Rebuild1 – New 2391-52-maybe

Why is periodic inspection and testing undertaken?(QID:11349)

To provide proof that an alteration to an installation complies with current regulations
To provide an engineering view that the installation was constructed correctly
To provide proof that all additions to the installation comply with current regulations
To provide an engineering view that an installation can continue to be used safely

What is the most suitable document to be issued by an inspector following the installation of an additional outdoor socket-outlet supplied from an existing ring-final circuit?(QID:11351)

Electrical Installation Certificate
Building Controls Certification to Part P
Electrical Installation Condition Report
Minor Electrical Installation Works Certificate

How regularly must an Approved Voltage Indicator, used to check safe isolation, be checked for operation?(QID:11354)

Every week
Every three months
Every twelve months
Every time it is used

What should be undertaken if a Main Protective Bonding Conductor cannot be seen throughout its length?(QID:11355)

It should be noted as a limitation on the test sheet and not tested
It should be pulled to check for breaks
It should be exposed to see it throughout
It should be tested for continuity

What would be checked by visual inspection to verify that Additional Protection is suitably provided by an RCD?(QID:11356)

That the l_ΔN does not exceed 300 mA
That the l_ΔN does not exceed 150 mA
That the l_ΔN does not exceed 100 mA
That the l_ΔN does not exceed 30 mA

When is it acceptable to insert a cross against any item in Section 2 of a schedule of inspections for new works?(QID:11357)

Where an installation earth electrode is corroded
When the Earthing Conductor is under-sized
Should an item listed be not applicable
Under no circumstances, as all must comply

What classification code would be used when discovering a severely damaged socket-outlet during a periodic inspection?(QID:11361)

C2
C3
F1
C1

Why does continuity testing precede insulation resistance when conducting initial verification?(QID:11369)

To ensure conductors are sufficiently insulated before using high voltages
To ensure the cpc is present to protect persons during high voltage testing
To ensure all protective devices will trip should a short circuit be revealed
To ensure conductors are continuous before testing between them

Why is a set test sequence not required when testing existing installations having reliable test records?(QID:11370)

Circuits have been working so no faults are possible
Previous test data shows that no faults are present
Dead tests are only required to confirm compliance
Tests can be arranged to minimise disturbance

What test voltage is used when testing the separation of circuits between the supply and load conductors at the point where a SELV transformer would be connected?(QID:11372)

50 V
250V
1000 V
500 V

What document must be issued following the installation of a new cooker circuit to an existing installation(QID:11423)

Electrical Installation Report
Electrical Installation Condition Report
Minor Electrical Installation Works Certificate
Electrical Installation Certificate

What circumstance would require an Electrical Installation Condition Report to be issued(QID:11424)

New luminaires have been installed
Supermarket has been rewired
Remedial work has been carried out
New occupier moving into a flat

The measured R₁+R₂ value for a radial cooker circuit, with a 6 mm² line conductor and a 2.5 mm² cpc, is 0.29 Ω. What is the length of this circuit?(QID:11425)

23 m
33 m
38 m
28 m

What is the purpose of an initial verification?(QID:11300)

To provide a detailed report on the condition of the installation and check for signs of deterioration
To ensure the requirements of the Electricity at Work Regulations have been met
To provide an engineering view, so far as reasonably practical, that the requirements of GN3 are met
To check that the installation complies, so far as reasonably practicable, with BS 7671

Which non-statutory document contains specific detail relating to the methods of testing during an initial verification?(QID:11301)

BS 7671
IET GN8
HSE GS38
IET GN3

What information must an inspector have, which relates to diagrams, charts or tables?(QID:11302)

The maximum demand after the application of diversity
The nature of the supply current and frequency
The number and type of live supply conductors
The type and composition of each circuit

How is the risk of the inspector receiving an electric shock minimised whilst working on an isolated circuit?(QID:11304)

Placing warning notices on the isolated circuit breaker
Placing insulation tape over the isolated circuit breaker
Locking off the circuit with a lock having multiple keys
Locking off the circuit with a lock having a unique key

What is the level of risk if a Main Protective Bonding conductor, to a metallic water pipe, is disconnected from the MET when the supply is not isolated?(QID:11305)

There is no risk as the metallic pipework is never live
There is a risk of shock as the water pipe is always live
There is no risk as the water pipe and electrical earth are always at an equal potential
There is a risk of shock as the water pipe may be a different potential to the electrical earth

Why is the inspection carried out before any testing?(QID:11306)

To ensure the installation is complete which minimises the tests required
To ensure the visible parts are safe meaning they will not need testing
To ensure that visible covers are removed allowing easy testing
To ensure the installation is complete and is safe to begin testing

What would be inspected when the basic protection by barriers and enclosures is being verified on a three-phase distribution board?(QID:11307)

RCBO ratings
Terminations
Resistance of CPC
IP ratings

What would be verified by inspection where additional protection is provided on a circuit concealed in walls at a depth less than 50 mm?(QID:11308)

RCD exceeds 30 mA
Supplementary bonding present
MCB is rated at 32A
RCD not exceeding 30 mA

What would be verified using only the human sense of sight?(QID:11309)

Equipment is securely fixed
Equipment terminations are tight
Cable glands are tight and securely fitted
Cables and terminals are correctly identified

What is the minimum permitted level of IP protection for a metal trunking housing non-sheathed cable?(QID:11311)

IPX2
IP45
IPX4
IP4X

What would an inspector be looking for when verifying that a new machine in a workshop has adequate undervoltage protection?(QID:11312)

The presence of emergency stop buttons
The presence of Additional Protection
The presence surge-protective devices
The presence of a Direct Online Starter (DOL)/contactor

What must happen if a test instrument is found to be inaccurate?(QID:11313)

The holder of each certificate issued in the past year must be told their installation is in an unsafe condition
The instrument should be calibrated but previous initial verifications need not be retested
The certification issued since the last accuracy check must be submitted to the HSE for inspection
The tests where the instrument was used since the last instrument check must be sampled for accuracy

What must be done with a low resistance ohmmeter to ensure accurate results are obtained each time it is used?(QID:11314)

Calibration
Battery replacement
Test on known supply
Lead zeroing

What does GS38 require?(QID:11315)

Test leads must not be detachable
Test leads must be coloured brown
Test leads must have 6 mm exposed tip
Test leads must have finger guards fitted

Why should a continuity test be carried out first on a circuit?(QID:11317)

To confirm neutral conductors are being switched on single-pole devices
To verify that all switches are in the live conductors before a polarity test verifies this
To verify all cpc conductors have a suitable earth fault loop, before a voltage drop test
To check the cable conductors are continuous before checking the insulation between them

What would be the maximum expected value of Ze on an installation forming part of a TNCS system?(QID:11319)

0.15 Ω
0.80 Ω
0.4 Ω
0.35 Ω

Which factor directly affects voltage drop?(QID:11322)

Protective device rating
Number of switches used
Length of the Earthing conductor
Circuit load current

What would be a common reason for a Local Authority requiring a periodic inspection and test to be carried out on a private building?(QID:11323)

Insurance renewal
Mortgage renewal
Mortgage application
Building is a licenced premise

Which statutory document relates to the periodic inspection and testing process?(QID:11324)

BS 7671 : IET Wiring Regulations
HSE GS38: Test Instruments & Leads
IET GN3: Inspection and Testing
Electricity at Work Regulations

What factor could have an impact on the limitations agreed with a client?(QID:11326)

The sections of the building the client occupies
The ability to access rooms at particular times
The number of distribution circuits present
The loss of supply to an essential data system

What is a major responsibility of an inspector, based on the overall condition of an installation, following a periodic inspection?(QID:11327)

Ensuring all minor works are completed
Issuing certification to the Local Authority
Sending a general report to the DNO
Setting the period to the next test date

What does the Electricity at Work Regulations state, with regard to, working on or near live parts?(QID:11328)

It is permitted if the building is occupied during the works
Under no circumstances should this be undertaken
Those undertaking the work shall have notified the HSE in advance
Suitable precautions must be taken to prevent injury

A large installation is being inspected by four persons and the supply has been isolated. How should the means of isolation be secured?(QID:11329)

By using four notices on the installation main switch
By using a device that accepts one lock having four keys
By using four different colours of tape over the main switch
By using a device that accepts four locks having unique keys

What is the minimum level of IP protection, for Basic Protection, when inspecting the accessible horizontal top surface of a distribution board?(QID:11330)

No minimum rating
IP45
IPX4
IP4X

One item on an Inspection Schedule requires the segregation of Band I and Band II cables. What is a typical example of a Band I cable?(QID:11331)

The cable supplying a SELV lighting transformer
A sub-feed to from a 3-phase distribution board
A cable supplying a 16 A BS EN 60309 socket-outlet
A cable linking detectors on an intruder alarm system

What is an example of a defect which is classified C1?(QID:11332)

A missing lid on trunking containing sheathed cables
A circuit supplying a bathroom having no RCD protection
A 1.5 mm² cable protected by a 20 A circuit breaker
A light switch having a damaged front exposing internal parts

Which defect would be detected by the sense of hearing?(QID:11333)

Damaged cable insulation
Inadequate conduit fixings
Faulty bonding conductor
Loose Neutral connection

What is the maximum residual current setting for an RCD providing fault protection only?(QID:11334)

30 mA as stated under Additional Protection
100 mA when the RCD is a main switch
It depends on the current rating of the circuit breaker
It depends on the value of earth fault loop impedance

What does the second number of an IP code relate to?(QID:11335)

Ingress of dust
Ingress of fingers
Ingress of solid objects
Ingress of water or moisture

What is required following the issue of an F1 code?(QID:11336)

Fault identified must be rectified immediately
Further insulation must be applied imminently
Faulty installation must be isolated instantly
Further investigation required without delay

When testing a 230 V circuit using 500 V which display would represent a suitable insulation resistance value when the instrument is set to MΩ?(QID:11338)

Wait until it is tested to see if it is safe
Note it on the certificate as a defect
Give it a C1 code and issue a certificate to the designer
Ensure the defect is remedied before an EIC is issued.

What circumstances would remove the need for a ring-final continuity test during periodic testing?(QID:11339)

Where no records exist and the circuit has not been altered
Where the circuit is protected by an RCD but no records exist
Where older records exist and the circuit has been altered
Where records exist and no alterations have been done

What would most likely influence instrument accuracy, leading to more frequent checks being needed?(QID:11340)

Storing in dry site store with a constant temperature
Using the test instruments on very rare occasions
Storing it in an office cupboard and not using it often
Keeping it in a van with many other tools and equipment

What factor would most likely lead to tests being carried out in a sequence different to initial verification?(QID:11341)

No previous test records or circuit charts present
The inspection revealed many causes for concern
There are signs of many unrecorded additional circuits
The need to isolate at times suitable to the client

What is the maximum disconnection time for an RCD to BS EN 61008 when tested at 1 x l_ΔN?(QID:11343)

40 ms
0.4 s
100 ms
300 ms

What is the maximum permitted value of measured earth fault loop impedance for a 20 A radial power final-circuit, supplied by a TN-S system, protected by a BS 88-3 system C fuse?(QID:11344)

1.75 Ω
2.24 Ω
3.20 Ω
1.93 Ω

What is the maximum permissible value of voltage drop for a 230 V power circuit?(QID:11345)

3 V
5 V
6.9 V
11.5 V

When should the integral test button on an RCD be operated during a periodic test?(QID:11346)

Before all tests
When the supply is isolated
Before the R1+R2 test
After instrument tests and when it is safe to energise

How regularly should the test button on an RCD be operated by the user of an installation?(QID:11347)

Every three days
Every three weeks
Every three years
Every six months

What is the purpose of an initial verification?(QID:11348)

To confirm the installation is defective or has not deteriorated over time
To confirm that the client is satisfied with all the work carried out
To confirm that contractual elements have been undertaken to ISO 9001
To confirm the installation complies with the design and construction parts of BS 7671

What is the responsibility of the duty-holder in the inspection and testing procedure?(QID:11353)

Manage the sequence of tests
Manage work efficiently
Manage regular calibration dates
Manage associated risks

How would a non-compliance be recorded on an inspection schedule during a periodic inspection?(QID:11358)

Lim
Cross
F1 Code
C Code

What would be verified using the sense of touch during an initial verification?(QID:11359)

Identification of conductors
Suitable size of conductors
Suitable type of conductors
Termination of conductors

What code would be given where access to a room is a limitation and the inspector suspects corrosion to a bonding clamp?(QID:11362)

C1
C2
C3
F1

What equipment IP rating is suitable for splashes of water from all direction?(QID:11363)

IPX1
IPX2
IPX3
IPX4

Where a barrier or enclosure has a rating of IP2X, what diameter of tool should not be able to penetrate that barrier/enclosure?(QID:11364)

>0.50 cm
>10 mm
>2.50 mm
>12.5 mm

What is the minimum permitted IP protection for the top surface of an accessible surface distribution board?(QID:11365)

IP3X
IP2X
IP1X
IP4X

What must be fitted to GS38 compliant test leads?(QID:11366)

Neon indicators
6 mm exposed tips
Thermal fuses
Finger guards

What is a suitable method of testing the function of an insulation resistance tester?(QID:11368)

On a known 230 V supply
Testing a known length of cable
Checking the last calibration date
Test with probes open then touching

What would be the approximate disconnection time for a 32 A Type B circuit breaker to BS EN 60898 if an earth fault loop impedance of 2.87 Ω was recorded?(QID:11373)

20 seconds
5 seconds
0.4 seconds
60 seconds

A 1.5 mm² cpc is connected to a socket-outlet and has a measured resistance of 0.8 Ω. What would be the resistance of R₂ for this circuit if another 1.5 mm² conductor, of the same length, was run and connected in parallel?(QID:11376)

1 .6 Ω
1 .2 Ω
0.8 Ω
0.4 Ω

What is the main purpose of an Initial Verification?(QID:11377)

To complete the testing and issue an Electrical Installation Certificate
To make a judgement that the installation is safe for continued use
To ensure all testing has been carried out
To confirm an installation is safe to be put into service

What situation requires the issuing of a Minor Electrical Installation Works Certificate?(QID:11378)

An additional lighting circuit has been installed
Changing a consumer unit and protective devices
Upgrading the cable and circuit breaker for a shower circuit
Additional socket-outlets added to an existing ring final circuit

Which statutory document contains specific information relevant to Initial Verification?(QID:11379)

Health and Safety guidance GS38
The Health and Safety at Work Act
BS 7671, Requirements for Electrical Installations
The Electricity at Work Regulations

What is the minimum voltage which requires the test leads and probes to comply with GS38?(QID:11380)

25 V AC
12 V AC
150 V AC
50 V AC

How many voltage measurements are required to confirm that a three-phase four-wire installation is safely isolated?(QID:11381)

3
5
9
10

What precaution is required before carrying out a test of external earth fault loop impedance (Ze) so as to avoid danger to users of an installation?(QID:11382)

Use insulated screwdrivers
Warn the occupier of the premises
Disconnect the main protective bonding conductors
Lock off the supply

Why does BS 7671 require inspection to be carried out before testing?(QID:11383)

To confirm the installers have installed as per the job specification
To confirm all the equipment is connected to the installation will work
To confirm the Earthing Conductor is connected and it is safe to commence testing
To confirm the installation is complete and it is safe to commence testing

Which situation will not require a label stating ‘Safety Electrical Connection – Do Not remove’?(QID:11384)

Connecting a bonding conductor to a metallic installation gas pipe
An Earthing conductor connected to an installation earth electrode
A supplementary bonding conductor connected to a metallic water pipe
The connection to a Main Earthing Terminal within a consumer unit

What must be checked when inspecting a consumer unit for compliance with Basic Protection requirements?(QID:11385)

All cable terminations are tight
Live conductors are correctly identified
Protective devices are the correct rating
Enclosures meet the IP requirements

Which two senses are used when inspecting the terminations at a newly installed motor?(QID:11386)

Sight and hearing
Sight and smell
Touch and smell
Touch and sight

What action must be taken when a loose connection is found to a pipe during the inspection of a main protective bonding conductor termination?(QID:11387)

A defect report must accompany the Electrical Installation Certificate
The continuity test between the MET and the pipe should be carried out.
A note is made on the Electrical Installation Certificate under ‘Departures’
The defect must be made good and inspected before certification

What best describes the protection offered by IPXXB?(QID:11388)

Protection against the ingress of solids. C
Protection against the ingress of water
Protection against impact
Protection against access to live parts

What is the minimum IP rating for electrical equipment installed in Zone 2 of a bathroom?(QID:11389)

IP 2X
IP X2
IP 4X
IP X4

What would be the correct procedure to confirm that the existing electrical installation in a dwelling is suitable for the additional wiring of an extension(QID:11401)

A visual inspection of the wiring and condition of the accessories
A full review of the original electrical installation certificate
Certification of the additional wiring on completion of the extension
A periodic inspection and test of the existing installation

What is the purpose of a periodic inspection and test relating to the safety of the building(QID:11402)

There is no risk of electric shock and burns
That the electrical installation is not damaged
That there are no defects or non-compliances present
There is no risk of fire caused by the electrical installation

What is the minimum level of IP protection for the highlighted cover of a consumer unit?(QID:11403)

IP4X
IP5X
IPX2
IP2X

What is the minimum level of IP protection for the accessible top surface of a consumer unit?(QID:11404)

IPX4
IP2X
IPX2
IP4X

Which publication gives detailed information for carrying out testing of electrical installations?(QID:11405)

HSE GS 38
IET Guidance note 1
HS(G)141
IET Guidance Note 3

What would be agreed with the client and recorded as a limitation for a periodic inspection and test(QID:11406)

The installation can be isolated and a full range of tests to be carried out
The finalised report is to be provided to the client electronically
Only calibrated test instruments are to be used
No insulation resistance testing between live conductors to be carried out

Which statutory document includes the requirements for working on live conductors?(QID:11407)

The Electricity Safety Quality and Continuity Regulations
The Construction (Design and Management) Regulations
The Health and Safety at Work Act
The Electricity at Work Regulations

What action should the inspector take, both before and after testing, to confirm isolation of the supply(QID:11408)

Switch the main isolator on and off
Lock the main switch on the open position
Attach a warning label at the isolator stating ‘do not switch on’
Confirm the operation of the approved voltage indicator

Which classification code indicates that there is a non-compliance which is identified as ‘improvement required’?(QID:11409)

C1
C2
FI
C3

Which human senses would be best used to determine excess arcing at a contactor during a walk around survey(QID:11410)

Touch and smell
Sight and hearing
Smell and sight
Hearing and smell

A 10 mm² main protective bonding conductor is 37.5 m in length. What is the expected measured resistance when testing the conductor?(QID:11411)

6.86 Ω
0.70 Ω
0.08 Ω
0.07 Ω

What is the most likely cause of the measured value being much higher than the calculated value(QID:11412)

Heavy load on the installation
Higher than normal ambient temperature
Leakage current from computer equipment
Failure to null the test leads

A distribution circuit is protected by a BS 88-3 system C fuse rated 32 A on a TN-S system. What is the maximum acceptable measured earth fault loop impedance for this circuit?(QID:11413)

To minimise the risk to the inspector and others posed by the installation work activities
To minimise the risk to the designer posed by the inspection procedure
To minimise the financial risk to the designer posed by departures revealed by the inspector
To minimise the risk to the inspector and others posed by the inspection procedure

What is confirmed by an earth fault loop impedance test on a radial power circuit(QID:11414)

The line and cpc conductors are the right csa
Fault protection is provided for the whole installation
The circuit breaker can disconnect the maximum prospective fault current
Automatic disconnection of supply will be achieved in the event of a fault

What is the maximum disconnection time for a 16 A , 230VAC final circuit on a TT installation?(QID:11415)

500 ms
300 ms
30 ms
200 ms

A radial circuit is installed using-single core cables in PVC conduit. The installation is 4 years old and there have been no alterations or additions to the radial circuit. Why would it be unnecessary to carry out a continuity of cpc for this circuit at periodic inspection and test?(QID:11417)

The circuit is installed in PVC conduit and so less likely to be damaged
Continuity tests are only necessary if the circuit is in flat profile cable
The circuit is only four years old so continuity testing is not required
Continuity of cpc can be confirmed during a test of Zs

Insulation resistance testing has been carried out on a six-way lighting distribution board and the individual circuit results are:
Lights 1: 200 Ω,
Lights 2: 50 Ω,
Lights 3: 50 Ω,
Lights 4: 169 Ω,
Lights 5: 198 Ω,
Spare.
What is the value of insulation resistance between Live and Earth for the DB with all the lighting circuits connected?(QID:11418)

50 MΩ
133 MΩ
200 MΩ
18 MΩ

What is the most appropriate classification code to be recorded if the insulation resistance for a circuit is measured at 0.90 MΩ between live conductors and Earth(QID:11419)

C1
C2
C3
F1

Which will be confirmed if the technical requirements of Parts 3 to 8 of BS 7671 are followed? (QID:11428)

Scope, object, and effects
Functional requirements
General characteristics
Fundamental principles

The calibration of an Earth Fault Loop Impedance tester reveals that the instrument is outside of specification. Regular accuracy checks on the instrument have not been carried out for six months. What immediate action must be taken by the contractor?(QID:11390)

The test leads for this instrument must be replaced
All installations tested in the last three months should be retested
All installations tested since the last calibration should be checked
The last installation tested should be retested

Why does BS 7671 give a defined sequence of tests when carrying out Initial Verification?(QID:11392)

To ensure all tests are carried out
To ensure the Schedule of Test Results is complete
To ensure live tests are carried out in the correct order
To ensure the safety of the person carrying out the tests

Which test method is used to verify that extraneous conductive parts of an installation are effectively connected to the MET?(QID:11393)

R₁+R₂ linked test
Applied voltage test
Applied current test
Long lead test

Where on a lighting circuit would a test of continuity of protective conductors be carried out?(QID:11395)

At the distribution board
At the furthest point in the circuit
At every light and each switch with a metallic plate
At every light and switch point

What would cause the value of R₂ to be higher than R₁ and Rn when carrying out step 1 of a continuity of ring-final circuit test?(QID:11396)

A spur in the ring
A connected load. C
Parallel earth paths
Smaller sized cpc

What is the test voltage for an insulation resistance test carried out on a 230 V circuit containing socket-outlets with surge protection devices which cannot be removed?(QID:11397)

100 V DC
500 V DC
1000 V DC
250 V DC

During the construction of an installation, insulation resistance tests have been carried out between live conductors and earth on four individual circuits and the L to E results are shown below. What is the expected value of insulation resistance L to E when the whole installation is tested?
1 – 120 MΩ, 2 – 120 MΩ, 3 – 130 MΩ, 4 – 150 MΩ(QID:11398)

0.03 MΩ
136.7 MΩ
520 MΩ
32.2 MΩ

A test is to be carried out to determine the external earth fault loop impedance of an installation forming part of a TN-S system. What is the maximum declared by the Distribution Network Operator for a TN-S supply(QID:11420)

0.21 Ω
0.35 Ω
21 Ω
0.8 Ω

Rebuild1 – New 2391-52-maybe

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