***Cont../ Useful Information for Electricians & Apprentices***

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O.S.G.. The use of other methods’ of determining Maximum Demand is Not Precludedwhere Specified by the Installation Designer

FirstlyI make no Apologies for the Way am Writing on any Matters . it can be a first day Apprentice or some one Needing aJog of Memory .
Sowe are all in the Same Boat . “ To Learn “

For the Apprentices . The Day we stop learning is the Day we hang Upour Tool-Bag

CookerDesign Current Calculations

Thefirst thing you have to do is get Your Head around the Calculations !!

(From a Design point of View ) 2392-10

DomesticInstallation Oven(s) & Hob(s) are to be Calculated upon their MAXIMUM LOADING
Startwith a simple Calculation ( An Oven has a rating of 2kW ) 2000

(I = P/V ) Formula … I = 2000 ÷ 230V = 8.70A …. Weare Using the Unit Amps


2392-10/ Domestic Installation Oven(s)

Ovenhas 4 Rings ( 2 x 1kW ) & ( 2 x 1.5kW ) & Grill ( 2kW ) & Oven (3kW )

-Controlled via a CookerSwitch with a Socket outlet .

Asa Designer . we’ll have to Apply Diversity ??

Important )- Diversity allowance to be Applied to the FULL LOAD CURRENT for CookingAppliances .

TheO.S.G. is telling us . Purpose of the Final Circuit fed from theConductors )
O.S.G.Table 1B p/97 – column (3) Cooking Appliances → At the Top of the Page Note : Type ofPremises ( 2392-10 → Household Installations ) Domestic Installation(s)

DomesticInstallation(s) Only O.S.G. - 10A + 30% f.l – Full Load ) of connected Cooking Appliances in the Excess of 10A+ 5A if a socket-outlet is incorporated in the Control Unit . ( C.C.U. ) – 45A + 13A Socket Switched with Neon .

Fromyour point of View ( The First 10A ofthe rated current plus 30% of the reminder ( Plus) 5A if the Control Unit incorporates s Socket.

Calculations)- You bank “ Hold OFF“ the first 10 Amps of the Maximum Load Current )
The10A will be used at the End of the Calculations’

-So your Work out the Total Power Rating & then calculate the Full Load Current

Calculations)- Power = ( 2 x 1 ) + ( 2 x 1.5 ) + ( 2+ 3 ) = 10kW

I= 10000 ÷ 230V = 43.48A … round it up to the first four numbers43.47826087 ( 48 ) 43.48A

UsingDiversity allowance stated ↑↑ ( 43.48A sub 10A = 33.48A )

I= 33.48 x 30 ÷ 100 = 10.04A

Youradding the ( 5A ) for Socket outlet . I = 10A + 10.04 + 5A = 25.04A )- Asa Designer this is your Expected Current Demand .

Remember )- Supply Cables Rated to suit DesignCurrent ( Iz )

 

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VoltageRating :
:17:
TheVoltage rating of the Overcurrent Protective Devicemust be at least Equal to or Greater than the circuit Voltage .

Voltagerating of an Overcurrent Protective Device is afunction of its capability to open a circuit under an Overcurrent condition .
Thevoltage rating determines the Ability of the OvercurrentProtective Device to “ Suppress “ & “ Extinguish “ the internal arcing that occurs during the openingof an Overcurrent condition .

Ifan Overcurrent ProtectiveDevice is used with a voltage rating lower than the circuit voltage . arcsuppression & the ability to Extinguish the arc will be Impaired & .under some Overcurrent conditions . The OvercurrentProtective Device may NOT clear the OvercurrentSafely .
Thevoltage rating is required to be marked on all OvercurrentProtective Device .

 

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RCBO is RCD+ MCB - ( RCBOs combines the functions of an MCB &RCD in One Unit )

RCD do Nothave Overload Protection . it needs a separate MCB t o backupprotect it . So an RCBO is formed :17:

Residual Current Breaker with Overload Protection

 

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ExposedConductive Parts : :juggle2:

Thesesare Metallic Parts of an Electrical System .which can be touched & which are not normally Live .
Thesecan become Live under Fault Conditions .

Metalcasings of “ Appliances“ ( Kettles . Ovens . )
Wiringcontainment systems such as Metal Conduit . Cable Tray & Trunking .

ExtraneousConductive Parts : :juggle2:

Theseare Metallic Parts within a Building . which do not frompart of the Electrical System . but canalso become Live under Fault Conditions .

Water & Gas Pipes .
AirConditioning .
Boilers .
AirDucting System .
StructuralSteel Work of the Building .

Purposeof Earthing .
Byconnecting to Earth all Metalwork not intended to carry current . a path is provided for leakage currentwhich can be detected & interrupted by RCDs . MCBs

CleanEarth return path from the Consumers Earth to the Supply Earth .

TheEarth Fault Loop.
Theconnection at the consumers Earth can be by means of either an Earth Electrodeat the building were the Earth isrequired or may be in the form of acable which runs back to the Generatoror Transformer & is then connected to an EarthPoint .

Generatoror Transformer at the point of supply always has an Earthpoint . a circuit is formed when Earth – Fault currents are flowing .
Ifthese Fault Currents are large enough they will operate the protective device . thereby isolating the circuit .

The “ Star point“ of the secondary winding in a Three phase - Four – wire distribution transformer is connectedto the Earth to maintain the ( Neutral at Earth Potential )

 

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OverloadCurrent :
Occursin a circuit which is Electrical Sound . p/27 -

FaultCurrent :
Isthe level of current flowing at a level up to & including the ( Prospective Short Circuit Current ) being the Maximum Current that the SupplyTransformer is capable of delivering .

Prospective Short Circuit Current ) must also be taken into account whenselecting the Type of Overcurrent Deviceto be installed .

FaultOccurs at the point between Line Conductors of negligible Impedance or betweena Live Conductor & an Exposed Conductive Part . [ it ismore serous than an Overload Current ]

Wherethe Earth Fault Loop Impedance for a circuit exceeds the maximum ( Zs ) for theOvercurrent device . is it permissibleto use an RCD .
Yes:- Regulation – 411.4.4. – 411.5.2.

Asthe Designer of an Installation . am I allowed to rely on the “ RCD element of an RCBO :49:“ to provide for Fault Protection in order toallow for Loop Impedance values greater than in table 41.3.

Yes:- so long as all the other ApplicableRequirements of the 17[SUP]th[/SUP] Edition ( asAmended ) are met . includingthose for Protection against Overload & Short Circuit .

Stillworking on an Electrical Installation that was designed before “ Amendment 1“ to BS-7671:2008 came into full Effect on ( 31 December 2011 ) to which requirements should theinstallation be ( Inspected . Tested . Verified & Certificated)

AnInstallation Designed before ( 31 December 2011 ) should be ( Inspected . Tested . Verified & Certificated) to BS-7671:2008 .That is to the Origin Version prior to the “ Amendment “

 

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MotorWindings : :49:

A Motorcan be manufactured with the Windings Internally Connected. if this is the case & there are Three Terminal Connections in the Terminal Block labelled .
( U . V .& W . ) you wouldexpect the Motor Windings to be connected in ( Delta Configuration)

MotorWindings with Delta Connection :
Theremay be four connections in the Terminal box labelled ( U. V . W . & N ) if this is the case . The Windings would bearranged to give a ( Star Configuration)

MotorWindings with Four Connections :

Alternatively. the Terminal block may contain Six Connections . ( U1. U2 . V1 . V2 . W1 & W2 . ) This is used where both Star & DeltaConfigurations are required .
TheTerminal connections can then be reconfigured for either Star or Delta .

MotorWindings with Six Connections :

• U1 . U2
• V1 . W2 .
• W1 . V2 .

 

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Cable Selection – Overview .

Requirements .

● The cable supplying the Load should be able to carry the current to the Load safety . After taking into account Diversity . without the cable overheating – ( 523 . App – 4 )
● Protective Devices should be able to provide protection for the cable from excess current ( 432.433. )
● The Length of the cable is Limited to ensure adequate voltage supplies the Load . ( 525 )
● Maximum Loop Impedance of a circuit is Low enough to ensure Disconnection within times specified by Table – 41.1.

● 0.4 – ( TN- ) 0.2 – ( TT ) for all circuits < 32A
5 sec . Disconnection time for Sub-mains distribution circuits

 

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612.7. Earthelectrode résistance .

Wherethe earthing system incorporates an earth electrode as part of the installation. the electrode résistance to Earth shall be measured .

NOTE : Where a measurement of( Ra ) is NOT practicable the measured value ofexternal earth fault loop impedance may be Met . :13:

 

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612.13. Functional testing :

Wherefault protection and/or additional protection is to be provided by RCD . theeffectiveness of any test facility incorporated in the device shall be verified.

612.13.2. Equipment . such as switchgear and controlgear assemblies . drivers . controls and interlocks. shall be subjected to a functional test to show that it is properly mounted .adjusted and installed in accordance with the relevant requirements of theseRegulations . :13:

 

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2392-10-

612.14. Verification of voltage drop .

Whererequired to verify compliance with Section 525 . the following options may beused .

(i)The voltage drop may be evaluated by measuring the circuit impedance .
(ii)The voltage drop may be evaluated by using calculations . for example . bydiagrams or graphs showing maximum cable length v load current for differentconductor cross-sectional areas with different percentage voltage drops forspecific nominal voltages . conductor temperatures and wiring systems .

NOTE : Verification of voltage drop is not normally requiredduring initial verification . – Still the Same :13:

 

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Certification& Reporting :

631.1.

Upon completion of the verification of a new installation orchanges to an existing installation . an Electrical Installation Certificate .based on the model given in Appendix 6 . shall be provided . Such documentationshall include details of the extent of the installation covered by theCertificate . together with a record of the inspection . the results of testingand a recommendation for the interval until the first periodic inspection . :rockon:

 

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Certification& Reporting :

631.2.

Upon completion of theperiodic inspection & testing of an existing installation . an ElectricalInstallation Condition Report . based on the model given in Appendix 6 . shallbe provided . Such documentation shall include details of the extent of theinstallation and limitations of the inspection & testing covered by theReport . together with records of inspection . the results of testing and arecommendation for the interval until the next periodic inspection . :13:

 

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631.3.

Where minor electrical installation work does not include theprovision of a new circuit . a Minor Electrical Installation Work Certificate .based on the model given in Appendix 6 . may be provided for each circuitaltered or extended as an alternative to an Electrical Installation Certificate. :13:

 

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631.4.

Electrical Installation Certificates . Electrical InstallationCondition Reports and Minor Electrical Installation Work Certificates shall becompiled and signed or otherwise authenticated by a competent person or persons. :13:

 

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631.5.

Electrical Installation Certificates . Electrical InstallationCondition Reports and Minor Electrical Installation Works Certificates may beproduced in any durable medium . including written and electronic mediaregardless of the media used for original certificates . reports or theircopies . their authenticity and integrity shall be verified by a reliableprocess or method . The process or method shall also verify that any copy is atrue copy of the original . :13:

 

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560.9. Emergency Lighting Systems .

Emergency Lighting Systems . shall comply with the relevant partof BS-5266 series .

560.10. Fire Detection and Fire Alarm Systems .

Fire Detection and Fire Alarm Systems . shall comply with the relevantpart of BS-5839 series . :13:

 

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Table41.1. .

411.3.2.2.
Themaximum disconnection time stated in Table 41.1 shall be applied to finalcircuits NOT exceeding 32A . :crazy:

Maximum disconnection times . ( No change on number ) 0.4 / 0.2 . Etc .

Bottom . Table 41.1.

Where . in a TT system . disconnection is achieved by anovercurrent protective device and protective equipotential bonding is connectedto all the extraneous-conductive –parts within the installation in accordancewith Regulation 411.3.1.2. the maximum disconnection times applicable toa TN system may be used .

Uo is the nominal a.c. r/ms or d.c. Line voltage to Earth .

Where compliance with this regulation is provided by an RCD . thedisconnection times in accordance with . Table 41.1 relate to prospectiveresidual fault currents significantly higher that the rated residual operatingcurrent of the RCD .

Note : Disconnection is not required for protection againstelectric shock but may be required for other reasons such as protection againstthermal effects .

 

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416.2.4.

Whereit is necessary to remove a barrier or open an enclosure or remove parts ofenclosures . this shall be possible only .

(i) Still the same – 17[SUP]th[/SUP] Edition.
(ii)Still the same – 17[SUP]th[/SUP] Edition .
(iii)Still the same – 17[SUP]th[/SUP] Edition .

Note: This regulation does not apply to :

A ceilingrose complying with BS-67
* A Cord operated switchcomplying with BS-EN 60669-1 . FirstAmendment :sunny:
A bayonetlampholder complying with BS-EN 61184
AnEdison screw lampholder complying with BS-EN 60238.

* A Cord operated switchcomplying with BS-3676 . – 17[SUP]th[/SUP] Edition.

 

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312.3. Deleted by BS-7671:2008 – Amendment no 1 . :sunny:

312.3. :- Type of Earthing Arrangement . 17[SUP]th[/SUP]Edition . 2008

 

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411.4.7. No Change . “ First Amendedment“

Wherea circuit breaker is used to satisfy the requirements of regulation 411.3.2.2 or regulation 411.3.2.3. . Themaximum value of earth fault loop impedance ( Zs ) shall be determined by the formulain regulation 411.4.5 . Alternatively . for a nominal voltage ( Uo ) of 230Vand a disconnection time of ( 0.4s ) in accordance with Regulation 411.3.2.2.or ( 5s ) in accordance with Regulation 411.3.2.3. The values specified intable – 41.3. for the types and ratings of overcurrentdevices listed may be used instead ofCalculation .

 

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BS-1361:1971( 1986 )

Specificationfor cartridge fuses for A.C. circuits indomestic & similar premises .

Replacedby BS-88-3: 2010 and withdrawn 1/3/2010 . First Amendedment

 

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Appendix 1 . ( Normative) :13:

BS-EN 60898:1991 .
Specificationfor circuit-breakers for overcurrent protection for household & similar installations’.
Replacedby BS-EN 60898-1 : 2003 . but remains current .

▪ BS-EN 60898-1 : 2003 . Circuit breakers for A.C. operation .

▪ BS-EN 60898-2 : 2001 . Circuit breakers for A.C. & D.C. operation . BS-EN 60898-2: 2001 . remains current ( it was withdrawn in error and has been reinstated )

 

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Electrical Installation Certificate– Guidance for Recipient ( to be appended to the Certificate ) 17th Edition p- 334 / First Amendedment :13:

ThisCertificate is intended to be issued only for a new electrical installation orfor new work associated with an addition or alteration to an existinginstallation . it should not have been issued for the inspection of an existing electrical installation . An “ ElectricalInstallation Condition Report “should be issued for such an inspection .

 

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First Amendedment : Just a Reminder . :13:

“ Electrical Installation Condition Report “ p-396

Domestic□Commercial □ Industrial □ other ( include brief description )

Extent& Limitations of Inspection & Testing .
Extentof the electrical installation covered by this report . …………………..

Agreedwith : ……..
Operationallimitations including the reasons ( Regulation 634.2. )

( Regulation 634.2. )
Anydamage . deterioration . defects . dangerous conditions and non-compliance withthe requirements of the Regulations . which may give rise to danger . together withany significant limitations of the inspection & testing . including theirreasons . shall be recorded .

Summaryof the Condition of the Installation .
Generalcondition of the installation ( in terms of electrical safety )

… Overall assessment of the installation interms of its suitability for continued use .
SATISFACTOTY/ UNSATISFACTOTY ( delete as appropriate )
*An unsatisfactory assessment indicates that dangerous ( Code C1 ) and / orpotentially dangerous ( Code C2 ) conditions have been identified

Recommendations:
Wherethe overall assessment of the suitability of the installation for continued useabove is stated as UNSATISFACTOTY . I / we recommend that any observationsclassified as “ Danger present “ ( Code C1 ) or potentially dangerous ( Code C2 ) are acted upon as a matter ofurgency .
Investigationwithout delay is recommended for observations identified as “ further investigation required “
Observationsclassified as “ Improvementrecommended “ ( Code C3 ) should be given due consideration .

Oneof the following codes . as appropriate . has been allocated to each of theobservations made above to indicate to the person(s) responsible for theinstallation the degree of urgency for remedial action .

C1 – Danger present . Risk of injury . Immediate remedial actionrequired .
C2 – Potentially dangerous – urgent remedial action required .
C3 – Improvement recommended .

 

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17[SUP]th[/SUP]Edition / FirstAmendedment . :13:

612.2.1. No change .
612.2.2. No change .
612.3. No change .
612.3.1. No change .
612.3.2. No change .
612.3.3. No change .
612.4. No change .
612.4.1. No change .
612.4.2. No change .
612.4.3. No change .
612.4.4. No change .
612.4.5. No change .
612.5. No change .
612.5.1.
612.5.2. Any insulation or insulating arrangement of extraneous -conductive-partsintended to satisfy Regulation 418.1.4. (iii)
(i) when tested at 500V d.c.shall be not less than I megohm . &
(ii) shall be able to withstand a test voltage of at least 2kV a.c. r/ms . &
(iii) shall not pass a leakage current exceeding 1mA in normal conditions of use .

612.6. No change .

612.7. Where the earthingsystem incorporates an earth electrode as part of the installation . theelectrode résistance to Earth shall be measured .
Note : Where a measurement of ( Ra ) is not practicable themeasured value of external earth fault loop impedance may be used .

612.8.No change .
612.8.1.
a) TN- No change .
b) TT- No change .
c) IT- Compliance withRegulation 411.6. shall be verified by calculation or measurement of thecurrent ( Id ) in case of a first fault at the line conductor or at the Neutral.

Note 1 : The measurement is made only if calculation is notpossible because all the parameters are not known . Precautions are to be takenwhile making the measurement in order to avoid the danger due to a double fault.

Where conditions that are similar to conditions of a TT systemoccur . in the event of a second fault in another circuit ( see Regulation411.6.4. (ii)) verification is made as for a TT system ( see point b ) of this regulation .

Where conditions that are similar to conditions of a TN systemoccur . in the event of a second fault in another circuit ( see Regulation411.6.4. (i)) verification is made as for a TN system ( see point a ) of this regulation .

Note 2 : During measurement of the fault loop impedance . it isnecessary to establish a connection of negligible impedance between the neutralpoint of the system and the protective conductor preferably at the origin ofthe installation or . where this is not acceptable . at the point ofmeasurement .

612.9.No change .
612.10.No change .
612.11.No change .
612.12.No change .
612.13.1.No change .
612.14.No change .

 

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860.8. – Wiring Systems . :leaving:

560.8.1. One or more of thefollowing wiring systems shall be utilised for safety services required tooperate in fire conditions .

i) Mineral insulated cable systems complying with BS-EN 60702-1 and BS-EN 60702-2 and BS-EN60332-1-2.
ii) Fire-resistant cables complying with IEC 60331-1 or IEC60331-2 or IEC 60331-3 and with BS-EN 60332-`1-2.
iii) Fire-resistant cables complying with test requirements of BS-EN 50200or BS-8434 or BS-8491 . appropriate for the cable size and with BS-EN60332-1-2.
iv) A wiring system maintaining the necessary fire and mechanicalprotection .

the wiring system selected shall meet the requirements of the relevantcode of practice appropriate to the application and shall be mounted andinstalled in such a way that the circuit integrity will not be impaired during afire .

Note 1 : The codes of practice in the UK for emergency lighting . firealarms and life safety and fire fighting applications are :
i) BS 5266 Part 1 : Fire detection and fire alarm systems forbuildings – Code of practice for system design . installation . commissioningand maintenance .
ii) BS 8519 : Code of practice for the selection and installationof fire-resistant cables and systems for life safety and fire fightingapplications .

Note 2 : BS 5266 . BS 5839 & BS 8519 specifies cables to BS-EN 60702-1. BS 7629-1 & BS 7846 as being suitable when appropriately selected for theapplication .

Note 3 : Examples of a system maintaining the necessary fire andmechanical protection could be :
i) Constructional enclosures to maintain fire and mechanicalprotection . or
ii) Wiring systems in separate fire compartments .

560.8.2. Wiring for control and bus systems of safety servicesshall be in accordance with the same requirements as the wiring which is to beused for the safety services . This does not apply to circuits that do notadversely affect the operation of the safety equipment .

560.8.3. Deleted by BS-7671:2008 . Amendment No 1 & reserved for future use .

560.8.4. Circuits for safety services which can be supplied bydirect current shall be provided with ( Two-pole ) Overcurrent protection mechanisms .

560.8.5. Switchgear & controlgear used for both a.c. & d.c. supply sources shall be suitable for both a.c. &d.c.operation .

650.8.3. Deleted byBS-7671:2008.

The wiring between the safety source and the main distribution boardshall be erected in such a manner as to reduce to a minimum the risk ofShort-circuit or Earth fault or the risk of fire or danger to persons .

 

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First Amendment : Definitions.p/29

Inspection : Examination ofan electrical installation using all the senses as appropriate . :leaving:

17[SUP]th[/SUP] Edition : Definitions p/25

Inspection : Examination ofan electrical installation using all the senses as appropriate .

 

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Inspection :- :yawn:

611.3. –
The inspection shall include at least thechecking of the following items where relevant . including as appropriate allparticular requirements for special installations or locations ( Part 7 )

611.3. –

The inspection shall include at least thechecking of the following items . where relevant to the installation and .where necessary . during erection .

 

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Just a reminder . 17[SUP]th[/SUP]& FirstAmendedment :13:

Testing - 2391-10 / 2392-10.

612.1.
Thetests of Regulations 612.2. to 6 . Whererelevant . shall be carried out in that order before the installation is [ ENERGIZED ] .
Wherethe installation [ INCORPORATES ] an earthelectrode . The test of Regulation 612.7. shall also be carried out before the [ INSTALLATION is ENERGIZED]

Ifany test indicates a failure to [ COMPLY ] thetest and any preceding test . The results of which may have been [ INFLUENCED ] by the fault indicated . shall berepeated after the fault has been rectified .

 

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BS-EN 61558-2-23:2001 :leaving:
Particular requirements for Transformers’ for construction sites .
Replaced by BS-EN 61558-2-23:2010 butremains current .

 

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Exampleof items requiring inspection for an ElectricalInstallation Condition Report ◄ :leaving:

A visualinspection should firstly be made of the external condition of all electrical equipment whichis not concealed
Furtherdetailed inspection . including partial dismantling of equipment as required .should be carried out as agreed with the person ordering the work ( 612.2. )

Theseexample are not exhaustive . numbers in brackers are Regulation references .

ElectricalIntake Equipment :
□ Servicecable .
□Service cut-out / fuse .
□Meter tails – Distributor .
□ Metertails – Consumer .
□Metering equipment .
□Isolator .

Whereinadequacies in distributor’s equipment are encountered . it is recommendedthat the person ordering the report informs the appropriate authority .

 

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Presence of Adequate Arrangements for Parallel or SwitchedAlternative Sources ( 551.6: 551.7 )

Automatic Disconnection of Supply . :13:
□ Main earthing / bonding arrangements ( 411.3 : Chap – 54 )

1) Presence of distributor’s earthing arrangement ( 542.1.2.1. :542.1.2.2. ) or
2) Adequacy of earthing conductor size ( 542.1.2.1 : 542.1.2.2. )or
3) Main protective earthing conductor connections ( 542.3.2.)
4) Accessibility of earthing conductor connections ( 543.3.2. )
5) Adequacy of main protective bonding conductor sizes ( 544.1. )
6) Main protective bonding conductor connections ( 543.3.2. :544.1.2. )
7) Accessibility of all protective bonding connections ( 543.3.2.)
8) Provision of earthing / bonding labels at all appropriate locations( 514.11. )

Other Methods of Protection .
( Where any of the methods listed below are Employed detailsshould be provided on separate sheets )

• Non-conducting location ( 418.2. )
• Earth-free local equipotential bonding ( 418.2. )
• Electrical separation ( Section 413: 418.3 )
• Double insulation ( Section 412 )
• Reinforced insulation (Section 412 )

 

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542.1.2. Supply Arrangements .

542.1.2.1.
ForTN-S system . means shall be providedfor the main earthing terminal of the installation to be connected to theearthed point of the source of energy . Part of the connection may be formed bythe distributor’s lines and equipment .

542.1.2.2.
TN-C-S system . where protective multiple earthingis provided . means shall be provided for the main earthing terminal of theinstallation to be connected by the distributor to the neutral of the source ofenergy .

542.1.2.3.
Fora TT or IT system . the main earthing terminal shall beconnected via an earthing conductor to an earth electrode complying withRegulation ( 542.2. )

542.1.2.4.
Wherethe supply to an installation is at high voltage . protection against faultsbetween the high voltage supply ans earth shall be provided in accordance withSection 442.

(542.2. ) Earthing Arrangements .

 

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ConditionReport Inspection Schedule for Domestic & Similar Premises with up to ( 100A ) Supply :waving:
Note:- This form is suitable for many types of smaller installation not exclusivelydomestic .

ConsumerUnit(s) - Distribution board(s)

4.1. Adequacy of working space / accessibility to Consumer Unit / Distribution board ( 132.12 : 513.1. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.2. Security of fixing (134.1.1. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.3. Condition of enclose(s) in term of ( IP ) rating etc ( 416.2. ) [ Still the Same– 17[SUP]th[/SUP] Edition ]
4.4. Condition of enclose(s) in term of ( Fire ) rating etc ( 526.5. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.5. Enclose not damaged / deteriorated so as to impair safety (621.2. (iii)) [ Still the Same – 17[SUP]th[/SUP] Edition ]
4.6. Presence of main linked switch ( as required by 537.1.4. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.7. Operation of main switch ( Functional check ) 612.13.2.
4.8. Manual operation of circuit-breakers and RCDs to provedisconnection ( 612.13.2. )
4.9. Correct identification of circuit details and protectivedevices ( 514.8.1. : 514.9.1. )
4.10. Presence of RCD quarterly test notice at or near Consumerunit / Distribution board ( 514.12.2. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.11. Presence of non-standard ( mixed ) cable colour warningnotice at or near Consumer unit / Distribution board ( 514.14. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.12. Presence of alternative supply warning notice at or near Consumerunit / Distribution board ( 514.15. )
4.13. Presence of other required labelling ( please specify ) –Section 514.
4.14. Examination of protective device(s) and base(s) : correcttype and rating ( no signs of unacceptable thermal damage . arcing oroverheating ( 421.1.3. ) [ Still the Same – 17[SUP]th[/SUP]Edition 421.3.]
4.15. Single-pole protective devices in line conductor only . (132.14.1 : 530.3.2. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]
4.16. Protection against mechanical damage where cables enter Consumerunit / Distribution board ( 522.8.1. :522.8.11. – the same )
4.17. Protection against electromagnetic effects where cablesenter Consumer unit / Distribution board / Enclosures ( 521.5.1. ) [ Still the Same – 17[SUP]th[/SUP] Edition ]
4.18. RCD(s) provided for fault protection – includes RCBOs (411.4.9.: 411.5.2. – the same : 531.2. – the same )
4.19. RCD(s) provided for additional protection - includes RCBOs (411.3.3. : 415.1. - Still the Same )

OUTCOMES:- Acceptable condition ( Tick ) : Unacceptable condition State – C1 or C2 ) Improvementrecommended State – C3 ) Not Verified N/V ) Limitation LIM ) Not applicable N/A )

OUTCOME:- Use codes above . Provide additional comment where appropriate .
C1. C2 . & C3 . Coded items to be recorded in section K of the ConditionReport .
Furtherinvestigation required ? ( Y or N )

 

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612.13.2. Equipment . suchas switchgear and controlgear assemblies . drives . control and interlocks .shall be subjected to a functional test to show that it is properly mounted .adjusted and installed in accordance with the relevant requirements of theseRegulations .

612.13.2. Assemblies . suchas switchgear and controgear assemblies . drivers . controls and interlocks .shall be subjected to a functional test to show that they are properly mounted. adjusted and insalled in accordance with the relevant requirements of theseRegulations .

514.9.1. ) for simple installations the forgoing information maybe given in a schedule . A durable copy of the schedule relating to a distribution board shall be provided within oradjacent to each Distribution board

514.9.1. ) For simpleinstallations the foregoing information may be given in a schedule . A durablecopy of the schedule relating to a Distribution board shall be provided within or adjacent to each Distributionboard . Any symbol used shall comply with BS-EN 60617.

514.9.2. Any symbol used shall comply with IEC-60617.

( 514.8.1. ) [ Still the Same – 17[SUP]th[/SUP]Edition ]

( 514.15. ) Where aninstallation includes alternative or additional sources of supply . warningnotices shall be affixed at the following locations in the installation .
( 514.15. ) Where aninstallation includes a generating set which is used as an additional source ofsupply in parallel with another source . waring notices shall be affixed at thefollowing locations in the installation .

( 522.8.1 ) A wiring system shall be selected and erected to avoidduring installation . use or maintenance . damage to the sheath or insulationof the cables and their terminations . The use of any lubricants that can havea detrimental effect on the cable or wiring system are not permitted .
( 522.8.1 ) A wiring system shall be selected and erectedto avoid during installation . use or maintenance . damage to the sheath orinsulation of the cables and their terminations.

( 411.4.9.) . Where an RCD is used to satisfy the requirements’ of Regulation 411.3.2.2. the maximum values of earth faultloop impedance in table 41.5. may be applied for non-delayed RCDs to BS-EN 61008-1and BS-EN 61009-1 for a nominal voltage ( Uo of230V ) In such cases . an overcurrentprotective device shall provide protection against overload current and faultcurrent in accordance with Chapter 43 .

( 411.4.9.) Where an RCD isused to satisfy the requirements’ of Regulation 411.3.2.2. the maximum values of earth fault loop impedance in table41.5. may be applied for non-delayed RCDs to BS-EN61008-1 and BS-EN 61009-1for final circuits not exceeding 32A . In such cases . an overcurrentprotective device shall provide protection against overload current and faultcurrent in accordance with Chapter 43 .

( 411.3.3. ) An exception to (i) is permitted for :
a) socket-outlets for use under the supervision of skilled orinstructed persons . or .
b) A specific labelled or otherwise suitably indentifiedsocket-outlet provided for connection of a particular item of equipment .
( 411.3.3. ) An exception to (i) is permitted for :
a) socket-outlets for use under the supervision of skilled orinstructed persons . e.g. in some commercial industrial locations . or
b) A specific labelled or otherwise suitably indentifiedsocket-outlet provided for connection of a particular item of equipment .

Note 1 & Note 2 - Thesame . 17[SUP]th[/SUP] Edition .

 

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Symbols used in the Regulations resents3:

( Ze ) That part of the earth fault loop impedance whichis external to the installation ( Ω ) –313.1.
( Zs ) Earth fault loop impedance ( Ω ) – 411.4.5.
( R1 ) Résistance of lineconductor of a distribution or final circuit ( Ω ) – Appx 6 Schedule of test results .
( R2 ) Résistance ofcircuit protective conductor ( CPC ) of a distribution or final circuit ( Ω ) – Appx 6 Schedule of test results .

 

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ProtectionAgainst Overload Current . resents3:

433.1. Every circuit shall be designed so that a small overload oflong duration is Unlikely to Occur .
433.1. Every circuit shall be designed so that a smalloverload of long duration is Unlikely to Occur .

 

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433.1. Co-ordination between Conductor & Overload protective device.

 

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Fundamentalrequirement to understand the basic principles . Measured / Calculated resultsand what affect they have on a circuit .

 

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□ Listall the Relevant documentation that need to be Completed for this ElectricalInstallation Condition Report . :19:

- NewElectrical Installation / “ Meaning “ Initial Verification .
( InitialInspection Test & Verification )

Definitions’ - p/36 . FirstAmendedment .
Verification ) All measures by means of which compliance ofthe Electrical Installation with the relevant requirements of ( BS-7671 ) are checked . comprisingInspection . Testing & Certification .

“ Certification & Reporting “
- Electrical Installation Condition Report .
- Schedule ofInspections . ( 2392-10 ) for New Installation Work Only :- First Amendedment. Tells us .
- Condition ReportInspection Schedule ) :- for Domestic andsimilar premises with up to 100A Supply .

632 – Initial Verification :

632.1. Following the Initial Verification required by Chapter 61 . an ElectricalInstallation Certificate together with schedules of inspection and schedules oftest results . shall be given to the person ordering the work . These schedulesshall be based on models given in Appendix 6 .

632.2. The schedules of test results shall indentify every circuit. including its related protective device(s) and shall record the results ofthe appropriate tests and measurements detailed in Chapter 61 .

632.3. The person or persons responsible for the design .construction . inspection & testing of the installation shall . asappropriate . give to the person ordering the work a Certificate which takesaccount of their respective responsibilities for the safety of thatinstallation . together with the schedules described in Regulation 632.1.

632.4. Defects or omissions revealed during inspection &testing of the installation work covered by the Certificate shall be made goodbefore the Certificate is issued . -&-s

 

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□As an “ Inspector “ Existing Installation :19:
PeriodicInspection Report And Testing .

“ Certification & Reporting “
- ElectricalInstallation Certificate Report .
- Schedule of Inspections .
- Schedule of Test Results .

634 – Periodic Inspection & Testing .
634.1. Following the periodic inspection & testing describedin Chapter 62 . an Electrical Installation Certificate Report . together withschedules of inspection & schedules of test results . shall be given by theperson carrying out the inspection . or a person authorized to act on theirbehalf . to the person ordering the inspection . these schedules shall be basedon the models given in Appendix 6 . The schedule of test results shall recordthe results of the appropriate tests required of Chapter 61 .

634.2. Any damage . deterioration . defects . dangerous conditionsand non-compliance with the requirements of the regulations . which may giverise to danger . together with any significant limitations of the inspection& testing . including their reasons . shall be recorded .

621.5. Periodic inspection& testing shall be undertaken by a Competent Person .

Definitions’ - p/25 . FirstAmendedment .
Competent Person : Aperson who possesses sufficient technical knowledge . relevant practical skills& experience for the nature of the Electrcal Work Undertaken & is ableat all times to prevent danger and . where appropriate . injury to him /herself and others .

Inspection& Testing )- are Two different Words “ Meaning “

Definitions’ - p/36 . FirstAmendedment .
Testing ) Implementation of measuresto assess an Electrical Installation by means of which its effectiveness isproved . This includes ascertaining values by means of appropriate measuring instruments. where measured values are not detectable by Inspection .

Definitions’ - p/29 . FirstAmendedment .
Inspection ) Examination of an ElectricalInstallation using all the senses as appropriate .