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8/10/2019 2391- Certification & Inspection Overview
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nspection Testnspection TestOverviewverview
ElectaCourse.com
2005 Last Updated August 2006
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Why does an electrical installationrequire Inspection and Testing ?
BS 7671:2001
711711 --0101 --01 Every installation shall, during01 Every installation shall, duringerection and on completionerection and on completion before beingbefore beingput into serviceput into service be inspected and tested tobe inspected and tested toverify, so far as is reasonably practicable,verify, so far as is reasonably practicable,
that the requirements of the Regulationsthat the requirements of the Regulationshave been methave been met
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Before being put into service
It It s ok misses we've finished the electric's,s ok misses we've finished the electric's,we've put the supply onwe've put the supply on .. be back next be back next
week to test it week to test it
Simple: If it has not been inspected and tested,it should not be energised.
No discussionNo discussion -- No connection!No connection!
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712-01-01 Inspection
The inspection shall be made to verifythat the installed electrical equipment is:
(i) in compliance with Section 511compliance with standards -
British Standards or, HarmonizedStandard
(ii) correctly selected and erected inaccordance with the Regulations
(iii) not visibly damaged or defective so as toimpair safety
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Certification
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Every Inspection and Test mustbe recorded on the appropriate
certificate
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The Installation Certificate
Where do I use it?
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For new installations
For alterations or additions thatinclude a new circuit
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The Installation Certificate
what does it consist of?
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Details of client
Installation address - Must include postcode
Description and extent of the installation
Signatories those with a responsibility for (i) The design(ii) The construction
(iii) The inspection and testing Recommend date for next inspection
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Who recommends the date for the nextinspection (Periodic) ?
THE DESIGNER
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Who recommends the date for subsequentinspections and tests (Periodic) ?
THE INSPECTOR
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SUPPLY CHARACTERISTICS
AND EARTHING ARRANGEMENTS
TN-C (of specialist nature)
TN-S TN-C-S TT
IT (of specialist nature)
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Number and type of live conductors
whether the supply is a.c. or d.c. number of phases number of poles
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Nature of Supply Parameters
nominal voltage U/Uo (V) Fixed
nominal frequency, f (Hz) Fixed
external loop impedance Z e ( )
prospective fault current, I pf (kA)
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Prospective Fault Current ( Ipf ) kA
May be obtained by
Measurement Calculation
Enquiry Public Electricity Supply (PES)
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External loop impedance Ze
May be obtained by
Measurement Calculation
Enquiry
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Supply Protective DeviceCharacteristics (PES)
Type i.e. BS 1361 Type 2, BS 88 Nominal current rating (A)
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Particulars of installation referredto in the certificate
Means of earthing
Maximum demandMaximum demand (Not rating of (Not rating of serviceservice head fuse)head fuse)
Details of earth electrode resistanceDetails of earth electrode resistanceif applicableif applicable
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Review - Characteristics of Supply
313-01-01 The following characteristicsof the supply or supplies, from whatever source shall be determined bycalculation, measurement, enquiry or inspection
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The nominal voltage/s
The nature of the current and frequency
The prospective short circuit current
Earth fault loop impedance Ze
Maximum demand after diversity
Type and rating of overcurrent device at theorigin of the installation
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Main Protective Conductors
Earthing Conductor
Material Cu - copper etc
c.s.a
Connection verified(low resistance ohmmeter)
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Main Equipotential Bonding Conductors
Material Cu - copper etc
c.s.a
Connection verified
(low resistance ohmmeter recommendedmaximum value 0.05 )
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www.ElectaCourse.comBS /BS EN Number Number of PolesCurrent Rating
Voltage Rating
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Main Switch or Circuit Breaker
BS Type and Number of Poles
Current rating (A)
Voltage rating Fuse rating or setting
Location
RCD I n (mA) and operating time (mS)at I n
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Comments on Existing Installation
To be used for alterations or additions
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Schedule of items inspected
Refer to Schedule
Common to both Installation&
Periodic Inspection Report
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The Visual Inspection
Chapter 71 Initial Verification
Footnote to Regulation 711-01-01
Precautions shall be taken to avoiddanger to persons and to avoid damageto property and installed equipment
during inspection and testing
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The Visual Inspection
712 Inspection
Inspection shall precede testing and
shall normally done with that part of theinstallation under inspectiondisconnected from the supply
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Test equipment to GS 38
Probes 4mm max pref 2mm max
Fused Leads
Finger Guards
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Schedule of Test Results
Refer to Schedule
Common to both Installation&
Periodic Inspection Report
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Periodic Inspection Report (PIR)
Change of use or ownership As a result of damage. Fire - Flood etc Electrical overloading
To ensure compliance/continuedcompliance with the Regulations
Mortgage/Insurance request
Local bylaws - Places of publicentertainment - Theatres/Cinemas etc
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Periodic Inspection Report (PIR)
Some areas common to InstallationCertificate, i.e.
Details of client and installation
Recommended next inspection date Signature of competent person
Supply characteristics
Particulars of installation
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(PIR) continued
Schedule of inspection
Schedule of test results
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Major Differences
Estimated age of installation?
Evidence of alterations or additions?
Are there records available?
Extent and limitations
Observations and recommendations
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Extent and Limitations
ExtentExtent -- Details indicating what part/sDetails indicating what part/sof the installation will be inspected andof the installation will be inspected andtestedtested
Limitations - State exactly what itemsare excluded, i.e. portable appliances,fire alarm systems, emergency lighting,cctv, door entry systems, smokedetectors etc.
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Numerical codeNumerical code
Departures from BS 7671 must be allocateda numerical code
1. requires urgent attention
2. Requires improvement
3. Requires further investigation
4. Does not comply with BS 7671 -imply that installation is unsafe
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Minor Works
An alteration or addition to an existing
installation that does not include the additionof a new circuit, i.e. spur to radial or ringcircuit etc.