IEE Wiring Regulations

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IEE Wiring Regulations

• Presentation by
• Geoff CronshawChief Engineer
• Standards and Compliance, IET

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• The IEE Wiring Regulations

1. Overview of the 14th edition compared to the
16th Edition. 2. The current 16th Edition. 3.
The Future 17th Edition
3
Overview of the 14th Edition compared to the 16th
Edition
1

The 14th Edition Issued 1966
The current 16th Edition
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Plan of the 14th Edition
1
Part 1
Part 2
REQUIREMENTS FOR SAFETY MEANS OF SECURING COMPLIANCE WITH PART ONE
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The 14th EditionPart 1 sets out the Requirements
for Safety as follows
1

• Workmanship materials
• Conductors apparatus
• Isolation, switches, fuses circuit-breakers
• Precautions against metal becoming live
• Installation of apparatus special/ wet
  conditions
• Addition to an installation
• Testing

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The 14th Edition Part 2 sets out how this should
be achieved
1

• Section A Control, distribution
  excess-current protection
• Section B Conductors cables
• Section C The installing of apparatus
• Section D Protection against earth-leakage
  currents
• Section E Testing inspection
• Section F Materials, the construction of
  apparatus
• Section G Electric discharge (including
  fluorescent) lighting circuits
• Section H Temporary installations
  installations on construction sites
• Section J Caravan site caravan installations
• Section K Agricultural horticultural
  installations

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The 14th Edition
1

• Tables of current rating and volts drop.
• 8 number appendices
• covering diversity, cables, precautions against
  corrosion, notes on aluminium conduits, P.M.E,
  Earthing tests, and list of British Standards.

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In 1981 the 15th edition was published..

• This marked a significant step towards the
  alignment of UK installation practices with the
  rest of the world!
• Its structure and detailed requirements were
  based closely on IEC publication 364, electrical
  installation of buildings.

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Plan of 16th Edition
1

• part 1 scope, object and fundamental principles
• part 2 definitions
• part 3 assessment of general characteristics
• part 4 protection for safety
• part 5 selection and erection of equipment
• part 6 special installations or locations
• part 7 inspection and testing
• appendices (7)

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Overview of the 14th Edition compared to the 16th
Edition

• In order to see the differences lets look at the
  16th edition..

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2

• The Current 16th Edition

• History
• For over 100 years the IEE have been at the
  centre of producing Standards to promote
  electrical safety in industry and to the public
• The IEE issued their first wiring rules in 1882
• 4 pages and 21 Regulations 321 pages
  and 870 Regulations

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2

• In 1992 the IEE Wiring Regulations became a
  British Standard (BS 7671) - now treated like all
  other British Standards.
• The IEE publish the Wiring Regulations (BS 7671)
  in agreement with BSI.
• They are based on CENELEC harmonisation documents
  (European Standards) which in turn are usually
  based on IEC standards (World Standards)

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2

• CENELEC, the European Commitee for
  Electrotechnical Standardisation, was created in
  1973.
• non-profit technical organisation - Belgian law -
  composed of the National Committees of 22
  European countries.
• CENELECs mission is to prepare voluntary
  electrotechnical standards that help develop the
  Single European Market/European Economic Area for
  electrical and electronic goods and services

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IEC
2

• The International Electrotechnical Committee
  (IEC) is the oldest of the international
  standardisation organisations.
• founded back in 1906
• The IEC is an international non-governmental
  organisation whose members are the national
  electrotechnical committees (like the British
  Electrotechnical Committee in the UK).
• 48 full members,
• Provides globally recognised standards
• IEC members are not required to adopt the
  standards issued by this body at national level.

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2

• The Regulations are the UK National Standard up
  to 1000V ac or 1500V dc
• The IEE Wiring Regulations are non-statutory.
  Referred to in HSE guidance over the years and
  are referred to in the ESQCR for the electricity
  supply industry.
• The Regulations do not apply to certain
  installations, for example distributors
  equipment as defined in the ESQCR.

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2
In certain cases the Regulations may need to be
supplemented by the requirements or
recommendations of other British Standards, for
example fire detection and alarm systems in
buildings BS 5839
17
2

• Plan and style
• The Regulations are divided into 7 parts with 7
  Appendices
• For examplePART CHAPTER SECTION
  SUB-SECTION REGULATION
• 4 1 3 - 02 -
  06
• The regulations apply to the design, selection,
  erection, and inspection and testing of
  electrical installations

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2

• PART 1 GIVES THE SCOPE, OBJECT AND FUNDAMENTAL
  PRINCIPLES
• PART 2 GIVES THE DEFINITIONS
• PART 3 SETS OUT THE ASSESSMENT OF GENERAL
  CHARACTERISTICS

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Part 4 Protection for SafetyChapter 41
protection against electric shockSection 412
has requirements for Protection Against Direct
Contact
2

• persons and livestock shall be protected against
  dangers arising from direct contact by either
• (i) preventing contact with live parts, or
• (ii) limiting the current in the event of
  direct contact.
• Four basic protective measures are prescribed and
  are summarised in Table 2.2.

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2
Section 412
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Part 4 Protection for SafetyChapter 41
protection against electric shockSection 413
has requirements for Protection Against Indirect
Contact
2
BS 7671 prescribes five basic protective
measures, summarised in Table 3.2.
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Part 4 Protection for SafetyChapter 41
protection against electric shockSection 413
has requirements for Protection Against Indirect
Contact
2
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2
Part 4 Protection for SafetyChapter 41
protection against electric shockSection 413
has requirements for Protection Against Indirect
Contact

• Earthed equipotential bonding and automatic
  disconnection of the supply is the most widely
  used measure
• The measure consists of three separately
  identifiable components
• (i) earthing of installation equipment
  metalwork (exposed-conductive-parts)
• (ii) equipotential bonding, as required, of
  non-electrical metalwork
• (extraneous-conductive-parts)
• (iii) automatic disconnection of supply.

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Part 4 Protection for SafetyChapter 41
protection against electric shockSection 413
has requirements for Protection Against Indirect
Contact
2

• effective earthing of each exposed-conductive-part
  of the installation is required
• (i) to ensure operation of the protective device
  in the event of a fault
• (ii) to limit the rise in potential above earth
  potential of exposed- conductive-parts during a
  fault.
• The connection with earth referred to above forms
  part of the earth fault loop and, within the
  installation,

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Equipotential Bonding
2
Part 4 Protection for Safety Chapter 41
protection against electric shock Section 413
has requirements for Protection Against Indirect
Contact

• In addition to the earthing of exposed-conductive-
  parts, bonding of these same exposed-conductive-pa
  rts and extraneous-conductive-parts is vital in
  order to minimise any potential differences that
  might exist between the parts during an earth
  fault.
• Thus, the purpose of the various types of
  protective bonding referred to in BS 7671 is to
  equalise potential rather than to carry fault
  current, although sometimes bonding conductors
  will also carry fault current where they form
  part of a parallel earth return path to the
  source of supply, e.g. the transformer.
• Regulation 413-02-02 requires main equipotential
  bonding to be carried out in every installation
  where earthing is employed, yet its importance is
  often underestimated.

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Part 4 Protection for SafetyChapter 41
protection against electric shock
The effect of connecting main bonding conductor
to the extraneous conductive part is to minimise
Uf.
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Part 4 Protection for Safety

• Chapter 42 - Protection against thermal effects
• Chapter 43 - Protection against overcurrent
• Chapter 44 - Protection against overvoltage
• Chapter 45 - Protection against undervoltage

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Part 4 Protection for SafetyChapter 46
isolation and switching

• isolation
• switching off for mechanical maintenance
• emergency switching
• functional switching (control)

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isolation

• 460-01-02 A main linked switch or linked
  circuit-breaker shall be provided as near as
  practicable to the origin of every installation
  as a means of switching the supply on load and as
  a means of isolation.

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switching off for mechanical maintenance

• 462-01-01 A means shall be provided where there
  is a risk of burns or injury from mechanical
  movement.

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emergency switching

• A means of emergency switching shall be provided
  for every part of an installation which it may be
  necessary to cut off rapidly from the supply in
  order to prevent or remove danger.

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functional switching (control)

• A functional switching device shall be provided
  for each part of a circuit which may require to
  be controlled independently of other parts of the
  installation.

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Part 4 Protection for Safety

• Chapter 47 - application of protective measures
  for safety
• Chapter 48 - choice of protective measures as a
  function of external influences

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Part 5 selection and erection of
equipmentchapter 51 common rulesSection 514
identification and notices

• Work commencing on site after 31 March 2006 is
  required to comply with the harmonised cable
  colours and must not use the old colours.

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(No Transcript)
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Part 5 selection and erection of
equipmentchapter 51 common rulesSection 514
identification and notices
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Part 5 selection and erection of
equipmentchapter 51 common rulesSection 514
identification and notices
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Part 5 selection and erection of
equipmentchapter 52 selection and erection of
wiring systemsSection 522 external
influencesRegulation 522-06-06
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Part 5 selection and erection of
equipmentchapter 52 selection and erection of
wiring systemsSection 522 external
influencesRegulation 522-06-05
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Part 5 selection and erection of
equipmentchapter 52 selection and erection of
wiring systemsSection 527 spread of fire
Regulation 527-02-02
Fire barrier
Fixed lidthrough floor
Floorthickness
Copper earthingstrap betweenlengths
Detachablecover
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Part 5 selection and erection of
equipmentchapter 53 switchgear(For protection,
isolation and switching)
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Part 5 selection and erection of
equipmentchapter 54 earthing arrangements and
protective conductors
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Part 5 selection and erection of
equipmentchapter 54 earthing arrangements and
protective conductors
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Part 5 selection and erection of
equipmentchapter 54 earthing arrangements and
protective conductors
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Part 5 selection and erection of
equipmentchapter 55 other equipment includes
generators.
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Part 5 selection and erection of
equipmentchapter 56 supplies for safety
services.