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IET Guidance Note 1 Selection and Erection 5th Edition 2019 (PDF)

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About the book

5th edition 2019 (incorporating BS 7671:2018)
Pages: 230
Publisher: IET
Language: English;
Size: 145 Mb;

This Guidance Note is part of a series issued by the Institution of Engineering and Technology to explain and enlarge upon the requirements in BS 7671:2018, the 18th Edition of the lET Wiring Regulations.
This Guidance Note is principally concerned with Part 5 of BS 7671- Selection and erection of equipment.


Cooperating organizations
Chapter I General requirements
The Electricity at Work Regulations 1989
The Construction (Design and Management) Regulations 2015
Building Regulations
1.5.1 The Building Regulations 2010 (England and Wales)
1.5.2 The Building (Scotland) Regulations 2004
Chapter 2 Selection and erection of equipment
Compliance with standards
2.2.1 European norms (ENs)
2.2.2 Harmonization documents (HDs)
Operational conditions and external influences
2.3.1 Motors
2.3.2 Electromagnetic compatibility (EMC)
2.3.3 Harmonics
Identification and notices
2.4.1 Cables and conductors
2.4.2 Circuits
2.4.3 Switchgear
2.4.4 Warning notices
2.4.5 Other notices
2.4.6 Safety signs
2.4.7 Notices and identification labels
Mutual detrimental influence
Functional earthing
Low voltage (LV) switchgear and controlgear assemblies
2.8.1 Forms of separation
2.8.2 Ceneral
Chapter 3 Protection against overcurrent, electric shock and overvoltage
Protection against electric shock - overview
3.1.1 Automatic disconnection of supply
3.1 .2 Basic protection
3.1.3 Fault protection
3.1.4 Additional protection
Protective devices
Overcurrent protective devices
3.3.1 Motor circuits
3.5.1 Circuit-breakers for applications not exceeding 440 v AC
3.5.2 Circuit-breakers for applications not exceeding 1000 V AC (MCCBS)
3.5.3 Circuit-breakers - general insulation monitoring devices (IMDs) Residual current devices (RCDs)
3.7.1 Terminology
3.7.2 A wide choice of devices
3.7.3 Selectivity (discrimination)
3.7.4 Additional protection
3.7.5 Location of RCDs
3.7.6 Selection of types of RCD
3.7.7 TT systems
3.7.8 Two distinct categories
3.7.9 Limitations and precautions
3.7.10 Unwanted tripping
Automatic disconnection of supply
3.8.1 Types of protective conductor
3.8.2 Protective bonding
3.8.3 Sizing of earthing conductor and main protective bonding
3.8.4 Earthing of flush metal accessory boxes
Protection against voltage disturbances
3.9.1 Disturbances due to earth faults in the high voltage system and due to faults in the low voltage system
Protection against overvoltages of atmospheric origin or due to switching
Equipment rated impulse voltages
Overvoltage control
Switching overvoltages
Surge protective devices (SPDs)
Protection against arcing
Chapter 4 External influences
Ambient temperature (AA)
Solar radiation (AN) and ultraviolet radiation
The IP and IK codes
Presence of water (AD) or high humidity (AB)
Presence of solid foreign bodies (AE)
Presence of corrosive or polluting substances (AF) impact (AG), vibration (AH) and other mechanical stresses (AJ)
Presence of fauna (AL), flora and/or mould growth (AK)
Potentially explosive atmospheres
Precautions where particular risks of fire exist
4.11.1 Locations with risks of fire due to the nature of processed or stored materials
Locations constructed of combustible materials
Fire propagating structures
Locations of national, commercial, industrial or public significance
Chapter 5 Installation of cables
Cable selection
5.1.1 Conduit, trunking and ducting systems standards
Cables concealed in structures
5.2.1 Walls and partitions
Cable routes and livestock
Capacities of conduit and trunking
Selection of cables and wiring systems with low emission of smoke
and corrosive gases when affected by fire 'Section 20'
Buried cables
Sealing and fire stopping
Chapter 6 Sizing of cables
Current-carrying capacity and voltage drop
Neutral conductors
Voltage drop in consumers' installations
Chapter 7 Other influences
Electrical connections
Cables in contact with thermal insulation
7.2.1 Typical cable sizes
Mutual or individual deterioration
Proximity of wiring systems to other services
Plasticiser migration from PVC insulation
Section 444 Measures against electromagnetic disturbances
7.6.1 Introduction to electromagnetic compatibility (EMC)
7.6.2 EMC legislation
7.6.3 Scope of BS 7671 Section 444
7.6.4 Section 444 and general EMC advice
7.6.5 Recommended further reading
Auxiliary circuits
7.7.1 Introduction
7.7.2 Content of Section 557
7.7.3 Power supplies and configuration
7.7.4 Current transformers and voltage transformers
7.7.5 Connection to the main circuit
Chapter 8 Installation of equipment
Earthing requirements for the installation of equipment having high protective conductor currents
8.1.1 Scope
8.1.2 The risks
8.1.3 Equipment
3.1.4 Labellings
8.1.5 Ring circuits
8.1.6 Radial circuits
8.1.7 Busbar systems
8.1.8 RCDs and high protective conductor currents
Water heating
Safety services
Other equipment
8.5.1 Scope
8.5.2 General
8.5.3 Protection against fire
8.5.4 Transformers, convertors and controlgear
8.5.5 Independent lamp controlgear
8.5.6 Stroboscopic effect
Highway power supplies, street furniture and external lighting installations
8.6.1 Protection against electric shock
8.6.2 Equipment doors
8.6.3 Devices for isolation and switching
8.6.4 Protection and identification of cables
8.6.5 External influences
8.6.6 8us shelters, etc. and decorative lighting
8.6.7 References
Extra-low voltage lighting installations
8.7.1 Protection against overcurrent
8.7.2 Isolation and switching
8.7.3 Protection against fire
8.7.4 Nature of processed or stored materials
8.7.5 Fire risk of transformers and convertors
8.7.6 Fire risk from short-circuiting of uninsulated conductors
8.7.7 Bare conductors
8.7.8 Suspended systems
8.7.9 Cross-sectional area of conductors
8.8 Selection and erection in relation to operation and maintainability
8.9 Low voltage assemblies according to 85 EN 61439 series
Appendix A Cable capacities of conduit and trunking
A1 General
A2 Single-core thermoplastic (PVC) insulated cables in straight runs of conduit not exceeding 3 m in length
A3 Single-core thermoplastic (PVC) insulated cables in straight runs of conduit exceeding 3 m in length, or in runs of any length incorporating bends or sets
A4 Single-core thermoplastic (PVC) insulated cables in trunking
A5 Other sizes and types of cable in conduit or trunking, including flexible conduit
A6 Background to the tables
Appendix B Degrees of protection provided by enclosures
IP code for ingress protection
B1.1 General
Bl.2 Additional letter
Bl.3 Supplementary letter
B1.4 Product marking
B1.5 Drip-proof and splashproof
IK code for impact protection
B2.1 General
Appendix C Standard circuit arrangements and the provision of socket-outlets
Final circuits using socket-outlets and fused connection units complying with BS 1363
C2.1 Layout
C2.2 Circuit protection
C2.3 Conductor size
C2.4 Spurs
C25 Permanently connected equipment
Radial final circuits using 16 A socket-outlets complying with BS EN 60309-2 (is 4343)
C3.1 General
C3.2 Circuit protection
C3.3 Conductor size
C3.4 Types of socket-outlet
Cooker final circuits in household premises
Water heating and electric shower final circuits in household premises
Provision of socket-outlets
C6.1 Number of socket-outlets
C6.2 Sinks and electrical accessories
C7 Mounting heights of accessories
C7.l BS 8300-1 :2018 and BS 8300-2:2018 Design of an accessible and inclusive built environment - Codes of practice
Appendix D Limitation of earth fault loop impedance for compliance with Regulation 543.1.1
DO Selection of a circuit protective conductor
D2 Steel conduit and trunking
DO Steel-wire armored cables
DO Mineral insulated cable with copper sheath
D5 Thermoplastic (PVC) insulated and sheathed cables to BS 6004
Appendix E Resistance and impedance of copper and aluminum conductors under fault conditions
E1 Verification
E2 Mineral insulated cable with copper sheath
E3 Steel-wire Armour, steel conduit and steel trunking
Appendix F Selection and erection of wiring systems
F1 General
F2 British Standards
FE Fire stopping
Appendix G Notes on methods of support for cables, conductors and wiring systems
G1 Cables generally
G2 Particular applications
G3 Overhead wiring
G4 Conduit and cable trunking
G5 Conduit bends
G6 Spacing of supports for busbar trunking systems
Appendix H Maximum demand and diversity
Appendix I Permitted protective conductor currents
Appendix J Standard symbols, units and graphical symbols for general electrical purposes
J1 General symbols
J1.1 Sl derived units
J2 Symbols tor use in schematic wiring diagrams
J2.1 Making and breaking current
J2.2 Isolating
J2.3 Making, breaking and isolating
J2.4 Meters
J3 Location symbols for installations
Appendix K Addresses of associated bodies and industry contacts

Tags: Guidance Note 1, Guidance Note 1 Selection and Erection, Selection and Erection 5th edition

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