bs7671 2015 outcomes 6 - legh richardsonleghrichardson.co.uk/electricalpresentations/bs7671 17th...

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BS7671 2015 Outcomes 6BS7671 2015 Outcomes 6•• Inspection and testing Inspection and testing

–– 6.1 Identify the general requirements for inspection and testing6.1 Identify the general requirements for inspection and testing of installations of installations

–– 6.2 State the need for diagrams, charts or tables to be availabl6.2 State the need for diagrams, charts or tables to be available prior to the e prior to the verification process. verification process.

–– 6.3 Identify the items to be checked during the inspection proce6.3 Identify the items to be checked during the inspection process. ss.

–– 6.4 State the tests which may need to be carried out on initial 6.4 State the tests which may need to be carried out on initial verification* verification*

–– 6.5 Compare test results with relevant criteria 6.5 Compare test results with relevant criteria

–– 6.6 State the requirements for the issue of 6.6 State the requirements for the issue of •• a Electrical Installation Certificate a Electrical Installation Certificate •• b Minor Works Certificate b Minor Works Certificate •• c Periodic Inspection Report. c Periodic Inspection Report.

*Detailed testing procedures are not covered in this qualificati*Detailed testing procedures are not covered in this qualification as this is detailed on as this is detailed within the City & Guilds Level 2 Certificate in fundamental inspwithin the City & Guilds Level 2 Certificate in fundamental inspection, testing and ection, testing and initial verification (2392initial verification (2392--10). 10).


Part 6: Inspection and TestingPart 6: Inspection and Testing

610 Initial Verification

A skilled person or a person competent in such work


Part 6: Inspection and TestingPart 6: Inspection and Testing611 Inspection611 Inspection•• 611.1 Inspection precedes testing with the supply turned off611.1 Inspection precedes testing with the supply turned off•• 611.2 Inspection to verify:611.2 Inspection to verify:1.1. Equipment and accessories complies with a standard/sEquipment and accessories complies with a standard/s2.2. Correctly selected and erectedCorrectly selected and erected3.3. Not visibly damagedNot visibly damaged•• 611.3 seventeen items to inspect including:611.3 seventeen items to inspect including:1.1. Connections and identification of conductorsConnections and identification of conductors2.2. Routing of cablesRouting of cables3.3. selection of cablesselection of cables4.4. PolarityPolarity5.5. Fire barriersFire barriers6.6. Protection against electric shockProtection against electric shock7.7. Labeling, diagrams, instructions and chartsLabeling, diagrams, instructions and charts


Part 6: Inspection and TestingPart 6: Inspection and Testing612 Sequence of testing612 Sequence of testing1.1. Continuity of protective conductors (including main Continuity of protective conductors (including main equipotentialequipotential bonding)bonding)2.2. Continuity of ring final circuitContinuity of ring final circuit3.3. Insulation resistanceInsulation resistance4.4. Protection by SELV, PELV or separationProtection by SELV, PELV or separation5.5. FELV systemsFELV systems6.6. Barriers and enclosures to IP2X, IPXXB, IP4X, IPXXDBarriers and enclosures to IP2X, IPXXB, IP4X, IPXXD7.7. Insulation resistance of Floors and WallsInsulation resistance of Floors and Walls8.8. PolarityPolarity9.9. Earth Electrode resistanceEarth Electrode resistance10.10. Protection by Automatic DisconnectionProtection by Automatic Disconnection11.11. Earth Fault Loop ImpedanceEarth Fault Loop Impedance12.12. Additional ProtectionAdditional Protection13.13. Prospective Fault CurrentProspective Fault Current14.14. Check Phase SequencingCheck Phase Sequencing15.15. Functional TestingFunctional Testing16.16. Verification of Volt DropVerification of Volt Drop


Part 6: Inspection and TestingPart 6: Inspection and Testing612.2 Continuity of protective conductors612.2 Continuity of protective conductors

•• Low reading Ohmmeter; Instrument capability 4 Low reading Ohmmeter; Instrument capability 4 –– 24V 24V •• at at 200mA short circuit current200mA short circuit current•• Method 1 Method 1 –– Long Lead methodLong Lead method

•• Method 2 Method 2 –– Link out and measure at accessoriesLink out and measure at accessories

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Part 6: Inspection and TestingPart 6: Inspection and Testing•• 612.2.2 Ring Final circuit testing612.2.2 Ring Final circuit testing

Spur from FCU

Spur from Socket on Ring

Spur from JB (must be accessible for inspection)

Spur from Origin

Double Link method


Part 6: Inspection and TestingPart 6: Inspection and TestingInspection, Testing and Certification (Part 6)Inspection, Testing and Certification (Part 6)

Insulation Resistance Testing requires higher values of Insulation Resistance Testing requires higher values of Resistance between conductorsResistance between conductorsInsulation Resistance test between :Insulation Resistance test between :P/N P/N –– PE, P PE, P –– PE, N PE, N –– PE, P PE, P –– NNResults must be greater than those given in Table 61Results must be greater than those given in Table 61

SELV,PELV 250V 0.25M

LV <500V 500V 0.5M

LV >500V 1000V 1.0M

System Volts Test Volts 16th Ed.Min. 17th Ed.Min.0.5M

1.0M

1.0M


Part 6: Inspection and TestingPart 6: Inspection and Testing•• 612.6 Polarity Testing612.6 Polarity Testing•• Verify that all functional and protective switching for single Verify that all functional and protective switching for single

pole devices switches in the line conductor onlypole devices switches in the line conductor only•• Fuses and Circuit BreakersFuses and Circuit Breakers•• Functional SwitchesFunctional Switches•• Line conductor connected to the centre contact in ES Line conductor connected to the centre contact in ES

fittings (exception being E14 and E27 ES)fittings (exception being E14 and E27 ES)•• Socket outlets and Socket outlets and SFCUSFCU’’ss

•• 612.12 Phase (Line) Rotation612.12 Phase (Line) Rotation–– Three phase machinery requires the phases to be ordered due to Three phase machinery requires the phases to be ordered due to

direction of rotationdirection of rotation


Part 6: Inspection and TestingPart 6: Inspection and Testing•• Automatic Disconnection of SupplyAutomatic Disconnection of Supply•• Three main systems covered TN, TT, ITThree main systems covered TN, TT, IT•• TN and TTTN and TT

1.1. Earth Fault Loop ImpedanceEarth Fault Loop Impedance2.2. Effectiveness of OPDEffectiveness of OPD3.3. RCD inspect and manual testRCD inspect and manual test4.4. RCD times to comply with additional protectionRCD times to comply with additional protection5.5. Verification of Disconnection timesVerification of Disconnection times

•• IT SystemsIT Systems

1.1. 612.4.3, 612.8.1.c612.4.3, 612.8.1.c Two simultaneous faults where there is more than Two simultaneous faults where there is more than one separated circuit connected to more than electrical equipmenone separated circuit connected to more than electrical equipment t causing an earth fault to exposed/extraneous conductive parts mucausing an earth fault to exposed/extraneous conductive parts must be st be able to disconnect within the times stated for TN systemsable to disconnect within the times stated for TN systems

2.2. Measurement of first and second fault conditionsMeasurement of first and second fault conditions



RCM RCM

Must disconnect on 2nd fault -dangerous

Warns and Trips on first fault

N


Part 6: Inspection and TestingPart 6: Inspection and Testing•• Prospective Fault currentsProspective Fault currents

1.1. Prospective Short Circuit CurrentProspective Short Circuit Current2.2. Prospective Earth Fault CurrentProspective Earth Fault Current3.3. Test at the origin for the maximum values and at other relevant Test at the origin for the maximum values and at other relevant points points

in the installationin the installation

•• Use the greater of the two values obtained and compare with the Use the greater of the two values obtained and compare with the lowest lowest breaking capacity of the protective devices at each point of meabreaking capacity of the protective devices at each point of measurementsurement

•• Three phase supplies may need to measured as a single phase suppThree phase supplies may need to measured as a single phase supply and ly and multiplied by (multiplied by (××2)2)

•• Function TestingFunction Testing•• RCD Test buttonRCD Test button•• MCBsMCBs•• Functional switchingFunctional switching•• Contactors,Contactors,•• Emergency switchingEmergency switching•• Timers and automatic control systemsTimers and automatic control systems

•• Volt Drop verificationVolt Drop verification



•• Formula to find the actual Volt Drop when the cable is Formula to find the actual Volt Drop when the cable is known: known: -- App 4. 6App 4. 6

1000LIm/A/mVD.V B

Act

Volt drop check by measuring the volt drop while Volt drop check by measuring the volt drop while the load is connected and on and measure at:the load is connected and on and measure at:

The supplyThe supply The loadThe load The difference being the actual volt dropThe difference being the actual volt drop


Part 6: Inspection and TestingPart 6: Inspection and Testing612.14 Verification of volt drop by Measurement of the circuit i612.14 Verification of volt drop by Measurement of the circuit impedance mpedance

or by calculationor by calculationExample:Example:The measured The measured ZZlineline for a 9.5kW radial shower unit supplied by a 20m length of for a 9.5kW radial shower unit supplied by a 20m length of

10mm10mm22 twin and earth cable is 0.3twin and earth cable is 0.3. The measured external . The measured external ZZlineline is 0.21is 0.21. . check the volt drop acceptability for the circuit and verify by check the volt drop acceptability for the circuit and verify by calculationcalculation

1/ 1/ ZlZl = Zle+R1+Rn= Zle+R1+Rn(R1+Rn = (R1+Rn = ZlZl –– ZleZle))

2/ R1+Rn by calculation2/ R1+Rn by calculation((VdVd = Ib(R1+Rn)= Ib(R1+Rn)

3/Volt drop formula3/Volt drop formula

v.%UoVDAllowedMaximum

V...M)RnR(IbVd

A.UoPIb;...RnR

51151002305

69309003411

0341230

9500090210301

V...)RnR(IbVd

....RnR

60308761003411

087020211000

8318311

V61.31000

2003.414.41000

LIbm/A/mVVD



ExampleExample1.1. Check that 45m of 1.5mm2 twin and Check that 45m of 1.5mm2 twin and

earth cable is suitable for volt drop. earth cable is suitable for volt drop. Assume a loading of 66% of In at 10AAssume a loading of 66% of In at 10A

2.2. What would be the maximum theoretical What would be the maximum theoretical loading for compliance with volt Drop loading for compliance with volt Drop using the same parameters in 1.?using the same parameters in 1.?


Part 6: Inspection and TestingPart 6: Inspection and Testing•• Forms changed to reflect changes in definitions Forms changed to reflect changes in definitions •• Requirement now that documentation is produced for all Requirement now that documentation is produced for all

Installations Installations (132.13)(132.13)•• Establishing greater maintainability of installationsEstablishing greater maintainability of installations

–– Portable Appliance testing not within the scopePortable Appliance testing not within the scope

–– DocumentationDocumentation–– Provision of manuals and manufacturers data sheet must be Provision of manuals and manufacturers data sheet must be

included as part of the completion process 610.6, 611.3, 631.1included as part of the completion process 610.6, 611.3, 631.1--5, 5, 514514

–– 631.1 631.1 –– 5 Certification5 Certification–– Multiple signatories: Design, Construction and Inspection and TeMultiple signatories: Design, Construction and Inspection and Testst–– Single Signature: For all aspects, usually small InstallationsSingle Signature: For all aspects, usually small Installations–– Minor Works Signatory: Where no circuits have been addedMinor Works Signatory: Where no circuits have been added


Part 6: Inspection and TestingPart 6: Inspection and TestingPeriodic Inspection and TestPeriodic Inspection and Test•• 621.2 Non621.2 Non--invasive techniques for inspection and testing invasive techniques for inspection and testing

preferred preferred

•• Verification of disconnection times as stated in 411Verification of disconnection times as stated in 4111.1. Safety of persons and livestockSafety of persons and livestock2.2. Protection against damage to propertyProtection against damage to property3.3. Confirm that installation has not degraded as to effect safe Confirm that installation has not degraded as to effect safe

operationoperation4.4. Identify defects that are likely to cause dangerIdentify defects that are likely to cause danger

•• Verification of Volt DropVerification of Volt Drop1.1. By measurement under load ( measure at the origin and at the loaBy measurement under load ( measure at the origin and at the load d

for each circuit)for each circuit)2.2. By calculation from known factorsBy calculation from known factors


BS 7671 2008 AMD 3 2015BS 7671 2008 AMD 3 2015

Special Locations or installations


Part 7: Special LocationsPart 7: Special LocationsThe scope of special locations includesThe scope of special locations includes•• 701: Locations containing a bath or shower701: Locations containing a bath or shower•• 702: Swimming Pools and Other Basins702: Swimming Pools and Other Basins•• 703: Rooms and Cabins containing Sauna Heaters703: Rooms and Cabins containing Sauna Heaters•• 704: Construction and Demolition Sites704: Construction and Demolition Sites•• 705: Agricultural and Horticultural Premises705: Agricultural and Horticultural Premises•• 706: Conductive locations with restrictive movement706: Conductive locations with restrictive movement•• 708: Electrical Installations in Caravan/Caravan Parks and simil708: Electrical Installations in Caravan/Caravan Parks and similar locationsar locations•• 709: Marinas and similar locations709: Marinas and similar locations•• 710: Medical Locations710: Medical Locations•• 711: Exhibitions Shows and Stands711: Exhibitions Shows and Stands•• 712: Solar Photovoltaic (PV) Power Supply Systems712: Solar Photovoltaic (PV) Power Supply Systems•• 714: Outside lighting714: Outside lighting•• 715: ELV systems715: ELV systems•• 717: Mobile or Transportable Units717: Mobile or Transportable Units•• 721: Electrical Installations in Caravans and Motor Caravans721: Electrical Installations in Caravans and Motor Caravans•• 722: Electric vehicle charging722: Electric vehicle charging•• 729: Operating and Maintenance gangways729: Operating and Maintenance gangways•• 740: Electrical Installations in Fairgrounds, Amusement Parks an740: Electrical Installations in Fairgrounds, Amusement Parks and Circusesd Circuses•• 753: Floor and Ceiling Heating Systems 753: Floor and Ceiling Heating Systems


Part 7: Special LocationsPart 7: Special Locations•• These are deemed to be These are deemed to be ““specialspecial”” because of because of

the greater risks associated withthe greater risks associated with1.1. the presence of water, anaesthetics, the presence of water, anaesthetics, 2.2. Low body resistance, low insulationLow body resistance, low insulation3.3. Outside zones of Outside zones of equipotentialequipotential Bonding, High touch Bonding, High touch

VoltagesVoltages4.4. Access to the general public, unawarenessAccess to the general public, unawareness5.5. Farm animals and the effects of electric shock Farm animals and the effects of electric shock 6.6. Handheld machines (construction sites)Handheld machines (construction sites)7.7. Multiple electrical sources of energyMultiple electrical sources of energy8.8. Movement, salt water, environmentalMovement, salt water, environmental9.9. (restrictive movement, associated with access and (restrictive movement, associated with access and

service tunnelsservice tunnels10.10. High breaking capacities and flashoverHigh breaking capacities and flashover


Part 7. Special LocationsPart 7. Special Locations

YYYYYYYYYYYYYY729729YYYYYYYYYYYYYY740740

YYYYYYYYYYYYYY717717YYYYYYYYYYYY721721

LocationLocation SeparationSeparation SELVSELV Double InsDouble Ins ADS RCDADS RCD HeatHeat IP44/5IP44/5 FlashFlash701701 YY YY YY YY YY YY702702 YY YY YY YY YY703703 YY YY YY704704 YY YY YY YY YY YY705705 YY YY YY YY YY YY YY706706 YY YY YY YY YY YY708708 YY YY YY YY YY YY YY709709 YY YY YY YY YY YY710710 YY YY YY YY YY YY YY711711 YY YY YY YY YY YY YY712712 YY YY YY YY YY YY YY714714 YY YY YY YY YY YY YY715715 YY YY YY YY YY YY YY

722722 YY YY YY YY YY YY YY

753753 YY YY YY YY YY YY YY


Part 701. Special LocationsPart 701. Special LocationsAt a GlanceAt a Glance•• Socket outlets now permitted in bathrooms, (conditionally)Socket outlets now permitted in bathrooms, (conditionally)•• No socket outlet within 3 meters of the edge of Zone 1No socket outlet within 3 meters of the edge of Zone 1•• Must be protected by RCDMust be protected by RCD•• All circuits in Bathrooms and shower rooms to be protected All circuits in Bathrooms and shower rooms to be protected

by RCD this includes under floor heating elements)by RCD this includes under floor heating elements)•• All current using equipment must be suitable for the Zone All current using equipment must be suitable for the Zone

or environment, lighting, electric showers, wall heaters, or environment, lighting, electric showers, wall heaters, heated mirrors etc.heated mirrors etc.

•• Detachable shower heads extend zone 2 from 0.6m to Detachable shower heads extend zone 2 from 0.6m to 1.2m (this still applies) 1.2m (this still applies)

•• Wet room zone 1 replaces zone 2 to the full 1.2mWet room zone 1 replaces zone 2 to the full 1.2m


Part 701. Special LocationsPart 701. Special LocationsBathrooms and showers ZonesBathrooms and showers Zones

Shower with permanently fixed partition

Fixed bath tub


Part 701. Special LocationsPart 701. Special LocationsProtection from Electric ShockProtection from Electric Shock

(415.1.1)

701.415 Additional Protection

Supplementary equipotential bonding to be applied to circuit cpcs and accessible extraneous conductive parts. Including:

1. Metallic service pipes

2. Metallic air conditioning and central heating pipework

3. Accessible structural steelwork,

Supplementary bonding can be placed in or adjacent to the bathroom / shower room area (ie airing cupboard next door)

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Part 701. Special LocationsPart 701. Special LocationsExisting methods of complianceExisting methods of compliance•• EEBADS via EEBADS via cpccpc•• Cross bonding Cross bonding cpcscpcs and extraneous and extraneous

metalwork (increasing R2 metalwork (increasing R2 csacsa and reducing and reducing touch voltage)touch voltage)

•• RCD additional (supplementary) protectionRCD additional (supplementary) protection•• SELV extra low voltage systemsSELV extra low voltage systems•• Separation (Shaver Sockets)Separation (Shaver Sockets)


Part 7. Special LocationsPart 7. Special Locations

New methods 701.415.2New methods 701.415.2Supplementary Supplementary equipotentialequipotential bonding bonding MAYMAY be be

omitted if omitted if ALLALL of the following conditions apply:of the following conditions apply:1.1. All final circuits comply with the conditions of All final circuits comply with the conditions of

411.3.2 (automatic disconnection 0.4s 411.3.2 (automatic disconnection 0.4s -- TN, 0.2s TN, 0.2s --TT) ADSTT) ADS

2.2. All final circuits serving the location or/and All final circuits serving the location or/and passing through zones 1 and 2 of that location will passing through zones 1 and 2 of that location will have additional protection 701.411.3.3, 415.1.1 (30 have additional protection 701.411.3.3, 415.1.1 (30 mAmA RCD protected)RCD protected)

3.3. All extraneous conductive parts are connected to All extraneous conductive parts are connected to the protective the protective equipotentialequipotential bonding (This now bonding (This now requires you to measure the effective resistances requires you to measure the effective resistances of the metallic of the metallic pipeworkpipework -- GN5, GN8)GN5, GN8)


Part 701. Special LocationsPart 701. Special Locations415.2.2 simultaneous accessible extraneous parts can be verified415.2.2 simultaneous accessible extraneous parts can be verified by by

s'RCDIs'OPDIaI

V50orIa

V50R NN

All circuits in Bathrooms must be protected by an RCD individualAll circuits in Bathrooms must be protected by an RCD individually or in groupsly or in groupsMain requirement is that main Main requirement is that main equipotentialequipotential bonding is in place and additional bonding is in place and additional protection by 30mA RCD/RCBO for all or each circuit in a bathrooprotection by 30mA RCD/RCBO for all or each circuit in a bathroom or shower m or shower room. This can be supplemented by localized cross bonding.room. This can be supplemented by localized cross bonding.

BS EN 61008 BS EN 61008 EN 61009EN 61009

30mA30mA 50/10mA50/10mA 1667/51667/5,000 ,000

23,00023,000 0.040.04

BS EN 60898BS EN 60898 6A6A 30A30A 1.671.67 23,00023,000 0.2 or 0.40.2 or 0.4

BS 88BS 88 6A6A 17A17A 2.942.94 23,00023,000 0.2 or 0.40.2 or 0.4

BS 1361BS 1361 5A5A 14A14A 3.573.57 23,00023,000 0.2 or 0.40.2 or 0.4

BS 3036BS 3036 5A5A 13A13A 3.853.85 23,00023,000 0.2 or 0.40.2 or 0.4

OPD or RCDOPD or RCD App 3 t/A graphsApp 3 t/A graphs415.2415.2

Max Max OhmsOhms

GN 5 / GN 5 / GN8GN8

Max. timeMax. timeSecsSecs

ProtectionProtection

RCDRCD

EEBADS Touch EEBADS Touch VoltageVoltage

EEBADS Touch EEBADS Touch VoltageVoltageEEBADS Touch EEBADS Touch VoltageVoltageEEBADS Touch EEBADS Touch VoltageVoltage


Part 701. Special LocationsPart 701. Special LocationsBathrooms and ShowersBathrooms and Showers

Minimum Protection = IPX4, exposed to water jets = IPX5

701.512.3 Switch gear1. Zone 0 = no switch gear2. Zone 1 = SELV switches and socket outlets3. Zone 2 = SELV switches and Socket Outlets, shaver sockets (separated)

Socket Outlets are prohibited within 3 m of the boundary of zone 1

bs7671 2015 outcomes 6 - legh richardsonleghrichardson.co.uk/electricalpresentations/bs7671 17th...

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