This 18th Edition Exam contains 60 Questions. You have 120 minutes (2 hours) to complete the assessment. You must get a score of 36/60 to pass. Good luck!
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Correct Answer: B
Explanation: Page 446 - The Appendix contents page (P339) indicates Appendix 5 refers to 'Classification of external influences' Appendix 5 starts on page 445 - you will find the answer on page 446. BA refers to 'Capability' if you want to know a little more about these codes browse through the pages that follow (P446) e.g. turn to page 458 and you will see further information on the BA code, you will find it refers to capability of persons
Explanation: Page 446 - The Appendix contents page (P339) indicates Appendix 5 refers to 'Classification of external influences' Appendix 5 starts on page 445 - you will find the answer on page 446. BA refers to 'Capability' if you want to know a little more about these codes browse through the pages that follow (P446) e.g. turn to page 458 and you will see further information on the BA code, you will find it refers to capability of persons
Correct Answer: C
Explanation: Page 402 - Table 4D1B - Appendix 4 - The Appendix contents page (P339) indicates Appendix 4 refers to 'Current-carrying capacity of cables' Appendix 4 starts on page 373
Tip: Don't waste time browsing through the Appendix 4 cable tables, use the Appendix 4 contents page (P373). The column half way down the page indicates 70℃ thermoplastic insulated cables will be in Tables 4D1 to 4D5, the question states the cable will be single-core but no mention of armoured cables so Table 4D1 is going to be the one 322 you need. you will find Table 4D1B on page 402, which indicates the appropriate voltage drop for cables in Table 4D1A. You need to apply the formula shown below;
Where:
mV = The milli-volt drop value in the tables
A = The current in the circuit
m = The length of the cable
First, you need to obtain the milli-volt drop value; using table 4D1B, cross-referencing a 2.5 mm² conductor in the table with two-single cables, touching using reference method C, (column 4) you will find the voltage drop to be 18 mV per Ampere per metre
Putting the values in the question into the formula we get
you must divide by 1000 to convert milli-volts to volts, the answer is a voltage drop of 8.1 volts will occur over the 30 m length of cable
Explanation: Page 402 - Table 4D1B - Appendix 4 - The Appendix contents page (P339) indicates Appendix 4 refers to 'Current-carrying capacity of cables' Appendix 4 starts on page 373
Tip: Don't waste time browsing through the Appendix 4 cable tables, use the Appendix 4 contents page (P373). The column half way down the page indicates 70℃ thermoplastic insulated cables will be in Tables 4D1 to 4D5, the question states the cable will be single-core but no mention of armoured cables so Table 4D1 is going to be the one 322 you need. you will find Table 4D1B on page 402, which indicates the appropriate voltage drop for cables in Table 4D1A. You need to apply the formula shown below;
Where:
mV = The milli-volt drop value in the tables
A = The current in the circuit
m = The length of the cable
First, you need to obtain the milli-volt drop value; using table 4D1B, cross-referencing a 2.5 mm² conductor in the table with two-single cables, touching using reference method C, (column 4) you will find the voltage drop to be 18 mV per Ampere per metre
Putting the values in the question into the formula we get
you must divide by 1000 to convert milli-volts to volts, the answer is a voltage drop of 8.1 volts will occur over the 30 m length of cable
3. Who should be given the original version of an Electrical Installation Certificate?
Mark one answer
B
C
D
Correct Answer: D
Explanation: Page 464 - Notes 1 - Appendix 6 - The Appendix contents page (P339) indicates Appendix 6 refers to 'Model forms for certification and reporting' Appendix 6 starts on page 461 the answer is at the bottom of Note 1 page 464, it is the person ordering the work
Explanation: Page 464 - Notes 1 - Appendix 6 - The Appendix contents page (P339) indicates Appendix 6 refers to 'Model forms for certification and reporting' Appendix 6 starts on page 461 the answer is at the bottom of Note 1 page 464, it is the person ordering the work
B
C
D
Correct Answer: D
Explanation: Page 487 - The Appendix contents page (P339) indicates Appendix 8 refers to 'Current carrying capacity and voltage drop for busbar trunking and powertrack systems' Appendix 8 starts on page 487. you will find the answer in Note 3, which advises, for the 'Effective current-carrying capacity', Iz must be not less than Ib, or in other words, Iz must be greater than or equal to Ib which is what the formula indicates e.g. Iz ≥ Ib means Iz is Greater than or Equal to Ib
Explanation: Page 487 - The Appendix contents page (P339) indicates Appendix 8 refers to 'Current carrying capacity and voltage drop for busbar trunking and powertrack systems' Appendix 8 starts on page 487. you will find the answer in Note 3, which advises, for the 'Effective current-carrying capacity', Iz must be not less than Ib, or in other words, Iz must be greater than or equal to Ib which is what the formula indicates e.g. Iz ≥ Ib means Iz is Greater than or Equal to Ib
5. What is the minimum allowable sise of copper cable used for a main protective bonding conductor?
Mark one answer
B
C
D
Correct Answer: D
Explanation: Page 202 - 544.1.1 - The part 5 contents page (P124) indicates section 544 refers to 'Protective bonding conductors' Page 202 - 544.1.1 first paragraph provides the answer
Explanation: Page 202 - 544.1.1 - The part 5 contents page (P124) indicates section 544 refers to 'Protective bonding conductors' Page 202 - 544.1.1 first paragraph provides the answer
B
C
D
Correct Answer: A
Explanation: Page 225 - 560.6.9 Note 1: - The part 5 contents page (P125) indicates section 560.6 refers to 'Electrical sources for Safety services' turning to section 560.6 (P224) a quick skim down the section reveals 560.6.9 Note 1 and the answer
Explanation: Page 225 - 560.6.9 Note 1: - The part 5 contents page (P125) indicates section 560.6 refers to 'Electrical sources for Safety services' turning to section 560.6 (P224) a quick skim down the section reveals 560.6.9 Note 1 and the answer
Correct Answer: A
Explanation: Page 148 - 528.1 (i) - The part 5 contents page (P124) indicates section 528 refers to 'Proximity of wiring systems to other services' you need to realise this is the key part of this question. Page 148 - 528.1 (i) provides the answer
Explanation: Page 148 - 528.1 (i) - The part 5 contents page (P124) indicates section 528 refers to 'Proximity of wiring systems to other services' you need to realise this is the key part of this question. Page 148 - 528.1 (i) provides the answer
8. An installation includes a d.c. power circuit with a grey coloured cable, which terminal does this cable connect to?
Mark one answer
B
C
D
Correct Answer: C
Explanation: Page 131 - Table 51 - The part 5 contents page (P124) indicates section 514 refers to 'Identification and notices' on page 131 you will find Table 51 - All d.c. grey wires are negative. Conductor colour identification is in Table 51; you should try to memorise this. If you forget, try to remember a list of all tables appears on page 522, just before the index section
Explanation: Page 131 - Table 51 - The part 5 contents page (P124) indicates section 514 refers to 'Identification and notices' on page 131 you will find Table 51 - All d.c. grey wires are negative. Conductor colour identification is in Table 51; you should try to memorise this. If you forget, try to remember a list of all tables appears on page 522, just before the index section
9. A powertrack system shall be installed in accordance with the manufactures instructions, taking into account?
Mark one answer
B
C
D
Correct Answer: A
Explanation: Page 136 - 521.4 - The part 5 contents page does not point to this answer, unless you realise this question refers to section 521 'Types of wiring system' so try the chapter 52 contents section (P135). Here you will see 521.4 refers to 'Busbar trunking systems and powertrack systems. Turning to 521.4 you will find the answer, whilst the other answers may well have an influence, these are not listed in the regulations
Explanation: Page 136 - 521.4 - The part 5 contents page does not point to this answer, unless you realise this question refers to section 521 'Types of wiring system' so try the chapter 52 contents section (P135). Here you will see 521.4 refers to 'Busbar trunking systems and powertrack systems. Turning to 521.4 you will find the answer, whilst the other answers may well have an influence, these are not listed in the regulations
10. An RCD is to be used to provide protection against electric shock, the RCD shall be capable of disconnecting?
Mark one answer
B
C
D
Correct Answer: C
Explanation: Page 154 - 531.3.1 - The part 5 contents page (P124) indicates section 531 refers to 'Devices for protection against electric shock by ADS' you need to realise an RCD is a device for fault protection and uses automatic disconnection of the supply (ADS) to achieve this. Section 531 starts on page 152, skimming the section looking for RCD's in 531.3.1 you will find the answer. The RCD measures any imbalance in current flow between the neutral and line conductor, which would occur in the event of a fault between the line conductor and earth
Explanation: Page 154 - 531.3.1 - The part 5 contents page (P124) indicates section 531 refers to 'Devices for protection against electric shock by ADS' you need to realise an RCD is a device for fault protection and uses automatic disconnection of the supply (ADS) to achieve this. Section 531 starts on page 152, skimming the section looking for RCD's in 531.3.1 you will find the answer. The RCD measures any imbalance in current flow between the neutral and line conductor, which would occur in the event of a fault between the line conductor and earth
Correct Answer: A
Explanation: Page 230 - 641.6 - The part 6 contents page (P228) indicates chapter 64 refers to 'Initial verification' you will find this section on page 230 it is simply a matter of browsing down the page until you come to 641.6 which provides the answer
Explanation: Page 230 - 641.6 - The part 6 contents page (P228) indicates chapter 64 refers to 'Initial verification' you will find this section on page 230 it is simply a matter of browsing down the page until you come to 641.6 which provides the answer
B
C
D
Correct Answer: B
Explanation: Page 231 - 643.1 fourth paragraph - The part 6 contents page (P228) indicates section 643 refers to 'Testing' You will find the answer in the fourth paragraph of 643.1 which states the tests of regulations 643.2 to 643.6 shall be carried out in that order before the installation is energised. Where the installation incorporates an earth electrode test 643.7.2 shall also be carried out before the installation is energised. The tests are listed below:
Guide:
643.1 states test's 1 - 6 must be performed before the installation is energised
1) 643.2 Continuity of all protective conductors including main, equipotential extraneous bonding conductors, and continuity of ring final circuits
2) 643.3 Insulation resistance
3) 643.4 Protection by SELV, PELV or electrical separation or barriers
4) 643.5 Insulation resistance/impedance of floors and walls
5) 643.6 Polarity
6) 643.7.2 Earth electrode resistance
Tests to be performed once the installation is energised
7) 643.7 Protection by automatic disconnection of supply
8) 643.7.3 Earth fault loop impedance
9) 643.7.3.201 Prospective fault current
10) 643.8 Additional protection e.g. RCD's
11) 643.9 Phase sequence
12) 643.10 Functional testing
13) 643.11 Verification of voltage drop
Explanation: Page 231 - 643.1 fourth paragraph - The part 6 contents page (P228) indicates section 643 refers to 'Testing' You will find the answer in the fourth paragraph of 643.1 which states the tests of regulations 643.2 to 643.6 shall be carried out in that order before the installation is energised. Where the installation incorporates an earth electrode test 643.7.2 shall also be carried out before the installation is energised. The tests are listed below:
Guide:
643.1 states test's 1 - 6 must be performed before the installation is energised
1) 643.2 Continuity of all protective conductors including main, equipotential extraneous bonding conductors, and continuity of ring final circuits
2) 643.3 Insulation resistance
3) 643.4 Protection by SELV, PELV or electrical separation or barriers
4) 643.5 Insulation resistance/impedance of floors and walls
5) 643.6 Polarity
6) 643.7.2 Earth electrode resistance
Tests to be performed once the installation is energised
7) 643.7 Protection by automatic disconnection of supply
8) 643.7.3 Earth fault loop impedance
9) 643.7.3.201 Prospective fault current
10) 643.8 Additional protection e.g. RCD's
11) 643.9 Phase sequence
12) 643.10 Functional testing
13) 643.11 Verification of voltage drop
Correct Answer: C
Explanation: Page 230 - 641.3 - The part 6 contents page (P228) indicates chapter 64 refers to 'Initial Verification'. You need the realise Initial Verification is the main theme of this question, then it is simply a matter of browsing chapter 64; you will find the answer in 641.3
Explanation: Page 230 - 641.3 - The part 6 contents page (P228) indicates chapter 64 refers to 'Initial Verification'. You need the realise Initial Verification is the main theme of this question, then it is simply a matter of browsing chapter 64; you will find the answer in 641.3
Correct Answer: A
Explanation: Page 232 - Table 64 - The part 6 contents page (P228) indicates section 643.3 refers to 'Insulation Resistance, you will find Table 64 on (P232) you can see from Table 64 a SELV or PELV circuit requires an insulation resistance of at least 0.5 MΩ to be in compliance with the reg's. 0.5 mΩ would be the wrong answer mΩ represents milli-ohms, and for insulation resistance we are looking for Mega-ohms (MΩ)
Explanation: Page 232 - Table 64 - The part 6 contents page (P228) indicates section 643.3 refers to 'Insulation Resistance, you will find Table 64 on (P232) you can see from Table 64 a SELV or PELV circuit requires an insulation resistance of at least 0.5 MΩ to be in compliance with the reg's. 0.5 mΩ would be the wrong answer mΩ represents milli-ohms, and for insulation resistance we are looking for Mega-ohms (MΩ)
Correct Answer: D
Explanation: Page 260/261 - 705.544.2 - The part 7 contents page (P239) indicates section 705 refers to 'Agricultural and horticultural premises' you will find section 705 on page 258. you need to look for some reference to 'Protective bonding conductors' and in 705.544.2 you will find the answer. The other options are all listed examples that may be used. You should know that uncoated steel mesh would soon corrode in the damp environment of agricultural land, so it is obviously not a suitable material for a bonding conductor
Explanation: Page 260/261 - 705.544.2 - The part 7 contents page (P239) indicates section 705 refers to 'Agricultural and horticultural premises' you will find section 705 on page 258. you need to look for some reference to 'Protective bonding conductors' and in 705.544.2 you will find the answer. The other options are all listed examples that may be used. You should know that uncoated steel mesh would soon corrode in the damp environment of agricultural land, so it is obviously not a suitable material for a bonding conductor
16. For electrical installations in Caravans and Motor Caravans, the nominal d.c. supply voltage shall not exceed?
Mark one answer
B
C
D
Correct Answer: D
Explanation: Page 306 - 721.1 - The part 7 contents page (P239) indicates section 721 refers to 'Electrical Installations in Caravans & Motor Caravans' you will find section 721 on page 306 and in 721.1 Scope you will find the answer 48 V d.c.
Explanation: Page 306 - 721.1 - The part 7 contents page (P239) indicates section 721 refers to 'Electrical Installations in Caravans & Motor Caravans' you will find section 721 on page 306 and in 721.1 Scope you will find the answer 48 V d.c.
17. On a marina what is the minimum height above the highest water level that a socket-outlet may be placed (excluding floating pontoons)?
Mark one answer
B
C
D
Correct Answer: B
Explanation: Page 272 - 709.553.1.13 - The part 7 contents page (P239) indicates section 709 refers to 'Marinas and similar locations' Section 709 starts on page 270, you need to look for some reference to 'socket-outlets' and in 709.553.1.13 you will find the answer, socket-outlets shall be placed at a height of not less than 1 m above the highest water level
Explanation: Page 272 - 709.553.1.13 - The part 7 contents page (P239) indicates section 709 refers to 'Marinas and similar locations' Section 709 starts on page 270, you need to look for some reference to 'socket-outlets' and in 709.553.1.13 you will find the answer, socket-outlets shall be placed at a height of not less than 1 m above the highest water level
18. The type of bath shown in the image below is installed in a domestic bathroom, the area under the bath is considered to be?
Mark one answer
B
C
D
Correct Answer: C
Explanation: Page 240 - 701.32.3 last paragraph - The part 7 contents page (P239) indicates section 701 refers to 'Locations containing a bath or shower'. Section 701 starts on page 240, if you don't know the answer to this question, which you should then start looking through the descriptions of the zones. This is a Victorian style bath with no panelling covering the bottom of the bath area. you will find the answer in the note at the bottom of 701.32.3 which states 'the space under the bath tub or shower basin is considered to be zone 1' However, if the space under the bath tub or shower basin is only accessible with a tool, it is considered to be outside the zones
Explanation: Page 240 - 701.32.3 last paragraph - The part 7 contents page (P239) indicates section 701 refers to 'Locations containing a bath or shower'. Section 701 starts on page 240, if you don't know the answer to this question, which you should then start looking through the descriptions of the zones. This is a Victorian style bath with no panelling covering the bottom of the bath area. you will find the answer in the note at the bottom of 701.32.3 which states 'the space under the bath tub or shower basin is considered to be zone 1' However, if the space under the bath tub or shower basin is only accessible with a tool, it is considered to be outside the zones
Correct Answer: D
Explanation: Page 290 - 712.537.2.2.5 - The part 7 contents page (P239) indicates section 712 refers to 'Solar photovoltaic (PV) power supply systems' you will find section 712 on page 288, and you need to search for some reference to 'Isolation' as a switch-disconnector is a device for isolation. you will find the answer in 712.537.2.2.5 'A switch-disconnector shall be provided on the DC side of the PV convertor'
Explanation: Page 290 - 712.537.2.2.5 - The part 7 contents page (P239) indicates section 712 refers to 'Solar photovoltaic (PV) power supply systems' you will find section 712 on page 288, and you need to search for some reference to 'Isolation' as a switch-disconnector is a device for isolation. you will find the answer in 712.537.2.2.5 'A switch-disconnector shall be provided on the DC side of the PV convertor'
B
C
D
Correct Answer: A
Explanation: Page 245 - 702.410.3.4.1 - The part 7 contents page (P239) indicates section 702 refers to 'Swimming pools and other basins' you will find section 702 on page 245, browsing for a solution, you will find in Fig 702.1 to Fig 702.4 (P250-253) the basin of a fountain is in zone 0 you will find the answer in 702.410.3.4.1 (P245) at the bottom of the page. In zone 0 protection only by SELV at a voltage not exceeding 12 V is permitted
Explanation: Page 245 - 702.410.3.4.1 - The part 7 contents page (P239) indicates section 702 refers to 'Swimming pools and other basins' you will find section 702 on page 245, browsing for a solution, you will find in Fig 702.1 to Fig 702.4 (P250-253) the basin of a fountain is in zone 0 you will find the answer in 702.410.3.4.1 (P245) at the bottom of the page. In zone 0 protection only by SELV at a voltage not exceeding 12 V is permitted
21. On a caravan or camping park underground cables shall be buried at a depth of at least?
Mark one answer
B
C
D
Correct Answer: C
Explanation: Page 266 - 708.521.7.2 - The part 7 contents page (P239) indicates section 708 refers to 'Electrical installations in caravan and camping parks' 708 starts on page 265; the answer is in 708.521.7.2 which states cables must be buried to a depth of at least 0.6 metres
Explanation: Page 266 - 708.521.7.2 - The part 7 contents page (P239) indicates section 708 refers to 'Electrical installations in caravan and camping parks' 708 starts on page 265; the answer is in 708.521.7.2 which states cables must be buried to a depth of at least 0.6 metres
22. What is the recommended minimum level of protection for equipment within a Sauna where water jets used for cleaning may be expected?
Mark one answer
B
C
D
Correct Answer: C
Explanation: Page 255 - 703.512.2 - The part 7 contents page (P239) indicates section 703 refers to 'Rooms and cabins containing sauna heaters' Section 703 starts on page 254, skimming the section looking for any reference to External Influences or IP codes. you will find them on page 254 in 703.512.2 (P255) states that if cleaning by use of water jets IPX5 is required
Explanation: Page 255 - 703.512.2 - The part 7 contents page (P239) indicates section 703 refers to 'Rooms and cabins containing sauna heaters' Section 703 starts on page 254, skimming the section looking for any reference to External Influences or IP codes. you will find them on page 254 in 703.512.2 (P255) states that if cleaning by use of water jets IPX5 is required
B
C
D
Correct Answer: D
Explanation: Page 276 - 710.411.3.2.5 - The part 7 contents page (P239) indicates section 710 refers to 'Medical locations' section 710 starts on page 275, unless you know to look for the heading 'Automatic disconnection in case of a fault' you probably would have a difficult time to find this answer. The answer is in 710.411.3.2.5 (P276) the value shall not exceed 60 V d.c.
Explanation: Page 276 - 710.411.3.2.5 - The part 7 contents page (P239) indicates section 710 refers to 'Medical locations' section 710 starts on page 275, unless you know to look for the heading 'Automatic disconnection in case of a fault' you probably would have a difficult time to find this answer. The answer is in 710.411.3.2.5 (P276) the value shall not exceed 60 V d.c.
24. In a domestic bathroom where protection to a circuit is provided by a SELV source, which of the following protective measures is permitted?
Mark one answer
B
C
D
Correct Answer: A
Explanation: Page 241 - 701.414.4.5 - The part 7 contents page (P239) indicates section 701 refers to 'Locations containing a bath or shower' the 'key' to finding this answer is to look for the term 'SELV circuits' you will find this in 701.414.4.5 and the answer.
Explanation: Page 241 - 701.414.4.5 - The part 7 contents page (P239) indicates section 701 refers to 'Locations containing a bath or shower' the 'key' to finding this answer is to look for the term 'SELV circuits' you will find this in 701.414.4.5 and the answer.
- Placing out of reach - Not Permitted - 701.410.3.5
- Obstacles - Not Permitted - 701.410.3.5
- Earth-free local equipotential bonding - Not Permitted - 701.410.3.6
- Barriers or enclosures complying with regulation 416.2
B
C
D
Correct Answer: B
Explanation: Page 394 - Table 4B1 - The Appendix contents page (P339) indicates Appendix 4 refers to 'Current-carrying capacity of cables' Appendix 4 starts on page 373, the Appendix 4 contents page indicates Table 4B1 refers to 'Ambient air temperature correction factors' you will find Table 4B1 on page 394; you need to look in the column under 70℃ thermoplastic and cross-reference this to the 'Ambient temperature' row for 40℃, you will find the cable derating factor is 0.87
Explanation: Page 394 - Table 4B1 - The Appendix contents page (P339) indicates Appendix 4 refers to 'Current-carrying capacity of cables' Appendix 4 starts on page 373, the Appendix 4 contents page indicates Table 4B1 refers to 'Ambient air temperature correction factors' you will find Table 4B1 on page 394; you need to look in the column under 70℃ thermoplastic and cross-reference this to the 'Ambient temperature' row for 40℃, you will find the cable derating factor is 0.87
Correct Answer: C
Explanation: Page 45 - 311.1 - The part 3 Contents page (P44) provides no help here so look in the Index section page 532 - 'Design, economic and reliable' and you are directed to section 311.1 - Try to remember any question like this will probably be a 'Maximum Demand and Diversity' question
Explanation: Page 45 - 311.1 - The part 3 Contents page (P44) provides no help here so look in the Index section page 532 - 'Design, economic and reliable' and you are directed to section 311.1 - Try to remember any question like this will probably be a 'Maximum Demand and Diversity' question
27. Which of the following is an assessment of the compatibility of characteristics, of equipment used?
Mark one answer
B
C
D
Correct Answer: C
Explanation: Page 51 - 331.1 (xii) - The part 3 contents page (P44) indicates section 331 refers to 'Compatibility of characteristics' upon turning to this section (P51) you will see the list of 'Compatibility of Characteristics' and under 331.1 (xii) you will find 'Power factor'
Explanation: Page 51 - 331.1 (xii) - The part 3 contents page (P44) indicates section 331 refers to 'Compatibility of characteristics' upon turning to this section (P51) you will see the list of 'Compatibility of Characteristics' and under 331.1 (xii) you will find 'Power factor'
Correct Answer: D
Explanation: Page 45 - 301.1 (i) - The part 3 contents page (P44) indicates chapter 30 refers to 'Assessment of General Characteristics' - The purpose for which the installation is intended to be used is listed, the other answer options are NOT. Try to remember when attempting Part 3 questions, any question that refers to 'an assessment of the general characteristics' the answer will probably be found in section 301.1
Explanation: Page 45 - 301.1 (i) - The part 3 contents page (P44) indicates chapter 30 refers to 'Assessment of General Characteristics' - The purpose for which the installation is intended to be used is listed, the other answer options are NOT. Try to remember when attempting Part 3 questions, any question that refers to 'an assessment of the general characteristics' the answer will probably be found in section 301.1
Correct Answer: A
Explanation: Page 52 - 361.1 (iv) - The 'key' to answering this question is to focus on the key phrase in the question, which is 'an assessment for continuity of service' The part 3 contents page (P44) indicates chapter 36 refers to 'Continuity of Service' the answer is found in 361.1 (iv) Multiple power supplies is listed. Whilst the other answers may need consideration only answer Multiple power supplies is listed, and as such is the only answer to select
Explanation: Page 52 - 361.1 (iv) - The 'key' to answering this question is to focus on the key phrase in the question, which is 'an assessment for continuity of service' The part 3 contents page (P44) indicates chapter 36 refers to 'Continuity of Service' the answer is found in 361.1 (iv) Multiple power supplies is listed. Whilst the other answers may need consideration only answer Multiple power supplies is listed, and as such is the only answer to select
Correct Answer: A
Explanation: Page 82 - 422.3.4 - Starting with the part 4 contents page, (P53) you will find section 422 is for 'Precautions where particular risks of fire exists'. Browsing to this section (P81) and scanning down the section, you will see quite a few BS numbers contained in section 422 so we look for any regulation to do with cables, within 422.3.4 second sentence you will find the answer
Explanation: Page 82 - 422.3.4 - Starting with the part 4 contents page, (P53) you will find section 422 is for 'Precautions where particular risks of fire exists'. Browsing to this section (P81) and scanning down the section, you will see quite a few BS numbers contained in section 422 so we look for any regulation to do with cables, within 422.3.4 second sentence you will find the answer
31. A single-phase reduced low voltage system has been installed with a 25 amp BS 88-2 fuse, what is the maximum allowable value of Zs?
Mark one answer
B
C
D
Correct Answer: B
Explanation: Page 68 - Table 41.6 - The part 4 contents page (P53) indicates section 411 refers to 'Protective measure - Automatic disconnection of supply' this usually refers to anything to do with fuses and MCB's. So, check out the Chapter 41 contents page (P55), here you will find section 411.8 refers to 'Reduced low voltage systems' This looks a good place to start, so turning to section 411.8 (P67) we are looking for tables to do with Zs values. On the next page (P68) you will find Table 41.6 - You are informed in the bold text at the top of the table the 55-volt columns are for single-phase systems.
Now cross-referencing the row for 25 amps, with the column for BS 88-2 fuses with a nominal voltage of 55 V and you will find the answer 0.52 Ω. Don't make the mistake of using Tables 41.2, 41.3, 41.4 or 41.5 these are for a nominal voltage of 230 V (Not reduced low voltage systems) - You must make a mental note the answer to these reduced low voltage earth fault loop impedance questions are usually found in Table 41.6
Explanation: Page 68 - Table 41.6 - The part 4 contents page (P53) indicates section 411 refers to 'Protective measure - Automatic disconnection of supply' this usually refers to anything to do with fuses and MCB's. So, check out the Chapter 41 contents page (P55), here you will find section 411.8 refers to 'Reduced low voltage systems' This looks a good place to start, so turning to section 411.8 (P67) we are looking for tables to do with Zs values. On the next page (P68) you will find Table 41.6 - You are informed in the bold text at the top of the table the 55-volt columns are for single-phase systems.
Now cross-referencing the row for 25 amps, with the column for BS 88-2 fuses with a nominal voltage of 55 V and you will find the answer 0.52 Ω. Don't make the mistake of using Tables 41.2, 41.3, 41.4 or 41.5 these are for a nominal voltage of 230 V (Not reduced low voltage systems) - You must make a mental note the answer to these reduced low voltage earth fault loop impedance questions are usually found in Table 41.6
Correct Answer: A
Explanation: Page 53 - The part 4 contents page (P53) indicates chapter 43 refers to 'Protection against overcurrent'
Explanation: Page 53 - The part 4 contents page (P53) indicates chapter 43 refers to 'Protection against overcurrent'
Correct Answer: A
Explanation: Page 76 - 418.1 - The part 4 contents page provides no guidance for this question, but (P55) does, you will find that section 418.1 refers to 'Non-conducting locations' Upon turning to this section (P76) reveals 418.1 and the answer
Explanation: Page 76 - 418.1 - The part 4 contents page provides no guidance for this question, but (P55) does, you will find that section 418.1 refers to 'Non-conducting locations' Upon turning to this section (P76) reveals 418.1 and the answer
34. When selecting a device for overload protection, the device must be co-ordinated with the conductor to ensure?
Mark one answer
B
C
D
Correct Answer: B
Explanation: Page 89 - 433.1.1(iii) - The part 4 contents page (P53) indicates section 433 is for 'Protection against overload current'. The chapter 43 contents page (P86) provides further guidance here you will find that 433.1 refers to 'Co-ordination between conductor and overload protective device' so it would make sense to start here. Turning to section 433 (P89) and you will find the answer in 433.1.1 (iii)
Explanation: Page 89 - 433.1.1(iii) - The part 4 contents page (P53) indicates section 433 is for 'Protection against overload current'. The chapter 43 contents page (P86) provides further guidance here you will find that 433.1 refers to 'Co-ordination between conductor and overload protective device' so it would make sense to start here. Turning to section 433 (P89) and you will find the answer in 433.1.1 (iii)
Correct Answer: C
Explanation: Page 58 - 411.3.1.2 - The part 4 contents page provides no guidance to answering this question, so try the index searching for 'extraneous conductive part' You will find a reference to this on (P536) and you are looking for a part 4 regulation. you will find 'extraneous conductive part - bonding of' refers to 411.3.1.2 and 415.2 so check out these two regulations. you will find the answer on (P58) 411.3.1.2 so there is no point in checking out 415.2
Explanation: Page 58 - 411.3.1.2 - The part 4 contents page provides no guidance to answering this question, so try the index searching for 'extraneous conductive part' You will find a reference to this on (P536) and you are looking for a part 4 regulation. you will find 'extraneous conductive part - bonding of' refers to 411.3.1.2 and 415.2 so check out these two regulations. you will find the answer on (P58) 411.3.1.2 so there is no point in checking out 415.2
Correct Answer: A
Explanation: Page 113 - 444.4.7 Note - The key to answering this question is 'transfer of supply' unfortunately the part 4 contents page provides no direction to this answer, neither do any of the other contents pages or the index, but you bought this book so hopefully you may remember this type of question. This answer falls under 444.4.7 'Transfer of supply'
Explanation: Page 113 - 444.4.7 Note - The key to answering this question is 'transfer of supply' unfortunately the part 4 contents page provides no direction to this answer, neither do any of the other contents pages or the index, but you bought this book so hopefully you may remember this type of question. This answer falls under 444.4.7 'Transfer of supply'
37. Simultaneously accessible exposed-conductive parts shall be connected to the same earthing system?
Mark one answer
B
C
D
Correct Answer: B
Explanation: Page 58 - 411.3.1.1 - The part 4 contents pages provides no guidance to answering this question. However, checking the index for 'exposed conductive part' (P536) revels a number of possible answers in part 4. So, trailing through these reg's you will find 411.3.1.1 provides the answer
Explanation: Page 58 - 411.3.1.1 - The part 4 contents pages provides no guidance to answering this question. However, checking the index for 'exposed conductive part' (P536) revels a number of possible answers in part 4. So, trailing through these reg's you will find 411.3.1.1 provides the answer
Correct Answer: A
Explanation: Page 105 - Table 443.2 - The part 4 contents page (P53) indicates 'Protection against transient overvoltages of atmospheric origin' (lightning) are covered in chapter 443. It is a simple case of cross-referencing the Category II column with the 120-volt row and you will find the answer to be 1.5, this is 1.5 kilo-volts
Explanation: Page 105 - Table 443.2 - The part 4 contents page (P53) indicates 'Protection against transient overvoltages of atmospheric origin' (lightning) are covered in chapter 443. It is a simple case of cross-referencing the Category II column with the 120-volt row and you will find the answer to be 1.5, this is 1.5 kilo-volts
Correct Answer: A
Explanation: Page 84 - 422.4 - The part 4 contents page (P53) indicates section 422 refers to 'Precautions where particular risks of fire exist'. However, this is not much use to you if you don't realise what the CA2 code refers to. So, check out the appendices contents page (P339) you will find 'External Influences' are in appendix 5 (P445) Turning to this appendix you will find at the bottom of the next page (P446) CA2 refers to combustible material
Explanation: Page 84 - 422.4 - The part 4 contents page (P53) indicates section 422 refers to 'Precautions where particular risks of fire exist'. However, this is not much use to you if you don't realise what the CA2 code refers to. So, check out the appendices contents page (P339) you will find 'External Influences' are in appendix 5 (P445) Turning to this appendix you will find at the bottom of the next page (P446) CA2 refers to combustible material
B
C
D
Correct Answer: C
Explanation: Page 97-98 - 442.1.2 - Symbols - The part 4 contents page (P53) indicates section 442 refers to 'Protection of low voltage installations, etc.' If you get any questions like the one above in your exam you need to remember the answer is in this section
Explanation: Page 97-98 - 442.1.2 - Symbols - The part 4 contents page (P53) indicates section 442 refers to 'Protection of low voltage installations, etc.' If you get any questions like the one above in your exam you need to remember the answer is in this section
41. In an IT system that does not have a neutral conductor it is permitted to omit a device to provide overload protection if?
Mark one answer
B
C
D
Correct Answer: A
Explanation: Page 90 - 433.3.2.2 - The part 4 contents page (P53) indicates section 433 is for 'Protection against overload current'. The chapter 43 contents page (P86) provides further guidance here you will find that 433.3.2 refers to 'Position or omission of devices for protection against overload in an IT system' so it would make sense to start here. Turning to section 433.3.2 (P90) and skimming down the page you will find 433.3.2.2, and the answer
Explanation: Page 90 - 433.3.2.2 - The part 4 contents page (P53) indicates section 433 is for 'Protection against overload current'. The chapter 43 contents page (P86) provides further guidance here you will find that 433.3.2 refers to 'Position or omission of devices for protection against overload in an IT system' so it would make sense to start here. Turning to section 433.3.2 (P90) and skimming down the page you will find 433.3.2.2, and the answer
B
C
D
Correct Answer: A
Explanation: Page 61 - Table 41.2 relates to 0.4-second disconnection times, and lists the Maximum permitted Zs values for a circuit. If we look at the values for a 20 Amp BS 88-2 fuse, we will see the maximum permitted value is 1.68 Ω, the Zs value quoted in this question is 2.4 Ω, which exceeds 1.68 Ω, so we cannot use a 20 Amp fuse. The next fuse rating downwards is a 16 Amp fuse, this has a maximum permitted Zs value of 2.43 Ω, since the value given in the question 2.4 Ω is less than this 2.43 Ω maximum, we can select a 16-amp fuse, this is the highest rating fuse we could select for this circuit
Guide: It is important that the student knows the maximum Zs values in Tables 41.2 to 41.5 are based on sound mathematical fact.
As an example, only: If we consider the case of the 16 Amp BS 88-2 fuse in the previous question, we can calculate the fault current as follows:
If we now consult the fuse table (P368) you will find the table shown below
We are informed in the question we are using 0.4 second disconnection times, this means we are referring to equipment that can be moved and touched (Not fixed). So, we project a horizontal line on the graph from 0.4 seconds as shown (Red Line). We now project a vertical line somewhere close to 94 Amps (Blue line)
you will find the point on the graph where the Red line and Blue line cross is on the 16 Amp curve. This means with 230 V and Zs of 2.43 Ω, a 16 Amp BS 88-2 fuse would disconnection within 0.4 seconds if 94 amps of fault current flowed in the circuit.
Explanation: Page 61 - Table 41.2 relates to 0.4-second disconnection times, and lists the Maximum permitted Zs values for a circuit. If we look at the values for a 20 Amp BS 88-2 fuse, we will see the maximum permitted value is 1.68 Ω, the Zs value quoted in this question is 2.4 Ω, which exceeds 1.68 Ω, so we cannot use a 20 Amp fuse. The next fuse rating downwards is a 16 Amp fuse, this has a maximum permitted Zs value of 2.43 Ω, since the value given in the question 2.4 Ω is less than this 2.43 Ω maximum, we can select a 16-amp fuse, this is the highest rating fuse we could select for this circuit
Guide: It is important that the student knows the maximum Zs values in Tables 41.2 to 41.5 are based on sound mathematical fact.
As an example, only: If we consider the case of the 16 Amp BS 88-2 fuse in the previous question, we can calculate the fault current as follows:
If we now consult the fuse table (P368) you will find the table shown below We are informed in the question we are using 0.4 second disconnection times, this means we are referring to equipment that can be moved and touched (Not fixed). So, we project a horizontal line on the graph from 0.4 seconds as shown (Red Line). We now project a vertical line somewhere close to 94 Amps (Blue line)
you will find the point on the graph where the Red line and Blue line cross is on the 16 Amp curve. This means with 230 V and Zs of 2.43 Ω, a 16 Amp BS 88-2 fuse would disconnection within 0.4 seconds if 94 amps of fault current flowed in the circuit.
Correct Answer: A
Explanation: Page 81 - 422.1.3 - The part 4 contents page (P53) indicates section 422 refers to 'Precautions where particular risks of fire exist' this is not much use to you if you don't realise the relationship between section 422 and the question. You need to remember this may mean where BE2 conditions exist, where there is a risk of fire due to processed or stored materials. The index will not provide the answer to this question either. However, if any questions come up in your exam to do with temperature cut-outs, now you know where the answer is
Explanation: Page 81 - 422.1.3 - The part 4 contents page (P53) indicates section 422 refers to 'Precautions where particular risks of fire exist' this is not much use to you if you don't realise the relationship between section 422 and the question. You need to remember this may mean where BE2 conditions exist, where there is a risk of fire due to processed or stored materials. The index will not provide the answer to this question either. However, if any questions come up in your exam to do with temperature cut-outs, now you know where the answer is
Correct Answer: C
Explanation: Page 93 - Table 43.1 - Linked to 434.5.2 Page 92 - When you see a question with the above formula shown, or a question phrased about cables protected by thermoplastic, thermosetting, or mineral insulation, quoting conductor materials such as copper, or aluminium, you should be looking at regulation 434.5.2 and Table 43.1 (P92-P93) To answer this type of question we first need to select the correct insulation material e.g. 'thermoplastic, so we have four possible columns to select. Now we are informed, the insulation is 90℃ thermoplastic, so we are now restricted to using just the first two data columns. Next, the conductor size is less than 300 mm², so this means you must use the first data column. Next, the initial temperature is 90℃ and the final temperature is 160℃, so this again confirms we are using the first data column, we cross-reference this with the conductor material e.g. 'Copper' and you will find the k value = 100
Explanation: Page 93 - Table 43.1 - Linked to 434.5.2 Page 92 - When you see a question with the above formula shown, or a question phrased about cables protected by thermoplastic, thermosetting, or mineral insulation, quoting conductor materials such as copper, or aluminium, you should be looking at regulation 434.5.2 and Table 43.1 (P92-P93) To answer this type of question we first need to select the correct insulation material e.g. 'thermoplastic, so we have four possible columns to select. Now we are informed, the insulation is 90℃ thermoplastic, so we are now restricted to using just the first two data columns. Next, the conductor size is less than 300 mm², so this means you must use the first data column. Next, the initial temperature is 90℃ and the final temperature is 160℃, so this again confirms we are using the first data column, we cross-reference this with the conductor material e.g. 'Copper' and you will find the k value = 100
B
C
D
Correct Answer: A
Explanation: Page 219 - 559.3.3 - The part 5 contents page (P125) indicates section 559 refers to 'Luminaires and lighting installations' - you will find section 559 on page 218, on the next page in 559.3.3 you will find the answer
Explanation: Page 219 - 559.3.3 - The part 5 contents page (P125) indicates section 559 refers to 'Luminaires and lighting installations' - you will find section 559 on page 218, on the next page in 559.3.3 you will find the answer
46. Where identification of individual conductors is made by use of numerals, what colour ratio is permitted for the identification?
Mark one answer
B
C
D
Correct Answer: B
Explanation: Page 130 - 514.5.1 - The part 5 contents page (P124) indicates section 514 refers to 'Identification notices' Section 514 starts on page 129, you need to skim the section looking for 'Identification of conductors' which you will find on page 130 - 514.5.1 provides the answer. Here we are informed, all numerals shall be in strong contrast to the colours of the insulation, and below you can see an acceptable example, with Black numerals on a White background, all the other answer options do not provide a strong contrasting background.
Explanation: Page 130 - 514.5.1 - The part 5 contents page (P124) indicates section 514 refers to 'Identification notices' Section 514 starts on page 129, you need to skim the section looking for 'Identification of conductors' which you will find on page 130 - 514.5.1 provides the answer. Here we are informed, all numerals shall be in strong contrast to the colours of the insulation, and below you can see an acceptable example, with Black numerals on a White background, all the other answer options do not provide a strong contrasting background.
47. A generating set is to run in parallel with the public supply system, which of the following factors need NOT be taken into consideration?
Mark one answer
B
C
D
Correct Answer: A
Explanation: Page 209 - 551.7.3 - The part 5 contents page (P124) indicates 'Low voltage generating sets' can be found in section 551. We can make use of the Chapter 55 contents page (P204) where 551.7 refers to 'Additional requirements for installations …..' so start here. Section 551.7 starts on page 209 and in 551.7.3 you will find Earth fault loop impedance is NOT listed
Explanation: Page 209 - 551.7.3 - The part 5 contents page (P124) indicates 'Low voltage generating sets' can be found in section 551. We can make use of the Chapter 55 contents page (P204) where 551.7 refers to 'Additional requirements for installations …..' so start here. Section 551.7 starts on page 209 and in 551.7.3 you will find Earth fault loop impedance is NOT listed
48. Where water may collect or condensation may form in a wiring system, provision shall be made for?
Mark one answer
B
C
D
Correct Answer: B
Explanation: Page 138 - 522.3.2 - The part 5 contents page (P124) indicates section 522 refers to the 'Selection and erection of wiring systems in relation to external influences' You need to realise that anything that can damage a wiring system is considered an 'External Influence'. you will find section 522 on page 138 at the bottom of the page you will find 522.3.2 and the answer
Explanation: Page 138 - 522.3.2 - The part 5 contents page (P124) indicates section 522 refers to the 'Selection and erection of wiring systems in relation to external influences' You need to realise that anything that can damage a wiring system is considered an 'External Influence'. you will find section 522 on page 138 at the bottom of the page you will find 522.3.2 and the answer
49. What specific function can an electrical device provide, if the symbol shown below is marked on the device?
Mark one answer
B
C
D
Correct Answer: D
Explanation: Page 182 - Table 537.4 - The part 5 contents page (P124) indicates section 537 refers to 'Isolation and switching' so we will start here. You need to remember Table 537.4 on page 181 - This table lists devices that can be used for Isolation, Emergency, and Functional switching. At the bottom of the table (P182) you will find the above symbol which if present on a device indicates the device is suitable for isolation purposes. Note the small numerals in this area of the table if present on a device indicate what type of switching or isolation may be used, e.g. the numeral (3) on a device indicates it is suitable for on-load isolation i.e. disconnection whilst carrying a load current
Explanation: Page 182 - Table 537.4 - The part 5 contents page (P124) indicates section 537 refers to 'Isolation and switching' so we will start here. You need to remember Table 537.4 on page 181 - This table lists devices that can be used for Isolation, Emergency, and Functional switching. At the bottom of the table (P182) you will find the above symbol which if present on a device indicates the device is suitable for isolation purposes. Note the small numerals in this area of the table if present on a device indicate what type of switching or isolation may be used, e.g. the numeral (3) on a device indicates it is suitable for on-load isolation i.e. disconnection whilst carrying a load current
Correct Answer: C
Explanation: Page 163 - 534.4.3.2 - Fig 534.4 - The part 5 contents page (P124) indicates section 534 refers to 'Devices for protection against overvoltage' you need to remember SPD's are devices for protection against overvoltage. you will find Fig 534.4 on page 163 and the answer is surge protection
Explanation: Page 163 - 534.4.3.2 - Fig 534.4 - The part 5 contents page (P124) indicates section 534 refers to 'Devices for protection against overvoltage' you need to remember SPD's are devices for protection against overvoltage. you will find Fig 534.4 on page 163 and the answer is surge protection
51. What information needs to be shown on an Electrical Installation Condition Report notification label?
Mark one answer
B
C
D
Correct Answer: A
Explanation: Page 132 - 514.12.1 - The part 5 contents page (P124) indicates section 514 refers to 'Identification and notices' Turning to this section you will find the answer on page 132 514.12.1. This is a part 5 question, and the answer is given on the label on page 132, you need the date of the last inspection and recommended date of the next inspection
Explanation: Page 132 - 514.12.1 - The part 5 contents page (P124) indicates section 514 refers to 'Identification and notices' Turning to this section you will find the answer on page 132 514.12.1. This is a part 5 question, and the answer is given on the label on page 132, you need the date of the last inspection and recommended date of the next inspection
Correct Answer: C
Explanation: Page 197 - Table 54.3 - Linked with 543.1.3 (P196) - The first thing you have to do is to obtain the k value from the Tables on page 197. You are informed the cpc i.e. protective conductor is made of 'Copper' with 70℃ thermoplastic insulation, and is part of a multicore cable. This means you must use Table 54.3, the other tables are for when the protective conductor is either 'Single-core (T 54.2) or 'Armoured' (T 54.4) or 'Steel conduit, ducting, or trunking' is used as the protective conductor (T 54.5)
Cross-referencing Table 54.3 you will find for 'Copper' conductors with 70℃ thermoplastic insulation the k factor is 115 (103* refers to conductors above 300 mm²)
You will need to use the adiabatic equation given in regulation 543.1.3 on page 196 as shown below.
Where:
S = The cross-sectional area of the protective conductor you need to calculate
I = The value of the fault current
t = The operating time of the protective device in seconds
k = The factor value which takes into account resistivity, temperature coefficient, and the heat capacity of the conductor material, linked with the initial and final conductor temperature.
We now have the following information
k value = 115 (found in table 54.3)
I = 600 amps (given in the question)
t = 0.1 seconds (given in the question)
We place these values in the adiabatic equation as follows
The minimum acceptable size of protective conductor would be 1.649 mm² however since we are not given this value in the four possible answers the next size up 2.5 mm² is the correct answer
Tip:
To enter the above equation in a Casio FX series calculator, proceed as follows:
Place the calculator in MATH mode by entering the following keys
The calculator will now show the MATH symbol on the upper status line
To enter the next sequence, you will need to use the down-arrow key this is found on the four-way cursor key
Now enter the following sequence
Press the equals key the calculator may display
press the S to D key the calculator will display 1.6498
Explanation: Page 197 - Table 54.3 - Linked with 543.1.3 (P196) - The first thing you have to do is to obtain the k value from the Tables on page 197. You are informed the cpc i.e. protective conductor is made of 'Copper' with 70℃ thermoplastic insulation, and is part of a multicore cable. This means you must use Table 54.3, the other tables are for when the protective conductor is either 'Single-core (T 54.2) or 'Armoured' (T 54.4) or 'Steel conduit, ducting, or trunking' is used as the protective conductor (T 54.5)
Cross-referencing Table 54.3 you will find for 'Copper' conductors with 70℃ thermoplastic insulation the k factor is 115 (103* refers to conductors above 300 mm²)
You will need to use the adiabatic equation given in regulation 543.1.3 on page 196 as shown below.
Where:
S = The cross-sectional area of the protective conductor you need to calculate
I = The value of the fault current
t = The operating time of the protective device in seconds
k = The factor value which takes into account resistivity, temperature coefficient, and the heat capacity of the conductor material, linked with the initial and final conductor temperature.
We now have the following information
k value = 115 (found in table 54.3)
I = 600 amps (given in the question)
t = 0.1 seconds (given in the question)
We place these values in the adiabatic equation as follows
The minimum acceptable size of protective conductor would be 1.649 mm² however since we are not given this value in the four possible answers the next size up 2.5 mm² is the correct answer
Tip:
To enter the above equation in a Casio FX series calculator, proceed as follows:
Place the calculator in MATH mode by entering the following keys
The calculator will now show the MATH symbol on the upper status line
To enter the next sequence, you will need to use the down-arrow key this is found on the four-way cursor key
Now enter the following sequence
Press the equals key the calculator may display
press the S to D key the calculator will display 1.6498
Correct Answer: C
Explanation: Page 22 - 134.1.3 - The Part 1 contents page (P14) indicates chapter 134 refers to 'Erection and initial verification of electrical installations' - This is not much use in helping you will find the answer to this question. If you use the Index, page 530 'Conductor - identification' will direct you to section 514, since this is one of the four available answers, this would be a good option to select
Explanation: Page 22 - 134.1.3 - The Part 1 contents page (P14) indicates chapter 134 refers to 'Erection and initial verification of electrical installations' - This is not much use in helping you will find the answer to this question. If you use the Index, page 530 'Conductor - identification' will direct you to section 514, since this is one of the four available answers, this would be a good option to select
B
C
D
Correct Answer: D
Explanation: Page 16 - 110.1.3 (vii) - With this type of question when the words "BS 7671 may need to be supplemented", you need to make a mental note to check Part 1 - Scope - 110.1.3 here you will find the answer 110.1.3 (vii)
Explanation: Page 16 - 110.1.3 (vii) - With this type of question when the words "BS 7671 may need to be supplemented", you need to make a mental note to check Part 1 - Scope - 110.1.3 here you will find the answer 110.1.3 (vii)
Correct Answer: C
Explanation: Page 15 - 110.1.2 (iii) - You won't find any guidance to this answer in the Part 1 contents page, nor in the Index. Try to remember 110.1.2 advises what is 'included' in BS 7671, and 110.2 (P16) advises what is 'excluded'
Explanation: Page 15 - 110.1.2 (iii) - You won't find any guidance to this answer in the Part 1 contents page, nor in the Index. Try to remember 110.1.2 advises what is 'included' in BS 7671, and 110.2 (P16) advises what is 'excluded'
Correct Answer: B
Explanation: Page 16 - 114.1 - You shouldn't need to look in the reg's for this answer.
If you didn't know where to look for the answer, then always check out the contents page for the relevant part of the reg's you are answering, and if there is no obvious pointer to an answer then look in the index section. In this question the Part 1 contents page indicates section 114 relates to 'Relationship with statutory regulations'
Tip: Remember if you cannot find a particular entry usually in the Contents or Index section, for example 'Initial Verification' look to see if the reverse text exists e.g. 'Verification Initial' you will then often find the solution you are seeking
Explanation: Page 16 - 114.1 - You shouldn't need to look in the reg's for this answer.
If you didn't know where to look for the answer, then always check out the contents page for the relevant part of the reg's you are answering, and if there is no obvious pointer to an answer then look in the index section. In this question the Part 1 contents page indicates section 114 relates to 'Relationship with statutory regulations'
Tip: Remember if you cannot find a particular entry usually in the Contents or Index section, for example 'Initial Verification' look to see if the reverse text exists e.g. 'Verification Initial' you will then often find the solution you are seeking
57. What is this statement a definition of: 'Protection against electric shock under fault-free conditions?
Mark one answer
B
C
D
Correct Answer: A
Explanation: Page 24 - Definitions - Basic protection - The Definitions Part does include references to deleted definitions, such as 'direct contact'. Basic protection has replaced this term. You should try to remember the definitions for basic and fault protection, as they often come up in the exam, if you selected 'Direct Contact' you would not achieve any marks
Explanation: Page 24 - Definitions - Basic protection - The Definitions Part does include references to deleted definitions, such as 'direct contact'. Basic protection has replaced this term. You should try to remember the definitions for basic and fault protection, as they often come up in the exam, if you selected 'Direct Contact' you would not achieve any marks
Correct Answer: A
Explanation: Page 41 - Symbols - When symbols such as Zx are used in the regulations, they inform you where the symbol is used for the first time. In the case of Zx, it is in Appendix 13, section 2
Explanation: Page 41 - Symbols - When symbols such as Zx are used in the regulations, they inform you where the symbol is used for the first time. In the case of Zx, it is in Appendix 13, section 2
B
C
D
Correct Answer: B
Explanation: Page 49 - 313.1 - The current-carrying capacities of the cables is not a required characteristic. This is one of those 'Reverse' questions. The 'key' to locating this answer is the term 'the general supply characteristics' The part 3 contents page (P44) indicates section 313.1 refers to 'Supplies - General' so this is where you should start looking. For those readers who may think the current-carrying capacity of cables is a potential answer, it would be if this was an appendix question, but it is a part 3 general supply characteristic question. Don't make the mistake of trying to answer a question from one part of the reg's, with what appears to be a suitable answer from another part
Explanation: Page 49 - 313.1 - The current-carrying capacities of the cables is not a required characteristic. This is one of those 'Reverse' questions. The 'key' to locating this answer is the term 'the general supply characteristics' The part 3 contents page (P44) indicates section 313.1 refers to 'Supplies - General' so this is where you should start looking. For those readers who may think the current-carrying capacity of cables is a potential answer, it would be if this was an appendix question, but it is a part 3 general supply characteristic question. Don't make the mistake of trying to answer a question from one part of the reg's, with what appears to be a suitable answer from another part
Correct Answer: C
Explanation: Page 51 - 332.1 - The part 3 contents page (P44) indicates section 332 refers to 'Electromagnetic Compatibility' browsing to this section on page 51 you will find the answer in 332.1
Explanation: Page 51 - 332.1 - The part 3 contents page (P44) indicates section 332 refers to 'Electromagnetic Compatibility' browsing to this section on page 51 you will find the answer in 332.1