1. Inspection & Test
Overview
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2. Why does an electrical installation require Inspection and Testing?
BS 7671:2001
Every installation shall, during
erection and on completion before being
put into service be inspected and tested to
verify, so far as is reasonably practicable,
that the requirements of the Regulations
have been met
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3. Before being put into service
“It’s ok misses we've finished the electric's,
we've put the supply on”. “be back next
week to test it”
Simple: If it has not been inspected and tested,
it should not be energised.
No discussion - No connection!
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4. The inspection shall be made to verify
that the installed electrical equipment is:
(i) in compliance with Section 511
compliance with standards -
British Standards or, Harmonized
Standard
(ii) correctly selected and erected in
accordance with the Regulations
(iii) not visibly damaged or defective so as to
impair safety
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5. Certification
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6. Every Inspection and Test must be recorded on the appropriate
certificate
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7. The Installation Certificate
“Where do I use it?”
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8. include a new circuit For new installations
For alterations or additions that
include a new circuit
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9. The Installation Certificate
“what does it consist of?”
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10. Installation address - Must include post code
Details of client
Installation address - Must include post
code
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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11. THE DESIGNER Who recommends the date for the next
inspection (Periodic) ?
THE DESIGNER
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12. THE INSPECTOR Who recommends the date for subsequent
inspections and tests (Periodic) ?
THE INSPECTOR
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13. SUPPLY CHARACTERISTICS AND EARTHING ARRANGEMENTS
TN-C (of specialist nature)
TN-S
TN-C-S TT
IT (of specialist nature)
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14. 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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15. Nature of Supply Parameters
nominal voltage U/Uo (V) Fixed
nominal frequency, f (Hz) Fixed
prospective fault current, Ipf (kA)
external loop impedance Ze ()
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16. Prospective Fault Current (Ipf) kA
May be obtained by
Measurement
Calculation
Enquiry Public Electricity Supply (PES)
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17. External loop impedance Ze
May be obtained by
Measurement
Calculation
Enquiry
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18. Supply Protective Device Characteristics (PES)
Type i.e. BS 1361 Type 2, BS 88
Nominal current rating (A)
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19. Particulars of installation referred
to in the certificate
Means of earthing
Maximum demand (Not rating of
service head fuse)
Details of earth electrode resistance
if applicable
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20. Review - Characteristics of Supply
The following characteristics
of the supply or supplies, from whatever
source shall be determined by
calculation, measurement, enquiry or inspection
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21. The nature of the current and frequency
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 the
origin of the installation
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22. Main Protective Conductors
Earthing Conductor
Material Cu - copper etc
c.s.a
Connection verified
(low resistance ohmmeter)
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23. Main Equipotential Bonding Conductors
Material Cu - copper etc
c.s.a
Connection verified
(low resistance ohmmeter recommended
maximum value 0.05)
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24. BS /BS EN Number Number of Poles Current Rating Voltage Rating
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25. 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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26. Comments on Existing Installation
To be used for alterations or additions
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27. Schedule of items inspected
Refer to Schedule
Common to both Installation
&
Periodic Inspection Report
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28. The Visual Inspection Footnote to Regulation 711-01-01
Chapter 71 Initial Verification
Footnote to Regulation
Precautions shall be taken to avoid
danger to persons and to avoid damage
to property and installed equipment
during inspection and testing
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29. The Visual Inspection 712 Inspection
Inspection shall precede testing and
shall normally done with that part of the
installation under inspection
disconnected from the supply
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30. Safe Isolation Test equipment to GS 38 Fused Leads Finger Guards
Probes 4mm max pref 2mm max
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31. Schedule of Test Results
Refer to Schedule
Common to both Installation
&
Periodic Inspection Report
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32. Periodic Inspection Report (PIR)
Change of use or ownership
As a result of damage. Fire - Flood etc
Electrical overloading
To ensure compliance/continued
compliance with the Regulations
Mortgage/Insurance request
Local bylaws - Places of public
entertainment - Theatres/Cinemas etc
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33. Periodic Inspection Report (PIR)
Some areas common to Installation
Certificate, i.e.
Details of client and installation
Recommended next inspection date
Signature of competent person
Supply characteristics
Particulars of installation
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34. Schedule of inspection
(PIR) continued
Schedule of inspection
Schedule of test results
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35. 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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36. Extent and Limitations
Extent - Details indicating what part/s
of the installation will be inspected and
tested
Limitations - State exactly what items
are excluded, i.e. portable appliances,
fire alarm systems, emergency lighting,
cctv, door entry systems, smoke
detectors etc.
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37. Departures from BS 7671 must be allocated a numerical code
1. requires urgent attention
2. Requires improvement
3. Requires further investigation
4. Does not comply with BS
imply that installation is unsafe
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38. Minor Works
An alteration or addition to an existing installation that does not include the addition of a new circuit, i.e. spur to radial or ring circuit etc.
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