City & guilds 2391 courses and training

027888

Inspection, Testing and
Certification
of
Electrical Installations

Scheme 2391-10 - Course Synopsis

Issue 3.1 Prepared by Trans-Euro Engineering Services Ltd

© Trans-Euro Engineering Services Ltd - Consultancy, Training & Power Quality
www.trans-euro.co.uk +44 (0) 1327 353 800

City & Guilds 2391-10 Synopsis

Contents

Rationale for City & Guilds 2391-10 Three-Day Course..............................................3
Course Framework......................................................................................................3
Administrative Arrangements ......................................................................................4
Safety Warning............................................................................................................4
Equal Opportunities.....................................................................................................4
Trans-Euro Staff ..........................................................................................................4
Complaints and Appeals .............................................................................................5
Disclaimer....................................................................................................................5
Data Protection............................................................................................................5
Syllabus.......................................................................................................................5
1. Practical..................................................................................................................5
2. Underpinning Knowledge .......................................................................................6
2.1 Preparation for inspection and testing: .................................................................6
2.2 Inspection .............................................................................................................6
2.3 Testing..................................................................................................................7
Assessments ...............................................................................................................9
Exam booking time....................................................................................................10
Publication of results .................................................................................................10

Version: Issue 3.1 Page 2 of 10
© Trans-Euro Engineering Services Ltd. Tel +44 (0) 1327 353800


Rationale for City & Guilds 2391-10 Three-Day Course

The City & Guilds 2391-10 course for electricians provides a comprehensive review of the
latest edition of the wiring regulations (BS7671:2008, 17th Edition) with practical
demonstrations.

This qualification is intended for experienced personnel working in the electrical industry.
Although City & Guilds does not state formal candidate entry requirements, the qualification
is not intended for non-qualified electricians and/or those who do not have experience in
inspecting, testing and certifying electrical installations.

Candidates without this experience should seriously consider undertaking the City & Guilds
Level 2 Certificate in Fundamental Inspection, Testing and Initial Verification, 2392-10, as
well as obtaining industry experience. It is also strongly recommended that candidates have
achieved either the City & Guilds 2382 Certificate in The Requirements for Electrical
Installations, BS 7671:2008, or similar qualifications where candidates have demonstrated
knowledge and understanding of the 17th edition wiring regulations.

The 2½-hour written exam is set and marked by City & Guilds. It will be run by Trans-Euro
from 18:00 onwards on a date set by City & Guilds.

The 4-hour practical exam is conducted one-to-one between the Assessor and each
candidate, at a time to be arranged when mutually convenient. The format and content of this
is set by City & Guilds. It can be undertaken before or after the written exam.

Candidates are expected to bring their own, up-to-date, copies of:

• The IET On-Site Guide.
• BS7671 (the “Wiring Regs”).
• IET Guidance Note 3, Inspection & Testing.

Although there will be tools and test equipment available, it is preferable that candidates
bring their own as well.

Course Framework

The course is divided into 4 basic sections:

• Legislation.
• Overview of BS7671.
• Inspection & Testing Theory.
• Practical demonstrations.

Opportunities will be provided during the course, and with homework, to practise exam
technique.

The major documents that need to be studied thoroughly are BS 7671 and the IET Guidance
Note 3, supported by the IET On-Site Guide. These documents will be constantly referred to
and used throughout the course. It cannot be stressed too highly that candidates
require a thorough working knowledge of these documents in order to pass the
closed-book exam and the practical assessment.


Administrative Arrangements

The course, the written exam and the practical assessment are normally held at Trans-Euro’s
premises at 186 Watling Street, Towcester, but the location can be at client premises by prior
arrangement.

Normal times of attendance are from 09:00 to 17:00, with lunch from 12:15 to 13:00.

Refreshment breaks are taken as necessary during the mornings and afternoons.

Towcester is centrally placed and is conveniently accessible by road, rail and air.
Accommodation and parking are easily arranged. Full details are available from the Course
Secretary.

Participants with special needs should advise the Course Secretary 21 days before the start
of the course.

Safety Warning

Note that the Trans-Euro emergency assembly area is the Magistrate’s Court car park,
across the main A5 Watling Street. This is a busy trunk road therefore extreme caution is
required.

Equal Opportunities

Trans-Euro supports equal opportunities in education, training and employment, and takes
positive action to achieve this.

We are committed to giving delegates who want to gain an award an equal opportunity of
achieving it irrespective of age, gender, sexual orientation, race, religion, physical abilities,
learning capabilities, eyesight, hearing etc in line with current UK legislation and EU
directives.

Delegates with impairment(s) should make their requirements known in advance of booking
courses in order to provide time for specialised staff external to the Centre to be made
available to assist and for additional exam time to be sought where appropriate, eg for
dyslexic or deaf delegates.

The formal, detailed, Trans-Euro Equal Opportunities Policy statement is available on
request, held by the Course Secretary.

Trans-Euro Staff

The following Trans-Euro staff are involved with running the 2391-10 course:

• Course Tutor
• Course Assessor
• Invigilator
• Course Secretary
• Internal Verifier
• Quality Assurance Coordinator


Complaints and Appeals

Any complaint or appeal should be made in the first instance direct to the Trans-Euro
employee involved. It should be escalated to the assessor or internal verifier/quality
assurance coordinator if satisfaction is not obtained. City & Guilds will not accept complaints
or appeals made directly to them unless this process has been exhausted. The full company
Appeals Policy is available on request from the Centre Secretary.

Disclaimer

Achieving the full C&G 2391-10 qualification does not provide any guarantee of
workmanship, performance, quality or status of the candidate during future endeavours such
as plying his/her trade, applying for membership/enrolment of trade bodies/institutions, or for
job seeking etc

Data Protection

Any personal information Trans-Euro holds will only be used in the context of the business
we conduct with the candidate. This information comprises the candidate’s name, date of
birth, sex, employer and contact details.

The formal, detailed, Trans-Euro Data Protection Policy statement is available on request,
held by the Company Secretary.

Syllabus

The following objectives indicate the level of skills and knowledge required for this
assessment.

The assessments assume the following abilities:

• The application of standard electrical formulae.
• The ability to define all the standard terms in BS 7671.
• The use of a calculator, or other means, to carry out relevant calculations.

1. Practical

1.1 Practical Competence:

1.1.1 Select correct instruments or settings and appropriate scales to carry out tests.

1.1.2 Check and prove instruments and leads for safety and function.

1.1.3 Given the information required, carry out an inspection and test of an installation to
the requirements of the current edition of BS 7671.

1.1.4 Complete a Periodic Inspection report, as given in BS7671, including two Schedules
of Test Results.

1.1.5 Carry out an inspection of installation components and record deviations and
complete a Schedule of Inspections.


2. Underpinning Knowledge

2.1 Preparation for inspection and testing:

2.1.1 State the need for and purpose of initial verification and periodic inspection and
testing.

2.1.2 State the information required to correctly conduct the inspection and testing of an
installation.

2.1.3 State the statutory and non-statutory requirements and guidance material for
particular locations and environments in which electrical installations are installed.

2.1.4 State the need to comply with statutory and non-statutory requirements and guidance
material for particular locations and environments in which electrical installations are
installed.

2.1.5 State the essential and optional information to be contained on Certificates and
Periodic Inspection Reports and how the information is recorded on all certificates as
indicated in Guidance Note 3.

2.2 Inspection

2.2.1 State the human senses that may need to be employed during the inspection of an
installation.

2.2.2 Refer to and select the items to be checked during the inspection process for given
systems and locations as detailed in BS 7671.

2.2.3 State the particular requirements for a periodic inspection of an electrical installation
as defined in BS 7671.

2.2.4 State the need to establish the extent and limitation of a Periodic Inspection Report,
with the client and any relevant third parties, prior to commencing the inspection and the
need to record these details on the Periodic Inspection Report.

2.2.5 State the requirements of the Electricity at Work Regulations for safe inspection and
testing in terms of those:

a. Carrying out the work.

b. Using the installation and the building during the inspection and test.



2.3 Testing

Instruments

2.3.1 State the need for instruments to be regularly checked and the need for their
compliance with the requirements of BS 7671 and HSE document GS 38.

2.3.2 List the correct instruments and appropriate scale to carry out each test and explain
the reasons for each choice.

Sequence

2.3.3 State the recommended sequence of test and the reasons for that sequence.

Protective Conductors

2.3.4 State the requirements which need to be considered for protective conductors in
terms of:

a. Earthing conductors.

b. Main protective bonding conductors.

c. Supplementary protective bonding conductors.

d. Circuit protective conductors.

2.3.5 Describe the need for and methods of verifying the continuity of protective conductors
and the interpretation of results.
2.3.5.1 State the relationship between conductor length, csa and resistance

2.3.5.2 State the effect of temperature on a conductor

Ring Circuits

2.3.6 Describe the need for and methods of verifying the continuity of ring final circuit
conductors and the interpretation of results.

2.3.6.1State the effect on measured resistance when cables are connected in parallel

Insulation Resistance

2.3.7 Explain, by example, the effect on insulation resistance of:

a. Cables connected in parallel.
b. Variation in cable length.

2.3.8 Compare the differences between measurements taken for insulation resistance and
conductor resistance, stating the order of magnitude that would be expected in each case.

2.3.9 State the preconditions required for the performance of insulation testing.

2.3.10 State the precautions to be taken before testing insulation resistance.

2.3.11 Describe the methods of testing insulation resistance.



2.3.12 State the required test voltages and minimum values of insulation resistance for
circuits operating at various voltages.

2.3.13 State the particular requirements for insulation resistance testing of circuits
incorporating surge protection devices (SPDs) or sensitive electronic devices, to include
disconnection and the test voltage to be applied where disconnection cannot be achieved.

Penetration and Flashover

2.3.14 State the requirements for penetration tests and flashover tests on site applied
insulation.

Electrical Separation

2.3.15 Describe the tests to verify the electrical separation of SELV circuits.

2.3.16 State the particular requirements for protection by electrical separation (NOT SELV).

Special Installations and Locations

2.3.17 Describe the requirements for circuits in prescribed special installations and locations
by:

a. Identifying the installations and locations to which special requirements apply.

b. Demonstrating the ability to make reference to the appropriate requirements in
each case.

c. Identifying the requirements in relation to specific areas and installations from
given information.

IP Code

2.3.18 State the appropriate minimum degree of protection required for given applications
within the IP classification BS EN 60529.

Polarity

2.3.19 Describe the need for and methods of testing used to identify correct polarity.

Earth Electrodes

2.3.20 Describe methods of measuring earth electrode impedance and the interpretation of
results.

2.3.21 Differentiate between the requirements for testing of earth electrodes for RCD
protected TT systems and electrodes for transformers and generators.

Earth Fault Loop Impedance

2.3.22 Describe the earth fault loop impedance paths for the following systems:

a. TN-S.

b. TN-C-S.

c. TT.


2.3.23 Describe methods of determining earth fault loop impedance in terms of:

a. The tests used for measuring actual earth fault loop impedance.

b. Methods of calculation of earth fault loop impedance from given data and
measurement of conductor impedance.

2.3.24 Given maximum tabulated values of earth fault loop impedance, verify that
measured values are acceptable, taking into account conductor operating and ambient
temperatures.

Residual Current Devices (RCCBs/RCBOs)

2.3.25 Describe methods of testing the correct operation of residual current devices,
independent of in-built test facilities.

2.3.25.1 State the applications for various RCD ratings.

Prospective Fault Current

2.3.26 Describe methods of determining prospective fault current in terms of:

a. Prospective short circuit current.
b. Prospective earth fault current.

2.3.27 Explain the importance of selecting protective devices appropriate to the prospective
fault current.

Phase Sequence

2.3.28 Describe the requirements for checking phase sequence in terms of

a. The purpose of checking correct phase sequence
b. Test methods used to check phase rotation

Voltage Drop

2.3.29 Describe the methods of verifying voltage drop compliance with BS 7671 in terms of
measuring circuit impedance and calculation.

Assessments

The assessment questions in the evening written exam will seek to examine the objectives
listed under the syllabus topic headings with the percentage weightings shown below:



Syllabus topic No. of Weighting (%)
questions

Section A

2.1 - Preparation for 3 6%
inspection and testing

2.2 - Inspection 2 4%

2.3 - Testing 15 30%

TOTAL, Section A 20 40%

Section B

Whole syllabus 6 60%

TOTAL, Sections A & B 26 100%

Exam booking time
To avoid late entry fees, candidates should book 7 weeks before the exam. City & Guilds
normally arrange an exam in February, March, June, July, August, October and December.

Publication of results

Exam results are normally published within 8 weeks.

Appeals Procedure

A formal appeals procedure is available should a candidate wish to complain, object or
challenge any matter arising from this course or the exam. Anyone wishing to use this
appeals procedure should contact the Trans-Euro Quality Assurance Coordinator.

To obtain independent, informal advice before escalating to C&G HQ, our City & Guilds
External Verifier contact details are:
• Tony Massey
• email: tony.massey@tesco.net
• phone: 01480 890 538

Data Protection
Any personal information Trans-Euro holds will only be used in the context of the business
we conduct with the candidate. This information comprises the candidate’s name, date of
birth, sex, employer and contact details.

The formal, detailed, Trans-Euro Data Protection Policy statement is available on request,
held by the Company Secretary.

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