2391- certification & inspection overview

8/10/2019 2391- Certification & Inspection Overview

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www.ElectaCourse.com

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.

2391- certification & inspection overview

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