuit current
b. short circuit and earth fault current
c. short circuit and overload current
d. basic contact
22. Protective measures against electric shock can be achieved by automatic disconnection of the supply and in systems additional protection by means of an red shall be provided for
a. mobile equipment with a current rating exceeding 32 A
b. mobile equipment with a current not exceeding 22 A
c. socket outlets with a rated current exceeding 20 A
d. socket outlets with a rated current not exceeding 20 A
systems additional protection by means of an rcd shall be provided for
23. Protective measures against electric shock can be achieved by automatic disconnection of the supply and in systems additional protection by means of an red shall be provided for
a. socket outlets with a rated current exceeding 20 A
b. socket outlets with a rated current not exceeding 13 A
c. mobile equipment with a current rating not exceeding 32 A
d. mobile equipment with a current rating exceeding 32 A
24. In a.c. systems in the event of the failure of basic protection, additional protection may be provided by
a. supplementary bonding
b. a time delay 100mA RCD
c. an RCD with an operating current not exceeding 30mA
d. electrical separation
25. If a fault occurs in the HV system, and a magnitude of fault voltage of 430 volts occurs between exposed conductive
parts and earth on the LV installation. What is the maximum tolerable duration of the fault?
a. 10 ms
b. 100 ms
c. 200 ms
d. 300 ms
26. If a Line conductor of an IT system is earthed accidentally, the insulation and components rated for the Line to
Neutral voltage can be temporarily stressed with a higher voltage. What value can this stress voltage reach up to?
a. U=V3 U0
b. U=3U0
c. U=V U0
d. U=U0
27. Nuisance tripping from a large transformer installation can be prevented by
a. the use of an RCD
b. the use of a C type MCB
c. the use of a B type MCB
d. the use of a D type MCB
28. In order to reduce the effects of eddy currents when conductors are drawn through a steel conduit system, they
should be arranged so that
a. they are terminated in the correct phase sequence
b. each conductor of an individual circuit takes approximately the same current
c. they are physically separated from the conductors of other circuits within the conduit
d. they are not individually surrounded by the ferrous material -> CORRECT ANSWER
29. If a cable is buried in a wall less than 50mm depth and is not protected by metallic enclosures, the additional
protection required is
a. RCD protection -
b. MCB protection
c. supplementary bonding
d. external notification of cable routes
30. At which one of the following terminations would a warning notice NOT need to be attached
a. a copper water pipe
b. a bonded gas pipe
c. an earthing terminal within a consumer unit
d. an earth electrode
31. When determining design current, the correction factor that is applied to a BS3036 rewirable fuse is
a. 0.752
b. 0.527
c. 0.725
d. 1.725
32. A BS1361 protective device is also known as a
a. circuit breaker
b. cartridge fuse
c. RCD
d. semi enclosed rewirable fuse
33. An installation protected by an RCD shall have a fixed notice stating
a. the test button should be pressed occasionally
b. the test button should be pressed monthly
c. the test button should be pressed quarterly
d. the test button should be pressed at 6 monthly intervals
34. When insulated a PEN conductor shall be identified with
a. blue insulation along its length
b. green insulation and blue markings at the termination
c. green and yellow insulation and blue markings at the termination
d. green and yellow insulation along its length
35. Outdoor lighting does NOT involve
a. shelters
b. festoon lighting
c. road trafic signals
d. floodlighting
36. Where it is necessary to install cables within a wall consisting of a metal construction, the circuit should
a. adequately bond the studwork
b. be RCD protected
c. be MCB protected
d. be sheathed in metallic conduit
37. Where it is necessary to limit the consequences of the risk of fire due to fault currents, an RCD
a. shall be installed at the end of the circuit to be protected
1. The external influence code ACM requires IP rated equipment to
a. IPX4
b. IPX1
c. IPO
d. IPX2
Electrical Installations
2. AS 7671 is a
a. document designed solely for the use of electricians
I. legal document used in a court of law
c. Bon statutory document
d. statutory document
3. The fundamental principles of BS7671 state that persons and livestock shall be protected against injury as a
consequence of over voltages originating from
a. motors running
I. the operation of circuit breakers
c. atmospheric events
d. voltage recovery
4. The fundamental principles of BS 7671 covering the protection against voltage disturbances etc., states that the
installation shall have an adequate level of immunity against
a. the weather
b. electromagnetic disturbances
c. voltage loss
d. vibration
5. What is the maximum As for a 10A type C circuit breaker protecting a standard discharge type lighting circuit?
a. 1.15 Ohms
I. 2.30Ohms
c. 1.44Ohms
d. 1.92Ohms
6. A double insulated hand held electric drilling machine is known as
a. class II equipment
b. a DeWalt
c. class HI equipment
d. class I equipment
7. An electrical installation certificate should be signed by
a. the local authority
b. a competent person
c. the customer
d. the REC
8. When considering external influences, the code AD4 requires IP rated equipment to
a. IPXO
b. IPX1
c. IPX4
d. IPX5
9. The external influence code AD1 requires IP rated equipment to
a. IPX4
b. IPX1
c. IPXO
d. IPX2
10. When considering external influences, the code AA5 relates to the ambient temperature range
a. -5°C to +45°C
b. -65°C to +5°C
c. +5°C to +40°C
d. -25°C to 0°C
11. When considering external influences, the code AA1 relates to the ambient temperature range
a. -5°C to +45°C
b. -60°C to +5°C
c. +5°C to +40°C
d. -25°C to 0°C
12. Electrical installations shall be divided into circuits to
a. allow easier access to the installation
b. allow more even distribution of power
c. allow for expansion without changing the maximum demand
d. reduce electromagnetic interference
13. One method of determining the external loop impedance is by taking a reading at
a. the origin of supply
b. the supply and furthest outlet
c. the supply and subtracting the values of R1 + R2
d. the furthest outlet from the supply origin
14. The maximum disconnection time for a 230V a.c. final circuit not exceeding 32 amps, with a TT supply is
a. 3s
b. 0.2s
c. 0.5s
d. 5ms
15. The maximum Zs for a 16A Type B circuit breaker protecting a fixed appliance is
a. 1.87 Ohm
b. 0.87Ohm
c. 2.40Ohm
d. 2.87Ohm
16. Undervottage protection is required when the restoration of power may cause
a. accidental RCD tripping
b. unexpected stalling of the motor
c. overload activation
d. unexpected start-up of the machinery
17, A device which cuts off all or part of an installation from every source of electrical energy provides
a. emergency switching
b. isolatior
c. a fireman's switch
d. partial disconnection
18. For a 32A Type B circuit breaker protecting a standard final ring circuit, the maximum Zs would be
a. 0.70 Ohm
b. 0.30 Ohm
c. 1.44 Ohm
d. 0.20 Ohm
19. In a TT installation, distribution circuits must satisfy a disconnection time of
a. 5s
b. 1s
c. 0.6s
d. 0.2s
20. A residual current device (RCD) works by
a. a magnetic device operating in the event of a fault between Live and earth «-> CORRECT ANSWER
b. a magnetic device operating in the event of a fault between neutral and earth
c. a thin element operating in the event of a fault between neutral and earth
d. a thin element operating in the event of a fault between live and earth
21. A RCBO offers protection against
a. short circuit current
b. short circuit and earth fault current
c. short circuit and overload current
d. basic contact
22. Protective measures against electric shock can be achieved by automatic disconnection of the supply and in systems additional protection by means of an red shall be provided for
a. mobile equipment with a current rating exceeding 32 A
b. mobile equipment with a current not exceeding 22 A
c. socket outlets with a rated current exceeding 20 A
d. socket outlets with a rated current not exceeding 20 A
systems additional protection by means of an rcd shall be provided for
23. Protective measures against electric shock can be achieved by automatic disconnection of the supply and in systems additional protection by means of an red shall be provided for
a. socket outlets with a rated current exceeding 20 A
b. socket outlets with a rated current not exceeding 13 A
c. mobile equipment with a current rating not exceeding 32 A
d. mobile equipment with a current rating exceeding 32 A
24. In a.c. systems in the event of the failure of basic protection, additional protection may be provided by
a. supplementary bonding
b. a time delay 100mA RCD
c. an RCD with an operating current not exceeding 30mA
d. electrical separation
25. If a fault occurs in the HV system, and a magnitude of fault voltage of 430 volts occurs between exposed conductive
parts and earth on the LV installation. What is the maximum tolerable duration of the fault?
a. 10 ms
b. 100 ms
c. 200 ms
d. 300 ms
26. If a Line conductor of an IT system is earthed accidentally, the insulation and components rated for the Line to
Neutral voltage can be temporarily stressed with a higher voltage. What value can this stress voltage reach up to?
a. U=V3 U0
b. U=3U0
c. U=V U0
d. U=U0
27. Nuisance tripping from a large transformer installation can be prevented by
a. the use of an RCD
b. the use of a C type MCB
c. the use of a B type MCB
d. the use of a D type MCB
28. In order to reduce the effects of eddy currents when conductors are drawn through a steel conduit system, they
should be arranged so that
a. they are terminated in the correct phase sequence
b. each conductor of an individual circuit takes approximately the same current
c. they are physically separated from the conductors of other circuits within the conduit
d. they are not individually surrounded by the ferrous material -> CORRECT ANSWER
29. If a cable is buried in a wall less than 50mm depth and is not protected by metallic enclosures, the additional
protection required is
a. RCD protection -
b. MCB protection
c. supplementary bonding
d. external notification of cable routes
30. At which one of the following terminations would a warning notice NOT need to be attached
a. a copper water pipe
b. a bonded gas pipe
c. an earthing terminal within a consumer unit
d. an earth electrode
31. When determining design current, the correction factor that is applied to a BS3036 rewirable fuse is
a. 0.752
b. 0.527
c. 0.725
d. 1.725
32. A BS1361 protective device is also known as a
a. circuit breaker
b. cartridge fuse
c. RCD
d. semi enclosed rewirable fuse
33. An installation protected by an RCD shall have a fixed notice stating
a. the test button should be pressed occasionally
b. the test button should be pressed monthly
c. the test button should be pressed quarterly
d. the test button should be pressed at 6 monthly intervals
34. When insulated a PEN conductor shall be identified with
a. blue insulation along its length
b. green insulation and blue markings at the termination
c. green and yellow insulation and blue markings at the termination
d. green and yellow insulation along its length
35. Outdoor lighting does NOT involve
a. shelters
b. festoon lighting
c. road trafic signals
d. floodlighting
36. Where it is necessary to install cables within a wall consisting of a metal construction, the circuit should
a. adequately bond the studwork
b. be RCD protected
c. be MCB protected
d. be sheathed in metallic conduit
37. Where it is necessary to limit the consequences of the risk of fire due to fault currents, an RCD
a. shall be installed at the end of the circuit to be protected
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