***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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□ Safe Working Procedure .

Regulation 12 . of the Electricity at Work Regulations1989 . deals with means of cutting off the supply & for isolation .

- cutting off the supply of electrical energy to anyelectrical equipment . &
- the isolation of electrical equipment .

Regulation - 611.1.1. . Reminds us. “ States “ that inspection shall precede testing &shall normally be done with that part of the installation under inspectiondisconnected from the supply .

 

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Reading the latest examiners report of the 2391-10 exam. States that candidates lost marks for not putting down that Insulationrésistance ohmmeters need leads to GS-38 .

Before you lose an all important mark for using yourcommon sense .
GN-3 . p/81. 4.1. Instrument Standard .

GN-3 : By it’s Own Admission . it is Notcompulsory or statutory .

Reference was made to the use of test leads whichconform to HSE Guidance Note GS-38 . should be observed for ALL instruments .leads . probes & accessories . it should be NOTED that some test instrumentmanufacturers advise that their instruments be used in conjunction with ( Fused Test Leads &Probes )

Other manufactures advise the use of Non-fused leads . & probes when the instrument has ( in-built electrical protection )

2391-10 . Forthe Sake of -&-s.
GN-3 / GS-38 : BUT “ itshould be NOTED that such electrical protection does NOT extend to the PROBES & LEADS . Why looseMarks . GS-38Leads .


Am waiting for my GN-3 / 2012 . it does not get published until 2April .

 

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“ Initial Verification “

( R[SUP]1[/SUP] + R[SUP]2 [/SUP] ) isrequired on a NEW INSTALLATION because you should NOTenergise without ascertaining that the installation is safe to do so .

NEW WORK “Initial Verification “ 2392-10 : to comply with BS-7671:2012 .

“ Initial Verification “ is to be completed for any NEW WORK &Alterations & Additions .
The purpose being to ensure that the equipment &accessories are to a relevant standard . the installation complies withBS-7671:2011 & that it safe .

The responsibility for comparing Inspection & Testing results with relevant criteria / lieswith the Inspector .

 

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The purpose of this “ Condition Report “ is toconfirm .

Section E . summary of the condition of the Installation . p/396

C1 : ( Danger present ) the safety of thoseusing the installation is at risk . p/399 ( 7 )
The Report should identifyany damage . deterioration . defects & / or conditions which may give riseto danger .

C2 : ( Potentially dangerous ) the safety of thoseusing the installation may be at risk .
It is recommended that acompetent person undertakes the necessary remedial work as a matter of urgency.

Section F . Recommendations . p/399 . ( 10 )

For safety reasons . the electrical installation shouldbe re-inspected at appropriate intervals by a competent person . therecommended date by which the nextinspection is due is stated in Section F . ofthe Report under “ Recommendations “ & on a label near to the Consumer Unit / Distribution board .

Section F p/396 . Subject to the necessary remedial action being taken . I / we recommendthat the installation is further inspected & tested by ……….. date ….

 

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State :
Apart from loose connections. Three . circumstances that would result in an increase in conductorrésistance .
i) Increase in ambient temperature .
ii) Increase circuit length /additions .
iii) Decrease conductor cross-section / modifications .

“ Insulation Résistance “

• for the Insulation Résistance Test on a 230Vinstallation
State the :
a) test voltage to be applied .
b) minimum value of résistance acceptable .
c) Value below which further investigation isrequired .

for the Insulation RésistanceTest on a 230V installation .
a) 500V .
b) 1.0MΩ
c) 2MΩ

State : the effects onInsulation Résistance of an installation if .

i) Additional circuits are added )- Decreases .
ii) Circuits weredisconnected / removed )- Increases
iii) The length of a 10A lighting circuit wasextended )- Decreases.

 

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2011: BS-4444: 1989 ( 1995 ) p/278.

This may come up on the 2012. -&-s . Hospitals’ / Earthing. Yeah .

Guide to Electrical Earth Monitoring.

□ Q)- Explains the principles involved in thedesign & construction of earth monitoring devices . & the prerequisitesfor their successful application .
Which of the following has an impact upon earthing . ?? [ BS-4444 ] :mad2:

543.3.4.
543.7.1. 102 (iii)
543.7.1. 103 (iv)

 

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Apprentices .

To make you use the Regulations . BS-7671:2011 . [ -&-s Open Book ]

Q) -&-s . A radial circuit . wired in 2.5mm[SUP]2[/SUP] T&E insulated & sheathed cable protected by20A overcurrent protective device . may feed any number of sockets . provided the totalfloor area does not exceed . [ 50m[SUP]2[/SUP] ] p/426

Q) -&-s . A ring final circuit . wiredin 2.5mm[SUP]2[/SUP] T&E insulated & sheathed cable protected by 30AOr 32A overcurrent protective device . may feed any number of sockets . provided the totalfloor area does not exceed . [ 100m[SUP]2[/SUP] ] p/425

p/425 : (iv) Takingaccount of the floor area being served ( Historically ) a limit of 100m[SUP]2[/SUP] has been adopted .

□ A visual inspection of a new installation mustbe carried out . When !. During erection . beforetesting & upon completion.

□ The testrequired by the regulations to ascertain that circuit protective conductors arereliably & correctly connected is . Continuity of CPCs . 612.2.1.

□ Equipment which displays the BSI kite mark .
A) Has beenproduced under a system of supervision & control by a manufactures holding a license .

□ Electrical equipment must always .
A) Conform toa BS – Or BS-EN standard .

□ The CE mark .
Is an indication that the product meets the legalsafety requirements of the European commission .

 

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Insulation Résistance Testing to Earth .

p/38 : For the sake off GN-3 : Althoughan insulation résistance value of not less than 1.0MΩ complies with the Regulations . ◄◄
GN-3 : Where an insulation résistanceof less than 2MΩ is recorded the possibility of a latentdefect exists . ◄◄ . Exams 2391-10

Regulations Note 2 table 61 : insulation résistance values are usually much higher thatthose of Table 61 .

□ When testing a 230V installation . an insulation résistance tester must supply a voltage of ! . 500V D.C.
□ The value of a satisfactory insulation résistance test oneach final circuit of a 230V installation must be ! . Notless than 1.0MΩ .
□ The value of a satisfactory insulation résistance test ona SELV circuit must be ! . Not less than 0.5MΩ .

□ The maximum recommended periodic inspection &test interval for a Domestic Installation is !
P/63 - GN-3: Domestic . Maximum period betweenInspections & Testing as necessary . : A)- Changeof occupancy / 10 years

 

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□ The IET WiringRegulations ( BS-7671:2008:2011 ) are recognized as . [ being in compliancewith statutory regulations ]
□ The legislationwhich prohibits live working exceptional circumstances is . [ Electricity at Work Regulation 1989 ]
□ When calculationsshow that the voltage drop between the supply terminals & a heating loadwill exceed 5% of the supply voltage . the action to be taken is to .
[ increase the size of the cable supplying the load ]
□ To comply withIET Wiring Regulations the voltage drop on a three-phase 400V powercircuit should not exceed . [ 20V ]
□ A componentdesigned to disconnect a supply under full load conditionsis . [ A switch]

 

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TT- system . The CPC still needs to carry the [ PFC ] current for a fraction of a secondrequired for the RCD to operate .
TT- system . in order to comply with the 17[SUP]th[/SUP] Editionwhere Addition Protection is required this needs to be provided by a 30mA RCDor RCBO .

TT- system .

Discrimination . Ability of aprotective device to operate in preference to another protective device inSERIES . “ Example “

Time delayed 100A / 100mA . RCD .
Opposed to the Normal 100A / 100mA RCD .

if you used the Non-time delayed RCD & your [ 30mA – RCD ] tripped you could loseboth RCDs protected circuits due to there being NO discrimination between the RCDs.

Time-delayed RCD only the [ 30mA– RCD ] wouldtrip . “ Wehave Discrimination BS-7671:2011 “ :juggle2:

 

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TT- system . 30mA / RCD(s) O.S.G. – P/16

If ALL finalcircuits have RCD protection within a Dwelling that has a TT-system . Then NO additional RCDdevice would be required at the Main Intake .

OR ON A Dual board containing two 30mA / RCDs

 

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Regulation& it’s Implications’ .

Table55.1 . p/174. Low voltage circuits .

Q). Plugs & socket – outlets ( Industrialtype ) 16 . 32 . 63 . 125 . BS-EN-60309-2 .
ExtensionCable . should be evaluated to make sure it is suitable for use in theEnvironment where it is intended for Use .

Example – Portable / Mobile Equipment [ On wheels] will be disconnected form the supplywhen not in Use . BS-EN-60309-2 .

725.55.2.6. “ Example “
Themeans of connection to the caravan pitch socket-outlet shall be supplied withthe caravan & shall comprise the following .
(i) A plug complying with BS-EN-60309-2 .

 

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BS-7671:2008:2011 . Requirements for Electrical Installations .
Definesthe [ WiringStandards for the UK ] Installationsto this standard are regarded [ AS ] giving conformitywith the relevant parts of Electricityat Work Regulations 1989 . Whilst theiruse is not [ Mandatory ] Electricity supply Authorities may refuse toconnect an installation [ NOT ] conforming to this standard .

Thisstandard requires the use of { RCDs ] inassociation with main extensions leads as follows .
Theuse of RCDs under Normaluse & Outdoors .

Regulation. 411.3.3. .
States)- In a.c. systems . additionalprotection by means of an [ RCD ] in accordancewith Regulation 415.2. shall provide for :
i) Socket – outlets with a rated current notexceeding 20A that are for use by Ordinary Persons . & are intended forgeneral use . &
ii) Mobile equipment with a current ratingNot exceeding 32A for use Outdoors .

RCDs. are required as Additional Protection . ( ADS)
Regulation. 415.1.1. . States

Theuse of [ RCDs ] with a rated residual operating current [IΔn ] not exceeding 30mA & an operating time not exceeding 40mS at the rated residual operating currentof 5 x IΔn . is recognised in a.c. system s

Asadditional protection in the event of failure of the provision for basic .protection &/or the provision for fault protection or carelessness by User.

Theuse of an [ RCD ] does not prevent the need forother means of protection . such as suitable earthing .

Regulation. 415.1.2. . States .
Theuse of [ RCDs ] is not recognised as a solemeans of protection & does not obviate the need to apply one of theprotective measures specified in Section – 411to 414 .

Overcurrentdevice MCB . & RCD must be used .

Thisis to ensure that the automatic disconnection of the supply will occur within aspecified time [ 0.4 – 230V . Open Circuit ] supply for socket-outlets which supply [ Mobile Equipment ] intended for manual movement whilst in use or handheld Class 1 equipment .

Regulation. 411.3.2.2. – Table 41.1.requires maximum disconnection time for a TT- system earth system . 0.2s

Toensue that these conditions are Met any purchased equipment should be of such constructionto meet all the conditions in which it May Be Used.

 

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Q)Which of the following determines whether the selected protective devices willoperate within the required time frame : A) value of earth faultloop impedance [Zs]
takeyour pick . 41.3. MCB / BS-EN-60898 . RCBO / BS-EN-61009-1

The current ratingsof cables given in the tables of the IET Wiring Regulations are based on an Ambient temperature of : [ Unless stated Otherwiseon Exams ]
50 deg C.
40 deg C.
30 degC.
20 deg C.

 

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It’shere to Stay [ SPD ] 2012

Section 443 – Simple Risk Assessment ]

Thefollowing are different consequential levels of protection:

(i) . Consequences relatedto human life, e.g. safety services, medicalequipment in hospitals
(ii). Consequences relatedto public services, e.g. loss of public services, IT centres, museums
(iii). Consequences to commercial or industry activity,e.g. hotels, banks, industries, commercial markets,farms
(iv) . Consequences togroups of individuals, e.g. large residential buildings, churches, offices,schools
(v) . Consequences to individuals, e.g. small ormedium residential buildings, small offices.

For levels of consequences(i) to (iii) protectionagainst overvoltage shall be provided.

IsProtection Required – Section 443 / BS- EN -62305

( Yes ) - Risk of direct lighting to or near structure .BS-EN-62305 : or Lighting protection system installed . ? 443.1.1.
□ Lightning current [ Type 1 SPD ] or combined [ Type 1 + 2 SPD ] on main switch board to prevent dangerous flashover ( 534.2.1 )

Overheadline supplying the building at risk of direct strike – see BS EN-62305 (443.1.1)

( Yes ) - Overheadline supplying the building at risk of direct strike : BS-EN-62305 . 443.1.1.
[ Alternativesimplified risk assessment: 443.2.4. ]

Installation presents higher risk (e.g. fire) or requires higherreliability (443.2.2 Note) - see BS EN-62305
[ Alternativesimplified risk assessment: 443.2.4. ]

□ Protection against overvoltages not required ( 443.2.1, : 443.2.2 ) if equipment impulse withstand voltage toTable 44.3
Installationpresents higher risk (e.g. fire) or requires higher reliability ( 443.2.2Note ) - see BS EN-62305

Consequences related to human life? For example safety/medical equipment (443.2.4)
[ simplifiedrisk assessment : 443.2.4. ]

Coordinatedset of overvoltage SPDs for equipment protection e.g. Type 2 or Type 2+ 3 for distribution boards feeding sensitiveelectronic equipment (534.2.6)

□ Protection against overvoltages not required if equipment withstandvoltage to Table 44.3

Consequencesrelating to groups of individuals or individuals - for example residential buildings (443.2.4)

Consequencesrelated to loss of public service ? For example IT centres, museums (443.2.4)

Consequences related to loss of commercial/industry activity? For example hotels, banks, farms (443.2.4)

□ Check if data, signal and telecom lines require protection (443.1.1, 534.2.1)

 

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□ Whatare Transient Overvoltages – SURGES . Up to 6.000V. Almost 20 times Mains Supply . [ FAST ] ifnot “ MORE “

Justfor the sake of -&-s . Example .
Direct strike to building. [ Not too worry I have Lighting Protection System . ] WRONG. -&-s . NOT the EQUIPMENT in the BUILDING [ SPD ] may be required .???

 

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Where needed, use [ SPDs ] tested and applied in accordance to BS-EN -61643. Lowvoltage surge - protective devices .

Ifin Doubt . p/289 . Will tell you . BS-EN -61643-11. / BS-EN -61643-21. what direction to go in

BS-EN-62305-1 : General principles .
BS-EN-62305-2 : Riskmanagement .
BS-EN-62305-3 : Physicaldamage & life hazard
BS-EN-62305-4 : Electricaland electronic systems

Transientovervoltages transmitted by the supply distribution system are notsignificantly attenuated downstream in most installations (443.1.1 / Note3)

Section534 key areas – selection of SPDs
SPD in conjunction with RCDs .[ this is where -&-s will be looking g at 2012 ]

(i). SPDs installed before or upstream ofRCD – no tripping problem from overvoltages .
(ii). SPDs installed load side of RCD – nuisance tripping possible .
(iii). RCDs to have immunity to surge currents of 3kA ( 8/20 surge current waveform )
(iv). S Type RCDs meet this requirement

-&-s. There’s a high possibility CSA – Earthing . 534.2.10.
Minimumsize of connecting leads copper (or equivalent):
• 16mm2 for Type 1 SPDs
• 4mm2 for Type 2, 3 SPDs

 

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Fig53.3. p/146 . What the Hell !!!!

( OCPD ) what does it mean ?? : = Overcurrent Protective Device .
( E/I ) what does it mean ?? : Equipment or Installation to be protected against overvoltages . [Main earthing terminal or connecting conductor bar . ]

Example :

534.2.3.5Selection with regard to the prospective fault current and the follow currentinterrupt rating The short-circuit withstand of thecombination SPD and overcurrent protective device (OCPD), as stated by the SPDmanufacturer shall be equal to or higher than the maximum prospective faultcurrent expected at the point of installation.

NOTE 1: The OCPD may be either internal or external to the SPD.

Fault finding, safety precautions and principles Testing,basic principles of circuit protective conductor testing and insulationresistance Electrical symbols and mathematical prefixes. Transformer theory,calculation and practical. Relationship between line and phase voltage in a 3phase system New lighting / surge protection standards BS-EN-62305-1-4 and amendments17[SUP]th[/SUP] Edition wiring regulations

534.2.4Protection against overcurrent and consequences of SPD’s end of life

Protection against SPD short-circuitsis provided by [ OCPDs (see Figures 53.1 and 53.2) which shallbe selected according to the recommended ratings given in the manufacturer’sSPD instructions.

OCPD2 ] may be omitted if the characteristics of [ OCPD1 ] meetthe requirements given in the manufacturer’s instructions.

 

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Section 534 needs to be read fully in conjunction withSection 443 and table 44.3. Three types of SPDs . are

Recognised:

• Type 1 SPD located @ Main switch board
• Type 2 SPD located @ Sub/final distribution boards and consumerunits
• Type 3 SPD located @ Itemsof equipment

 

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• 526.3 . p/131
Every connection shall be accessible for inspection, testing andmaintenance, except for equipment complying with BS-5733 for a maintenance-freeaccessory and marked with the symbol [ MF ] and installed in accordance with themanufacturer’s instructions.

 

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ElectricalInstallation Condition Report ( EICR ).This is a report that will be used for domestic and similar installations up to100A and will include a Condition Report Inspection Schedule.

NOTE: If one or more genuine [ C1 or C2 ] codes are present, this will result in anunsatisfactory Electrical Installation Condition Report being issued. Theoption for further investigation is still available but it is now a tick box onthe inspection schedule.

C1- Danger Present
C2 - Potentially Dangerous

 

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Selectionof Electrical Equipment . p/20

2392-10: Some “ Fundamental Principles “

133.1.1. General . [ Dealing with ] Equipment to complywith standards unless agreed otherwise . [ Exams . -&-s . Part/ P ]
133.1.2.
133.1.3.

 

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Isolation& Switching . 537.1.6.

Ininstallations which include a [ Generator ] which can be used in [ Parallel ] as an additional source of supply . 2012 .
514.15.1. requires thewarning notice - Alternative supplies .

Postedat :
- Originof the installation .
- Meterposition if situated remote from the origin
-at the Consumer unit or Distributionboard to which the alternative or Additional sources are connected .
-at all points of isolation of all sources of supply .

PortableGenerators : 2012. -&-s
Additionalrequirements for protection by Automatic disconnection where the installation& [ GeneratingSet are NOT permanently Fixed ]
551.4.4.
Itis recognised that generators will be used occasionally as a temporary or short term means of supplying electricity.
- Useon a construction site .
-used to supply stalls on street markets .
-external gathering or function attended by the general public . such as acountry show .

O.S.G.- Temporary generators can be divided into two classes . Portable & Mobile .
Regulations. p/32 . ( see Mobileequipment )

Just making a Point . Read between the Line. O.S.G. 2011.
□ PortableGenerators : referenced to the generalmass of the Earth .

BS-7430: 1998 . Where there are extraneous – conductive – parts . or exposed – conductive– parts from other electrical systems present . generator reference earthing .by means of an earth electrode to the general mass of the earth . should beinstalled

Note : thatthis does NOT create a TT – supply arrangements. the supply will be TN-S in form from the generator . the neutral or starpoint being referenced to the general mass of the earth .

● Wherean earth electrode is supplied it will need to be tested by the standard methodusing a [ proprietaryearth electrode résistance tester ]

● Note : that an [ Earth faultloop impedance tester ] cannot be used for this test as the earthelectrode is NOT used as a means of earthing . it is used to reference theportable generator to the general mass of the earth & [ does NOT form partof the Earth Loop ]

Asthe earth electrode is used for reference & NOTas a means of earthing . it’s résistance should . ideally . be less than 200Ω

54.1. if buried generator reference Earthing . & or Bonding conductors should be sized inaccordance with table 54.1. 543.3.1. - 16mm[SUP]2[/SUP][SUP] [/SUP] conductor would generally be adequate for short – term usewhere NO mechanical protection
Just making a Point . Read between the Line. O.S.G. 2011.
□ PortableGenerators : referenced to the generalmass of the Earth .

 

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Usefuljunk : Identification of Conductors .

Table51. p/116
Notes. (3) Only the middle wire of three –wire circuits may be Earthed.

 

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p/398. Condition Report : -&-s . Notes for theperson producing the Report .

Q) What is the reason for issuing this Report .
(3) A) suchas change of occupancy or landlord’s periodic maintenance . 2391-10 .

(1)This Report should only be used for reporting on the condition of an Existing ElectricalInstallation .

(8)Wherever practicable . items classified as “ Danger present “ C1 . shouldbe made safe on discovery . Where this is not practical the owner or usershould be given written notification asa matter of URGENCY . 2391-10

 

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The person ordering the Report .
Wheninitially you are liaising with the [ Client ] regarding carrying out a Periodic Inspection& Test . it is important to establish the following Two Factors .

Extent.
Limitation.

(EICR ) SectionD . p/396 : Extent & Limitations of Inspection & Testing .

Extent : of the electrical installation covered bythis Report .
Agreed Limitations : including the reasons – 634.2.

634.2.
Anydamage . deterioration . defects . dangerous conditions & non-compliancewith the requirements of the regulations . which may give rise to danger .together with any significant limitations of the inspection & testing .including their reasons . shall be Recorded .

 

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2392-10:

Inspection& Testing . is to be carried out in a manner that will [ Ensure ] thesafety of both the Inspector & that of Others . “ Fundamental Principles “ Safety

Mostof the time the Question’s are right in front of our noses . BS-7671:2011 .

Q) On completion of a new installation .the Electrical Installation Certificate would be not signed by the :
i) design engineer.
ii) client . •
iii) person whoconstructed the installation .
iv) inspection &testing engineer .

p/390 : theanswer lies there . ( EIC )

Q) any addition to an existing installationshould . not impair the safety of the existinginstallation :
i) have a similar wiring system to that used inthe existing installation .
ii) be inspected & tested separate from the existinginstallation .
iii) not impair the safety of the existing installation .
iv) have it’s own energy meter separated fromthat of the existing installation .

MinorElectrical Installation Work Certificate for the replacement of a single protectivedevice where an Electrical Installation Condition Report . has identifieddepartures such as :
i)lack of additional protection by RCD .
ii) maximum loop impedance values exceeded .

&the remedial work would involve .

i) replacing a MCB with an RCBO .
ii)replacing a type C – MCB with a . type B. or replacing a 10A MCB with a 6Adevice .

p/393 : Minor Work Certificate makes provision for allthe required test results for the remedial work described .

requires [ Competent person] to certify that the work does not impair the safetyof the [ Existing installation ] &that the design . construction& inspection &testing of the work complies with BS-7671:2011 .

Recall : p/394 . Minor Electrical Installation Work Certificate– ( MEIWC )
This Certificate has been issued to confirm that theelectrical installation work to which it relates has been . Designed . Constructed. Inspection & Tested. Etc .

-&-s □ Recall : Minor WorkCertificate . is intended to be used for Additions & Alterations toan installation that do not extend to the provisionof a new circuit . ( MEIWC )

( MWC ) it doeshave boxes for - Earth continuity .Insulation résistance : Polarity : RCDtimes .

2392-10: ( MWC ) . Comments on [ Existinginstallation ] including adequacy of Earthing & bonding arrangements. 132.16

Q) Records of inspections & test resultsshould be kept during the life of an installation . this will enable :
i) identification of defective parts .
ii) deterioration to beidentified .
iii) landlords to carry out repairs .
iv) correct selection of equipment .

 

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Conductof the Inspection & Testing . “ BasicPrinciple “

Q) Visual inspection of a new installation mustbe carried out :
i) after completion of the installation .
ii) after testing .
iii) after erection & before testing .
iv)during erection & on completion .

Visualinspection is extremely important & it shouldalways precede testing . [ Thiswill stand you fast on Periodic Testing ]
Thepurpose of the [ Visual inspection ] is to confirm the following aspects of theinstallation :
i) Equipment complies with standards in accordance with the requirements of BS-7671:2011 .
ii)Equipment is correctly selected & erected . in accordance with theRegulations . taking into account manufactures instructions .
iii) not visibly damaged or defective so as toimpair Safety .

Visualinspection : Inspection . 611.1. /611.3.
Initial Verification :
611.1. Inspection shallprecede testing & shallnormally be done with that part of the installation under inspectiondisconnected from the supply .

SmartMeters : The need for meter installersto [ Visually ] check consumer’s electrical equipment adjacent to the electrical intakeequipment .
Inspectors. to check the adequacy of the earthing arrangement before [ Re-energising the installation ] many existing installations are likely to have inadequate oreven non- existent earthing arrangements.

2392-10: I must Stress this : Tightness of the connection of the [ meter tails ] at the main switch in the Consumer Unit . – [ Loose connections ]

2392-10: Q) Which one of the following tests can only be carried out after the supply is connected :
i) prospective faultcurrent . ( PFC )
ii) insulation résistance . ( dead )
iii) polarity . ( dead )
iv) continuity of protective conductors . ( dead)

Q) The commissioning process takes place “ When “ : A) [ After ] an installation has been inspected &tested .
Let’sopen it up .
Q) When should the commissioning process Not take place . After an installation has been inspected &tested .

 

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2392-10:

p/389. Reminder .

NewWork . [ Initial Verification ]

(EIC ) will indicate the responsibility fordesign . construction . inspection & testing .
-&-. to New workor further work on an Existing installation .

Q) The person who tests & signs the ( EIC) for an electrical installation should be: - &-s [ any Certification &Reporting ]
A) Competent person .

Informative.
i): ii) : iii) :

p/389 . (iv) Competent person. will . as appropriate to their function under [ i) : ii) : iii) ]

(T) 632.4. this a must . Chaps :icon_bs:
Defectsor omissions revealed during inspection & testing of the installation workcovered by the [ Certificate ] shall bemade good before the certificate is issued .


2391-10: You have my Undivided Admiration . You chaps. don’t get the recognition that you. deserve .
Approved Electrician . that to me is a BIG patin the Back .

Yourprofessionalism is OUT standing . -&-s do not do you Justice . “ Approved“

 

[amberleaf]

2392-10:

632.4. Reminder . before an(EIC) isissued . any defects or omissions must be . made good . -&-s

 

[amberleaf]

Methodsof Inspection & Testing are described in Guidance Note : 3

Wherea . 3-core cable . with cores coloured . Brown . Black . Gary . is used as a switch wire for two – wayor intermediate control . the terminations of the conductors shall beidentified using . [ Brown tape on the . Black & Gray cores ]

2392-10: Inspectors . [ Assessor ]
Theneed to comply with the relevant parts of the . Electricity at Work Regulations1989 .
Whenreplacing a Or working on a Consumer Unit .

Regulation12 : Means for cutting off the supply& for isolation .
Regulation13 : Precautions for work on equipment made [ Dead]
Regulation14 : Working on Or near Live conductors .

2392-10: Inspectors
Replacinga [CU] in an existing installation is anAddition Or Alteration to that installation .

Therefore: be designed . erected & Verified in accordance with the requirements of the currentedition BS-7671:2011 .

Inspectors
Mustnot impair the safety of the installation .Regulations 110.1 ( x )
(x ) External lighting & similar installations .
610.4.
Foran Addition or Alteration to an existing installation .it shall be [ Verified ] that the Addition or Alteration complies with the Regulations . & does not impair thesafety of the existing installation .

110.1.1. : Note : “ Premises “ covers the land & allfacilities including buildings belonging to it .
110.1.2. : (vi) Additions& Alterations to the installations & also [ Parts ] of the existinginstallation affected by an Additions& Alterations . 610.4.

 

[amberleaf]

Design& Installation .
Workshould comply with BS-7671:2011

Part M . of the building regulations must be complied with .
Inspection& Testing before taking into service .

BS-7671:2011. does not recognize a kitchen as a special location . PartP does .

TheDomestic Electrical Installation Condition Report .
Isused to report on the safety condition of an existing installation in adomestic situation .

2392-10: ( EIC ) is a declaration of Electrical Safety .

(EIC ) is to be issued to confirm that the electrical installation work to whichit relates has been designed .constructed . inspection & tested in accordance with BS-7671:2011 .
(EIC ) is to beused only for the Initial Certification of a new installation . Or for an Addition orAlteration to an Existing Installation where new circuits have been [ Introduced ] 2392-10 :
ThisCertificate is onlyvalid if accompanied by theSchedule of Inspections & the Scheduleof Test results .

(EICR ) Report is for use when carrying out routine periodic inspection & testingof an existing installation . it is notfor use when Alterations or Additions are made .

DomesticPeriodic Inspection Report .
isfor use when carrying out routine periodic inspection & testing of an existinginstallation . it is not for use when Alterations or Additions are made .

a Schedule of Inspections & Schedule of Testresults should accompany the Domestic Periodic Inspection Report .

(MEIWC ) When an Addition to an electrical installation does not Extend to theinstallation of a new circuit .

(PAT Testing - CoP )
Althoughthere is No requirement in the ( EAWR 1989 ) to keep records of equipment & ofinspections & tests . ( HSE 1974 ) Memorandum of Guidance on theseregulations advises that records of maintenance including tests should be keptthroughout the working life of equipment .

Inspection& Testing .
& without such records dutyholders cannot be certain that theInspection & Testing have actually been carried out .

 

[amberleaf]

Oneof the Fundamental Principles . that 2391-10 . lost marks on was . ◄◄◄
Identifythe simplest of tests . applied in the Regulations & GN-3 .

Theyare only two tests that can apply . PeriodicInspecting & Testing & Initial Verification .

2392-10: Initial Verification . – New Installation - ( EIC ) Exams
2391-10. Periodic Inspection & Testing . ( EICR ) ExistingInstallations .

ConditionReport Inspection Schedule for (Domestic & Similar Premises with up to 100ASupply )
PeriodicInspection & Testing . Exams

p/400: Regulation – 2011 . Note : Thisform is suitable for many types of smaller installation NOT exclusively domestic . 2392-10 ◄◄◄ Wording

2011: Earth electrode for RCDs . ( TT with RCDs ) 2392-10
GN-3: Electrode under test is being used inconjunction with a residual current device the following method of test may be appliedas an alternative to the Earth Electrode résistance test .

Inthese circumstances . Where the electrical resistances to earth are relativelyhigh & precision is NOT required . an Earth Fault LoopImpedance Tester may be Used .

Q) : The test required by regulation to ascertainthat the CPC is correctly connected is called . 612.2.1. Continuityof Protective Conductors . 2392-10

 

[amberleaf]

2392-10:
Both Online & Practical . must be passedto receive City & Guilds Certification .
Practical& Theory assessments . relating tothe Inspection & Testing – of NewInstallation .
A Must??

Safeworking .
- Isolationpractices .
- Use of test equipment .
- Inspection& Testing documentation .

if not sure pair up . Testingon the Boards . ►► Make Sure that youfill in the Certificates fully . :banghead: :13:

CalibrationCertificates . last for a Year .
Testinstruments must . therefore . be tested & [ Recalibrated] each year .

Testresults are to be [ Valid ] the instrument must also carry a CalibrationCertificate . This will go onto your Certificates / Model number .

2392-10: -&-s .make no discrimination . on matters . Certification of ElectricalInstallations . being!! Testing & Verification .

Howto [ Code ] electrical Inspection items . completeCertificates . ( EICR / Codes ) p/397 . Exams – C1 : C2 : C3 :

 

[amberleaf]

Q) The legal responsibilities of an Inspector .
Q) The general requirements of BS-7671: relating to Initial Verification .
Q) The inspection process & testing requirementsfor New Installation(s)

-&-s. Which [ Certificate ] to use & when & how to usethem . you will get this on your 2392-10 Exam & Practical Assessments . “ On the Boards “
Completionof ( EIC ) certificate details . this is the Important certificate details . Exams & -&-s .

Electrical Installation Certificate - ( EIC)
Regulation631.1. requires that .upon completion of the [ Verification] of a New Installation. 2392-10 . Domestic Installation .
Domestic electrical work that falls under Part P .Building Regulations .

Or changes to an Existing Installation. GN-3 . shall be provided - Section 632.
632.2 - Uponcompletion of the periodic inspection & testing of an [ Existing Installation ] - ( EICR )

Identification& resolution of common problem .

-&-s. Knowledge necessary to carry outInspection & Testing on New Installations . [ Initial Verification]
p/36 . Verification : All measuresby means of which compliance of the electrical installation with the relevantrequirements of BS-7671 are checked .
Comprising Inspection . Testing & Certification .

Certification . [ Certification & Reporting ] p/195 / 196 . Requirementsfor electrical installation(s)
(EIC ) - ( EICR ) - ( MEIWC )

 

[amberleaf]

Chapsif you think it’s . good will you hit the Thank You Button. Please . Amber :juggle:

 

[amberleaf]

PeriodicTesting . ??

Anyimmediately dangerous condition should preferably be rectified . in not , thedefect should be reported without delay to the employer or responsible employee .
Regulation3 of the EAWR .

Regulation3 . places Duties On .
Employers. employees & the self-employed . tocomply with the Regulations as far as matters are under their control .
Employees. to co-operate with their employer .

Theregulations quantify these responsibilities . by putting them under a legalduty to work in accordance with the requirements of the Regulations .

Definitions:
ElectricalEquipment .
Includesanything used . intended to be used or installed for use . to generate .provide . transmit . transform . rectify . covert . conduct , distribute .control . store . measure or use electrical energy .

System:
Coversall & any electrical equipment which is . or may be . connected to anelectrical energy source . & includes that source .

 

[amberleaf]

• Whichof the following IP Codes signifies protection against total immersion inwater: this Q) comes up a lot .

( An “ X “ isused for one of the digits if there is only one class of protection ) Example . Use IPX4 - which addresses moisture résistance only . 2392-10 .
[ Each ] digit represents an [ Individual level of Protection ]

IP ] Ingress Protection Rating.
X ] which addressesmoisture résistance only
4 ] Protected against splashing water .

 

[amberleaf]

2392-10: let’s look at it another way . “ Client’s Need’s “
Imust stress . Emphasising that the “ Client “ as the customer is the main influence of any . [ re-wires ] “ Client “ requirements need tobe satisfied .

Hi Bruce

 

[brucelee]

Hi mate IPX8 continous immersion IPX7 temporary immersion sorry mate couldnt resist just to let you know i was reading lol