Q) . Where a clamp is used for bonding-purposes . a permanent label shall befixed in a visible position with the wording ? A) . “ Safety-Electrical-Connection “ Do Not Remove . 514.13.1 .p.118 . ( EICR -. C2 . C3 . ??? )
Q) . where it is necessary to limit the consequences of the risk of fire due tofault-currents . which of the following RCDs is used ? A) . RCD with operating-current notexceeding 300mA Q) . What is the maximum operating current for an RCD which may supply portableequipment used outdoors . ? A) . 30mA . p.54 . 411.3.3. (ii) Q) . Every electrical installations shall be divided into circuits to . asnecessary to . ? A) . facilitate safe inspection . testingand maintenance . p.46 . 314.1 . ( ii ) Q) An overload protective device installed at the origin of a circuit must havea breaking capacity of . ? A) . equivalent or more that the prospective-short-circuit-current . Q) The maximum disconnection time for a 230V a.c. final-circuit not exceeding32A . with a TT - supply . ? A) . 0.2 seconds . p.53 . Table - 41.1 Q) In a TT- system . automatic-disconnection of the supply in case of a fault ina 230V a.c. final-circuit not exceeding 32A . ? A) . 0.2 seconds . p.53 . Table - 41.1 Q) . In a TN-S system . the maximum-earth-fault-loop-impedance ( Zs ) when using a 32A . type B circuit-breaker instantaneous-operation would be . ? A) . 1.44Ω . p.56. Table - 41.3.
Chapter- 51 510.2. Every item of equipment shall be selected anderected so as to allow for compliance with the regulations in this chapterand other-parts of BS-7671: andManufactures-Instructions .
Q) . A copy of the distribution-board-schedule shall be located with ? A) . The distribution-board . p.117 .514.9. Section514 . Identification and Notices . 514.8.Identification of protective-device . Circuit-protective-devices arerequired to be arranged and identified so that the circuit-protected may beeasily-recognised . 514.9.Diagrams . A legible diagram . chart or table . or equivalent form ofinformation . must be provided indicating a range of information . Q). State . the items that should be included in a distribution chart to meet theabove requirements - 514.9. Forsimple-installations the information may be given in a . Schedule ( Schedule ofcircuit-details for the installation ) . a durable-copy of which relating tothe distribution-board . shall beprovided within or adjacent to each distribution-board .
514.13.Warning notices . Earthing and bonding-connections . 514.13.1. A durable-label to BS-951 with the words “Safety-Electrical-Connection “ Do Not Remove . shall be permanently fixed in avisible-position at or near . i)the point of connection of every earthing-conductor to an . earth-electrode . ii)the point of connection of every bonding-conductor to an .extraneous-conductive-part iii)the main-earth-terminal . where separate from main-switchgear .
2394: Q ) . Defects identified during aninitial-verification should be ? thisone always comes up . A) . Made good before the certificate is issued .
Regulation(s), Initial - Verification . p.196 632.4. Defects or omissions revealed during .inspection & testing of theinstallation-work covered by the ( Certificate ) shall be made good before the Certificate is issued .
Q) . An electrical-installation-certificate . must indicate responsibility forthe installation(s) . A ) . Design . construction . testing & testing. p.389 . (v) ( EIC ) will indicate the responsibility for . design.construction . inspection & testing . whether in relation to new-work . or further-work . on an existing-installation .
Where. design . construction . inspection & testing are the responsibility of one-person a .Certificate with a ( single-signature ) declaration . Etc .
The only safe-method ofIsolation is by means of an . Individual-locking-device . the system you working on cannot be .energised without the removal of the locking-device .
p.29 . Isolation isdefined as
2394: afunction intended to cut-off for reasons of safety the supply from all . or a discrete-section . of the installation byseparating the installation or section from every-source of . electrical-energy.
Useful-junk
A “ Volt-stick “ is not-considered to be used forsafe-isolation-procedures and can only be . considered to be an ( Indicator that voltage ispresent )
Q) reasons for testing an electrical-installation.
Q) Perform avisual-inspection of any domestic-installation(s) . Visual-inspection shouldprecede testing . Reason : Prior to theInstallation being made-live . it is necessary to inspect any part of theinstallation during construction . as these parts . 2394 . in our case . willbe concealed .
Can I carry out analteration or addition to an existing-installation that has inadequate-earthing and / or bonding-arrangements .
No - Any alteration oraddition to an existing-installation must comply with the current-edition ofBS-7671: including any amendments . This requires any earthing and bonding-arrangements. upon which the alteration or addition relies for safety to be adequate .
Periodic-Inspection andTesting . ( Careful-scrutiny backed up by testing )
Scenario : a) . What types ofInspection and Tests . need to be carried-out . Initial-verification for New-work . and Periodic-inspectionand test for the . Existing-installation .
b) Sate : the documentthat should be completed and why an Electrical-Installation-Certificate for new-work . Additional-circuitshave been installed and a . Periodic-Inspection for the Existing-installation . ( EICR )
Both of these documentsmust be accompanied with a . Schedule of Inspection and a Schedule oftest-results .
Re-call . p.389 . vii ) An ( EICR ) willindicate the responsibility for the inspection and testing of an . Existing-installation . within the extentand limitations specified on the report .
viii) Schedules of inspection and Schedules oftest-results as required by part - 6 should be issued with the associated .Electrical-Installation-Certificate . or Electrical-Installation-Condition-Report .
Re-call . p.389 . Electrical-Installation-Certificateswill indicate the responsibility for design . construction . inspection andtesting . whether in relation to ( New-work ) or further-work on an .existing-installation .
viii) Schedules of inspection and Schedules oftest-results as required by part - 6 should be issued with the associated . Electrical-Installation-Certificate . or Electrical-Installation-Condition-Report.
Periodic-Inspection . Q). if no documentation is available for the installation what action is required. some exploratory-work . to establishthe criteria .
An Inspection and Testis to be conducted on a new-installation . 2394: State : a) the type ofverification to be carried out . b) the documentationthat will need to be completed .
a) Initial-verification. b)Electrical-Installation-certificate . ( EIC )
* i) Electrical-Installation-Certificate .ii) Schedule of test-results . iii) Schedule of inspection .
a) . if the Ring-final-circuit( R[SUP]1[/SUP] + R[SUP]2[/SUP] ) is0.72Ω . calculate the approximate-reading of ( Zs ) Zs = Ze + ( R[SUP]1[/SUP] + R[SUP]2[/SUP] ) = 0.2 + 0.72 = 0.92Ω .
b) . if themaximum-tabulated ( Zs ) for this circuit is ( 1.2Ω ) calculate if the reading in ( a ) isacceptable .
there are nocorrection-factors stated . use the rule of thumb . 1.2 x 0.75= 0.9Ω < 0.92Ω measured . ( Circuit-fails )
c) . State : whatfactors need to be considered before measured .earth-loop-impedance-values are comparedagainst maximum-tabulated ( Zs ) values . i) .Ambient-temperature-factors . when not measured at 20°C . ii) .Cable-temperature-factors . not at its operating-temperature .
Record the Test-results.
Ring-Final-Circuit -conductor . 2.5mm[SUP]2[/SUP] T&E cable has a 1.5mm[SUP]2[/SUP] protective-conductor . In this case multiplythe résistance of the . Line or Neutral-conductor . by a factor of ( 1.67 ) tocross-check the . protective-conductor-readings - 2.5 ÷ 1.5 = 1.67 .
Knowledge ofFundamental-initial-verification . Some handy - revision .
By definition p.29 : Inspection Examination of an electrical-installation. using all the ( Senses as appropriate )
Q ) . Overloaded-windson a . 3-phase-motor may be identified in the first-instance by ? A) . Smell . Sight . Touch . Taste .
Q ) . Anearly-indication of an . overloaded-circuit could be found by ? A) . Using-senses . Continuity-test . An insulation-résistance-test. Anearth-fault-loop-impedance-tester.
Q ) . When diagnosingand locating a . loose-connection the most-effective-sense to use would be ? A) . Touch . Smell . Taste . Hearing .
2394: Q) . The safest-methodof making sure an installation is safe to work on would be ? A) . To follow thesafe-isolation-procedure .
Q) . During an external-loop-impedance-test. the main-earthing-conductor should be ? GN-3 p.53 A) . Disconnected . ( No-Parallel-path )
Q) . An earth-fault-loop-impedance-tester. should only allow-current to flow for . ? GN-3 . p83 / 4.5 A) . 40mS .
Q) . An installationhas a . prospective-fault-current-measured at ( 2.3kA ) and a .prospective-short-circuit-current-measured at ( 2.5kA ) The value that should .be recorded would be ? A) . The highest .
Q) . Whentwo-bonding-conductors of equal-length .are connected in parallel the résistance would . ? A) . Halve . Increase. Decrease. Double .
Q) . if the . C.S.A. ofa protective-conductor increases . ? A) . Résistance-decreases. Résistance-increases. The ( Zs ) readings-increases. Résistance reminds thesame .
Q) . The frequency of .periodic-inspections should be determined by : the type and use of installation. the frequency of maintenance and . ? A) . Theexternal-influences to which the . the installation is subjected . p.393 / Part - 3 . Essential-Tests . Q) . Aminor-work-certificate it is not . necessary to record . ? A) . ( Ze ) Zs . RCD-operation . Installation-résistance.
Zs ) . 612.9.Earth-fault-loop-impedance . (Circuit-loop-impedance ) Where protective-measuresare used which require a . knowledge of earth-fault-loop-impedance . therelevant-impedances shall be measured . 2394:
Q) . A minor-work-certificateshall be issued where . ? A) . An alterationnot-requiring an . additional-circuit is needed .
Q) . it is important to. test an installation in the . correct-sequence-because . ? A) . Each-test-relies .on the previous to be correct .
Using the wife’sglasses . sorry Q) . Aminor-work-certificate it is not . necessary to record . ? p.393 / Part - 3 .Essential-Tests . A) . ( Ze ) Zs . RCD-operation . Installation-résistance.
Q) . Theprospective-fault-current at the . origin of an electrical-installation must betaken into account when ? A) . Selecting the typeof . overcurrent-device to be installed . Assessing theearthing-arrangement . Applying-diversity tothe installation . Estimating the .external-earth-fault-loop-impedance .
Q) . it is a good-ideawhen performing an . insulation-résistance-test on a large-installation . tosubdivide-circuits to avoid ? A) . False-readingsfrom . parallel-paths .
Q ) . Overloaded-windings on a .3-phase-motor may be identified in the first-instance by ? A) . Smell . Sight . Touch . Taste .
Q ) . Thenon-statutory-document-concerning the care and use of test-instruments . leadsand probes would by ? A) . Guidance - Note .GS-38. ( H&S Guidance-note - GS-38 ) Guidance-note - 3 . BS-7671:2008:2011: The Electricity at work-regulations 1989 .
Q ) . Aninitial-verification should be carried out on ? A) . A new-installation.
Q ) . AnElectrical-installation-certificate . must indicate responsibility for the installation’s. ? A) . Design .construction . inspection & testing . of the work .
Q ) . Electrical-installation-certificate. should be signed by . A) . A competent-person.
Q ) .BS-7671:2008:2011: has a separate-section or part that is solely-designated to . inspection & testing . this documentis classed as . ? A) . Anon-statutory-document .
Q ) . Prior to performing-live-tests . &before-energising an installation . you should . ? A) .Inform-other-people in the area .
Q ) . On preparing to carry out a full-initial-verification . inspection &test on a large-office-block . which of the following items would . be unnecessary at this point . ? A) . The presence of .inducting-lighting . The nominal-voltage . The prospective-fault-current. The type & ratingof the . protective-device at the origin of the installation .
2394 : as an Inspector. Q ) . On-disassembling a ceiling-rose-during-completion. of the schedule of inspections on a ( EICR ) you note that ablue-insulated-conductor . is in the Line-terminal . even though thecircuit-work-fine . this might-fail-inspection due to . ? A) . Identification of conductors. Polarity-verification . Connection-method . Cable-routing .
Q ) . When-testing a ring-final-circuit-protected bya . BS-EN-61009-1 30mA -RCBO . with a RCD-tester at ( x5 ) it should - disconnect ?
A) . Within - 40mS . Q ) . When-testing at ( 100% ) an RCD -protected-socket-outlet to ( ►BS-7288 ) should operatewithin . ? A) . 200mS . Q ) . A . BS-EN-61009-1 30mA RCBO - tested at ( x1 / 100% )should-operate within . ? A) . 300mS . Q ) . What-type of test-instrument may give . areading such as ( 16.8mS ) A) . An RCD tester . ** . Q ) . The most-convenient-method of determining thevalue of the . ( PFC ) at the origin of an existing-installation . would be by ? A) . Measurement .
Q ) . 2394: After wiring an additional-light-fitting. into a new-conservatory by extending from an ( Existing-circuit ) on completion you should -issue . ? ( MEIEC ) Minor-electrical-installation-works-certificate. ( EIC )Electrical-installation-certificate . ( EICR ) Electrical-installation-condition-report. Building-control-notification.
Q ) . Before commencingthe . inspection and testing of a new-installation . the information you shouldhave available would be . ? The . Maximum-earth-fault-loop-impedance. values The . Earthing-arrangements. ( What do we confirm first ) The . Presence ofany-surge-protective-devices The . Proximity of theDNO -supply-transformer .
Q ) . Two-ways in whichan electric-shock could-occur are . ? Direct andfault-contact A) . Basic andfault-contact Direct andbasic-contact Basic and earth-contact.
Q ) . Before commencingthe . inspection and testing of a new-installation . the information you shouldhave available would be . ? The .Earth-fault-loop-impedance The . Insulation-résistance-readings for the installation The . External-loop-impedance. ( Do we have an Earth ) The ( R[SUP]1[/SUP] + R[SUP]2[/SUP] ) values of each-individual-sub-main
Q ) . When-performingan . earth-electrode-test . the most-reliable-results . would be when the . distance between the earth-electrodeand the current-spike is . ? At least ( 5 - times )the maximum-dimension of the electrode-system At least ( 10 - times )the maximum-dimension of the electrode-system GN-3 . p.49 . is at least - ten-times . Between . 2 and 5m away . Within 2 metres of each-other .
Q ) . During acontinuity of . ring-final-conductors-test . 10-sockets give a ( R[SUP]1[/SUP] + R[SUP]2[/SUP] ) reading of ( 0.68Ω ) but one-socket gives a reading of ( 0.92Ω ) this could . indicate . ? Short-circuit . High-résistance-fault . Missing-earth-connection. Spur on the circuit . ( What would give you a higherreading ) indicating a - Spur . ( 0.92Ω )
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