Re-take - Useful Information for 2394 :

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2392-10 Course unit 101 ( 2.3 )
1 : TheElectricity at Work Regulations came out in ? ( a ) 1974 ( b ) 1980 ( c ) 1989 ( d ) 1996
3 : Adverseor hazardous environments are coved in Electricity at Work Regulation ? ( a ) 4 ( b ) 6 ( c ) 8 ( d ) 10
4 : Regulation 8 of the Electricity at Work Regulations is concerned with ? (a ) Insulation , protection and placing of conductors (b ) Strength and capability of electrical equipment ( c ) Earthingor other suitable precautions ( d ) Connections
5 : Regulation 11 of the Electricity at Work Regulations is concernedwith ? ( a ) Allows protective devices to be shorted out during test ( b ) Allows fuses to be shorted outduring test ( c ) Does not allowprotective devices to be shorted out during test (d ) Allows MCBs to be shorted out during test
6 : Regulation 16 of the EAWR states that noperson shall be engaged in any work Activity requiring knowledge or experience unless they are ? ( a ) Incompetent ( b ) Unsupervised ( c ) Competentor Supervised (d ) Self-employed
7 : Working on orNear Live Conductors’ ? ( a ) Is allowedoutside working hours ( b ) Is not allowed under any circumstances (c ) Is allowed if itis unreasonable for them to be dead ( d ) Is not allowed unless rubber gloves are worn (try BQ )
8 : Regulation 13 of the EAWR is referring to ? ( a ) Workingspace , access and lighting (b ) Safe isolationprocedures (c ) Integrity of referenced conductors ( d ) Persons on whom duties are imposed

 

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1 : Voltage probes , voltage indicators and instruments test leads must complywith ? ( GS38 )

2 : Continuity testers indicate values off ? ( Ohms)

3 : Insulation testers indicate values off ? ( Megohms)

4 : Prospective Fault Current is measured in ? ( kA) ( PFC )

5: The Recommended sequence of test isgiven in BS-7671 : 2008 ( PART 6 ) ( you may have to use this on your test ) 1 : 612.2 ( 2 : 612.2 .2 ( 3 : 612.2.3 ( 4 : 612.6 “regs out “

6: The last three test to be carried outare ? 612.12 ( 612.13 ( 612.14 ) “regs out “

7: Circuit Protective Conductors’connected ?
( a ) Gas and Water services to main earthterminal
( b ) The main earth terminal to consumerunit
( c ) Exposedconductive parts to the main earth terminal
( d ) Supplementary bonding to main earthterminal

8: Main bonding conductors’ for Gas andWater etc , are tested for continuity with a continuity tester
(a ) End to End ( b ) Through the metalpipe ( c ) Endto end after disconnecting one end from the bonding clamp
(d ) At one End and the metal pipe

9: When testing a final circuitcontinuity ( R1 + R2 ) the circuit isswitched on and off at the control switch to Verify ?
(a ) There is a supply present ( b ) Theswitch operates correctly ( c ) The polarity iscorrect
(d ) There are no loose connections

10: Maximum permissible test values for final circuit loop impedance can be foundin ? “regs out “
(a ) BS-7671 : 2008 ( b ) IEE Guidance Note 3 table 2D ( c ) Electricity at Work Regulations1989 ( d ) HSE GS38
o.s.g
11: Before carrying out a continuity test the instrument should be ?
(a ) Face upwards ( b ) Nulled to eliminate test leadresistance ( c ) Switched off ( d ) Set on the Kilohms range

12: Prior to carrying out insulation resistance testing the client needs to beConsulted for ?
(a ) Amount of time required to complete the test ( b ) Supervising the test
(c ) Ensuring test voltages are no danger toequipment , persons or livestock ( d ) Extra help if required

13: During the safe isolation procedure GS-38 Approved Test Lamps or Voltageindicators should be ?
(a ) Tested at twice their rated voltage ( b ) Tested before and after use on knownsupply proving unit a must

14: An RCD when tested at 50% of its trip rating should ?
(a ) Not trip a must ( b ) Trip within 300mS ( c ) Trip within 40mS ( d ) Trip within 100mS

15: An RCD when tested at 100% ( x1 times ) of its trip rating should ? ( PS - BS-EN ) ◄◄
(a ) Not trip ( b ) Trip within 300mS a must ( c ) Trip within 40mS ( d ) Trip within 100mS

16: An RCD when tested at 500% ( x5 times ) of its trip rating should ?
(a ) Not trip ( b ) Trip within 300mS ( c ) Trip within 40mS a must ( d ) Trip within 100mS

 

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Measurementusing Earth Electrode Test Instrument . ( 3 x Rods )
Threemeasurements are taken : 79ohms+ 85ohms+ 80ohms . a must
Addedall together : 244Ω . 244ohms / 3 = 81.33ohms

 

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Unit101 ( 1.2 )

( 1) Regulation 610.2 of BS-7671 : 2008 requires Information prior toan Inspection and test is made available to the ?
Answer: Shall bemade available to the person or persons carrying out the Inspection and testing

( 2) The results of the Assessment of an Electrical Installation with regards toprotection for Safety shall be made Available to the ?
Answer: Inspectorprior to carrying out the Inspection and test

( 3) Which of the following is Not a fundamentalprinciple with regards to protection for Safety ?

Answer: ( a ) protection against ingress of water : ( b ) protection against thermal effects :
(c ) protection against faultcurrent ( d ) protection against voltage disturbances

( 4) Which of the following is Afundamental principle with regards to protection for Safety ?
Answer: ( a ) Measure’s against the ingress of dust ( b ) Measure’sagainst the Electromagnetic disturbances
(c ) Measure’s against damage toequipment ( d ) Measure’s against theingress of water

( 5) The results of the Assessment of an Electrical Installation with regards togeneral Characteristics shall be made Available to the ?
Answer: ( a ) Tenant of the building ( b ) Owner of the building
(c ) Electrician carrying out any sub-contractors work ( d ) Inspector prior to carrying out an inspection and test

( 6) Which one of the following is Not a generalCharacteristic of an Electrical installation ?
Answer: ( a ) Supplies for SafetyServices ( b ) Number offinal circuits ( c ) Maximumdemand and diversity ( d ) Type of Earthing arrangement

( 7 ) Which one of the following is a generalCharacteristic of an Electrical installation ?
(a ) Number and type of live Conductors ( b ) Type of wiring system ( c )Routing of cables ( d ) Number ofConsumer units or distribution boards within the installation

(8 ) Information such as diagrams and schedules shall be made available to the ?
(a ) Architect during the design stage of a building ( b ) Electrician on completion of anElectrical installation
(c ) the person ordering the work ( d ) Theinspector prior to carrying out an inspection and test

(9 ) Which one of the following is Not required to be given on a diagram orschedule ?
(a ) Place in or near to the relevant distribution board ( b ) Given to the person ordering the work
(c ) Placed at the origin of the supply ( d )Given to the tenant

(10 ) A durable copy of a distribution board schedule shall be ?
(a ) Place inor near to the relevant distribution board ( b) Given to the person ordering the work
( c ) Placed atthe origin of the supply ( d ) Given to the tenant

 

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Unit101 1.3
( 1) The H.A.S.A.W Act came out in ? ( a ) 1974

( 2) Regulation 16 of the Electrical at Work Regulations 1989 is concernedwith ?
Competence

( 3) The Electricity at Work Regulations1989 is ? p - 241
( b) Statutory

( 4) The H.A.S.A.W Act 1974 appliesto ? ( d ) Employees , Employers & Self- employed

( 5) Part P of the Building Regulations applies to ?
( d) IEE guidance booklet

( 6) The 17[SUP]th[/SUP] Edition Wiring Regulations BS-7671 : 2008 is ?
(c ) Non Statutory

( 7) Test leads to GS38 should have ?
( b) 2mm exposed probe , Non fused lead or current limiting and finger barriers. 2mm to 4mm exposedprobe
NOTE . At this point.. 2mm - is for live-testing . 4mm - dead- testing . ◄◄◄◄ 2392 / 2394 .

Non-fused-leads.
Fused-Leads

( 8 ) The Electrical Safety , Quality and Continuity Regulations place a LegalObligation on ?
( c ) The Supplier

 

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2392-10

(1 ) During Erection and completion everyInstallation shall be Inspected and tested to Unity that ?
( b ) The requirements of the Regulations have been met

(2 ) During Inspection and testingPrecautions shall be taken in order to ensure supplies to ?
( d) Nodanger to person or damage to property and Equipment

(3 ) Once the initial verification has been completed an Electrical InstallationCertificate and Schedule of Inspection and test results ?
( a ) Is given to the person ordering the work

(4 ) Any defects or Omissions revealedduring initial Inspection and testing should be made good ?
( b) Before the Certificate isissued

(5 ) The Initial Verification shall becarried out by ?
( c) ACompetent person

(6 ) If an Additional alternative hasbeen carried out it must Not ?
( b) Increase the Electrical consumption

(7 ) The chapter in BS-7671 referring toInitial Verification is
( d ) 61

 

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Remember to covert to BS-7671:2008:2011: This will be the last time on 2392-10 . closed-book .

2392-10 ( Minor Electrical Installation Works Certificate p/336 )

(1)Q) An ElectricalInstallation Certificate is Issued for ? ( p/333
A)Initial Certification of a New Installation ,

(2)Q) An Additionor Alteration to an Existing Installation where New Circuit’s has beenInstalled Requires , ?
A)An ElectricalInstallation Certificate ,

(3)Q) Once an Electrical Installation Certificate has been Completed the Original should be ? A) Given to the Person Ordering the Work ,

(4)Q) The Electrical Installation Certificate should be Singed or Authenticated bythe ?
A) Competent Person or Person(s)

(5) Q) The Recommended Time Interval . beforethe First Periodic Inspection can be Obtained from ?
A) IEEGuidance Note 3 ◄ p/334 (7) - ( p/339 – Periodic Inspection Report )

(6)Q) A Minor Electrical Installation Works Certificate is Used for an Addition orAlteration that ?
A) DoesNot Include the Provision of a New Circuit ,

(7) Q) The Replacement of Equipment such asSocket-Outlet’s and Ceiling Rose Requires ?
A) A Minor Electrical Installation WorksCertificate ,

(8) Q) Minor Works Inspecting & Testingshould always be Carried Out ?
A) Regardless of the Extent of the Work ,

Unit101 ( 1.2 )

(1)Q) Regulation 610.2 of BS-7671:2008 , Requires Information Prior to anInspection & Test is made Available to the ?
A)Shall be Made Available to the Person or Person(s) Carrying out the Inspection& Testing , ( 2392-10 ↔ Person )

(2)Q) The Results of the Assessment of an Electrical Installation with Regards to Protection for Safety shallbe Made Available to the , ?
A) Inspector Prior to Carrying out theInspection & Test ,

(3) Q) Which of the Following is “ Not“ Fundamental Principle “ withRegards to Protection for Safety , ?
A) Protection Against Ingress of Water,

(4) Q) Which of the Following is a “ FundamentalPrinciple “ with Regards to Protection for Safety , ?
A)Measure’s Against the Electromagnetic Disturbances ,

(5 ) The results of the Assessment of an Electrical Installation with regards togeneral Characteristics shall be made Available to the ?
Inspector prior to carrying out aninspection and test

(6 ) Which one of the following is Not a general Characteristic of an Electricalinstallation ?
Number of final circuits

(7 ) Which one of the following is a general Characteristic of an Electricalinstallation ?
Number and type of live Conductors

(8 ) Information such as diagrams and schedules shall be made available to the ?
The inspector prior to carrying out aninspection and test

(10 ) A durable copy of a distribution board schedule shall be ?
Place in or near to the relevantdistribution board

 

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2392 / 2394: An Overview

Question: Instrument for Calibration .
TheUser . should ask to be ( Advised ) if it was found to be ( Inaccurate )Calibration certificate when returned . Do We .

BS-EN-61557consists of a number of ( Parts ) All parts .
Part Number - Title :
BS-EN-61557– Part - 1 )General requirements .
BS-EN-61557– Part - 2 )Insulation résistance . The fundamental reason behind Insulation is to protectuser against Electric Shock .
BS-EN-61557– Part - 3 )Earth fault loop impedance tester .
BS-EN-61557– Part - 4 )Low-résistance – ( Résistance of each Earth connection & equipotentialbonding )
BS-EN-61557– Part - 6 )Effectiveness of residual current devices ( RCD ) TN - . TT – systems
BS-EN-61557– Part - 7 )Phase sequence .

Regulations: Inspection . Testing Certification
Two-types.

Initial Verification .

Verification: is required for “ New-work “ & Alterations &Additions . ( EIC ) Certification .
Mustbe accompanied by a . Schedule of testresults & Schedule of inspections .

Periodic Inspection & Testing .
Isrequired for “ Existing installation(s) “ ( EICR )
Mustbe accompanied by a . Schedule of testresults & Schedule of inspections .

 

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Earth-fault-loop-impedance. ( Zs ) - Circuit-loop-impedance .
Why ! . This is essential for checkingthat , protective-devices operating in the required-time .

Prospective-fault-current.
Why ! . A test to measure the , highest-value of Either theprospective-short-circuit-current , or prospective-earth-fault-current at the origin , & other relevant-points within the variation .

 

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Carry out tests on , Earth-electrode(s) to ensure that their résistance is low enough to allow-fault-currents to flow-safety to Earth .

p.26 . Earth-electrode-résistance : the résistance of anearth-electrode to Earth .
p.26 . Earth-electrode : Conductive-part, which may be embedded in the soil orin a specific-conductive-medium , e.g. concrete , coke , in electrical-contact with the Earth .
TT - system : the consumer must provide their own connection to Earth . by installing asuitable earth-electrode local to the installation .

p.11 . O.S.G. 1.1. TT - system
TT - Arrangement , 21Ω is theusual-stated-maximum-résistance , ofthe distributor’s earth-electrode at thesupple-transformer . ↔ ( 1 )
The résistance of theconsumer’s-installation-earth-electrode , should be as low as practicable and a value-exceeding 200Ω may notbe stable . ↔ ( 2 )

Calculations for determining touch-voltage is ( Ze ) the rated ( mA ) of an RCD . RCD - 100mA ?
TT - system . 200Ω , 200Ω x 100mA ÷ 1000 = 20V

50V / 0.03A = 1666. 6666 . 1667Ω
50V / 0.1A = 500Ω

p.32 . Protective- equipotential-bonding: this is equipotential-bonding for the purpose of safety .

 

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Inspection & Testing :
The testing of an installation implies the use of instruments to obtain-readings .
Inspection : is necessary to make a visual-inspection ofthe installation . All existing-installations . should beperiodically-inspected & tested to ensure that they are safe & meet theRegulations - 610 , to 634 ,

Visual-inspection :
The installation must be visually-inspected before testing begins , visual-inspection is to confirm that allequipment & accessories are undamaged an comply with the relevant British-standards , & European-standards , and that theinstallation has been securely and correctly-erected .

 

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Useful-junk:

Wordused in the Trade . “ Dead “ Tests / Testing

Electricity at Work - Regulations 1989 . :gettree:

Dead ( as used inRegulations 13 / 14 )

The term “ Dead “ is not defined in the Regulations so it takes it’s , Ordinary-meaning . Thusin the context of the Regulations , for a conductor to be “ Dead “ meansthat it is neither , “ Live “ nor “ Charged “

 

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Electricity at Work - Regulations 1989 .

Fires of an , Electrical-Origin .

Firesmay be started by , electricity in a number of ways , the principal-mechanisms are:

- Overheating of cables and electrical-equipment due to ,overloading of conductors .
- Leakage-currents due to poor or inadequate-insulation .
- Overheating of flammable-materials placed toclose to , electrical-equipment , which is otherwise-operating-normally .

 

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Inspection & Testing of Electrical-installation(s)

Requirements: documentationis produced for all Installations - 132.13. “ Defined “ Every electrical-installation shall beprovided with appropriate-documentation

- Initial-Verification . New-installations . addition or alteration to an installation, Etc .
- Periodic-inspection , Existing-installation(s)


Existing-installation(s)

415.2. Additional - protection : Supplementary-equipotential-bonding.
Note 1 : Supplementary-equipotential-bonding, is considered as an , Addition to fault-protection . “ Defined “ in it’sday , Still out there

415.2.2.
Wheredoubt exists regarding the effectiveness of supplementary-equipotential-bonding , it shall be confirmed that the, résistance ( R ) between ,simultaneously-accessible , exposed-conductive-parts , & extraneous-conductive-parts , fulfils thefollowing-condition .

Where an RCD .is installed to protect the circuit the calculation to find out if , supplementary-bonding is required .

R = 50V / IΔn .

IΔn ) is the operating-current of theRCD . if it is a , 30mA - device . the calculation is as follows . ( R = 50V / 0.03A , R = 1666Ω ) Table- 41.5 30mA - 1667Ω

Where (Ia ) is the operating-current in Amperes of the protective-device for RCDs . replaced by ( IΔn ) 0.03A

 

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Ring-final-circuit: Test .

2392-10 , purpose of this test is to ensurethat . ??

- Cables form a complete Ring . Complete-Loop .
- No-interconnections.
- Polarity is correct . ( Polarity by continuity-method )
- When this test is carried-out-correctly it also gives , ( R[SUP]1[/SUP] + R[SUP]2[/SUP] ) value of the Ring-final-circuit .
►Existing-installations , Identifies-Spurs .

We have Two - 2.5mm[SUP]2[/SUP] cables wired in parallel . Regulation - 433.4.

p.83 433.4. Overload protection ofconductors in parallel.
Wherea single-protective-device protects ( Two or more conductors in parallel ) thereshall be no branch-circuits or devices for isolation , or switching in theparallel-conductors .

This Regulation , does not-preclude the use of , ring-final-circuits, with or without spur-connections .

Wheremore than one . ring-final-circuit isgetting installed . bareback the two - CPCs & twist themtogether . ring complete . Insulating-tapecomes off