Guidance Note 7 Special Locations BS 7671:2018+A2:2022, 7th Edition 2022 (PDF)

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About the book:

Publisher: IET
Place of Publication: United Kingdom
Pages: 208
Edition: 2022
Language: English
Size: 89 Mb

Updated to BS7671:2018+A2:2022 IET Wiring Regulations (Amendment 2 to BS 7671:2018 (18th Edition of the IET Wiring Regulations), which introduces a new requirement for Arc Fault Detection Devices (AFDDs), updated requirements for the fire safety design for buildings and a new chapter on Prosumer’s Low Voltage Electrical Installations).

Amendment 2 comes into effect immediately when published on 28th March 2022 and the previous version, BS 7671:2018+A1:2020, will be withdrawn six months later.

Content:

Cooperating organizations
Acknowledgements
Preface
Introduction
Chapter 1 Locations containing a bath or shower
1.1 Introduction
1.2 Scope
1.3 The risks
1.3.1 Clothing
1.3.2 Body impedance
1.3.3 Immersion
1.4 Zones
1.5 Protection against electric shock
1.5.1 Locations containing a bath or shower
1.5.2 Supplementary protective equipotential bonding
1.5.3 Supplementary protective equipotential bonding of plastic pipe installations
1.6 Switchgear and controlgear
1.6.1 Telephones
1.7 Current-using equipment
1.8 Other equipment, e.g. home laundry equipment
1.9 Electric floor heating systems
Chapter 2 Swimming pools and other basins
2.1 Introduction
2.2 Scope
2.3 The risks
2.4 Zones
2.4.1 Zone 0
2.4.2 Zone 1
2.4.3 Zone 2
2.5 Protection for safety
2.6 Luminaires
2.6.1 Luminaires for swimming pools
2.6.2 Underwater luminaires for swimming pools
2.7 Socket-outlets
2.8 Current-using equipment of swimming pools
2.8.1 Special requirements for the installation of electrical equipment in zone 1 of swimming pools and other basins 3 4
2.9 Fire alarms and public address systems
2.10 Fountains
2.10.1 General
2.10.2 Electrical equipment of fountains
2.10.3 Additional requirements for the wiring of fountains
Chapter 3 Rooms and cabins containing sauna heaters
3.1 Introduction
3.2 Scope
3.3 The risks
3.3.1 Zones
3.4 Shock protection
3.5 Wiring system
3.6 Heating elements
Chapter 4 Construction and demolition site installations
4.1 Introduction
4.2 Scope
4.3 The risks
4.4 Supplies
4.5 Protection against electric shock
4.5.1 Supplies to socket-outlets and hand-held equipment
4.6 Reduced low voltage
4.6.1 Maximum earth fault loop impedances
4.7 External influences
4.8 Wiring systems
4.9 Other mechanical stresses (AJ)
4.10 Isolation and switching
4.11 Protection against the weather and dust
4.12 Inspection and testing
Chapter 5 Agricultural and horticultural premises
5.1 Introduction
5.2 Scope
5.2.1 Residences and other locations belonging to agricultural and horticultural premises
5.3 The risks
5.4 Electricity supplies
5.5 Protection against electric shock
5.5.1 Protective measure: automatic disconnection of supply
5.6 Earth fault loop impedances
5.7 Precautions where particular risks of fire exist
5.8 External influences
5.9 Wiring systems
5.10 Safety services
Chapter 6 Conducting locations with restricted movement
6.1 Introduction
6.2 Scope
6.3 The risks
6.4 Protection against electric shock
6.5 Additional protection
4 Guidance Note 7: Special Locations
Chapter 7 Electrical installations in caravan/camping parks, caravans and motor caravans
7.1 Introduction
7.2 Scope of Sections 708 and 721
7.2.1 Section 708
7.2.2 Section 721
7.3 The risks
7.4 Legislation and standards
7.5 Electrical installations in caravan parks (708)
7.5.1 Supply systems
7.5.2 Overhead and underground distribution
7.5.3 External influences
7.5.4 Caravan pitches
7.5.5 Socket-outlets, overcurrent and RCD protection, and isolation
7.5.6 Separation of electrodes
7.6 Caravans and motor caravans (721)
7.6.1 Protective equipotential bonding
7.6.2 Provision of RCDs
7.6.3 Protective equipotential bonding
7.6.4 Protection against overcurrent
7.6.5 Selection and erection of equipment
7.6.6 Proximity to non-electrical services
7.6.7 Switchgear and controlgear
7.6.8 The connecting flexible cable
7.7 Tents
Chapter 8 Marinas and similar locations
8.1 Introduction
8.2 Scope
8.3 The risks
8.4 General requirements
8.5 Supplies
8.6 Protection against electric shock
8.7 Operational conditions and environmental factors
8.8 Wiring systems
8.9 Distribution boards, feeder pillars and socket-outlets
8.10 General notes
8.10.1 Pontoon amenity lighting
8.10.2 Navigation lighting
8.10.3 Fuelling stations
8.10.4 Metering systems
8.10.5 Location of equipment
8.10.6 Routine maintenance and testing
Chapter 9 Medical locations
9.1 Introduction
9.2 Scope
9.3 The risks
9.3.1 Electric shock
9.3.2 Medical electrical equipment
9.3.3 Security of supply
9.4 Definitions
9.4.1 Medical location
9.4.2 Patient
9.4.3 Medical electrical (ME) equipment 83
9.4.4 Applied part
9.4.5 Group 0
9.4.6 Group 1
9.4.7 Group 2
9.4.8 Medical electrical (ME) system
9.4.9 Patient environment
9.4.10 Medical IT system
9.5 Assessment of general characteristics
9.6 Purposes, supplies and structure
9.6.1 Types of system earthing
9.7 Supplies
9.7.1 General
9.8 Protection against electric shock
9.8.1 Basic protective provisions
9.9 Requirements for fault protection (protection against indirect contact)
9.9.1 Automatic disconnection in case of a fault
9.9.2 TN systems
9.9.3 TT systems
9.9.4 Medical IT systems
9.9.5 Functional extra-low voltage (FELV)
9.10 Protection by SELVand PELV
9.11 Supplementary protective equipotential bonding (additional protection)
9.12 Resistance of protective conductors in Group 1 and Group 2 medical locations
9.12.1 Specification of the equipotential bonding busbar (EBB)
9.13 Arc fault detection devices (AFDDs)
9.14 Measures against electromagnetic disturbances
9.15 Operational conditions
9.15.1 Transformers for medical IT systems
9.15.2 Power supply for medical locations of Group 2
9.15.3 Distribution boards
9.15.4 Explosion risk
9.15.5 Diagrams and documentation
9.16 Selection and erection of wiring systems in Group 2 medical locations
9.17 Overcurrent protective devices: protection of wiring systems in Group 2 medical locations
9.18 Isolation and switching: general
9.19 Socket-outlet circuits in the medical IT system for Group 2 medical locations
9.20 Luminaires and lighting installations
9.21 Safety services
9.21.1 Classification of safety services for medical locations
9.21.2 General requirements for safety power supply sources of Group 1 and Group 2 medical locations
9.21.3 Failure of the general power supply source
9.21.4 Socket-outlets
9.21.5 Detailed requirements for safety power supply services
9.21.6 Power supply sources with a changeover period less than or equal to 0.5 s
9.21.7 Power supply sources with a changeover period less than or equal to 15 s
9.21.8 Power supply sources with a changeover period greaterthan 15 s
9.21.9 Circuits of safety services
9.21.10 Safety lighting
9.21.11 Other services
9.22 Inspection and testing
9.22.1 Initial verification: general
9.22.2 Periodic inspection and testing: general
9.23 Further guidance
9.23.1 The Department of Health and Social Care
9.23.2 IET publications
Chapter 10 Solar photovoltaic (PV) power supply systems
10.1 Introduction
10.2 Scope
10.3 The Electricity Safety, Quality and Continuity Regulations 2002
10.4 Normative references
10.5 Definitions
10.6 Protection for safety
10.6.1 Protection against electric shock
10.7 Wiring systems
10.8 Isolation and switching
10.9 Disconnection of the functional bonding conductor
10.10 Measures to prevent DC on-load interruption
10.11 Earthing arrangements and protective conductors
10.12 Verification
Chapter 11 Exhibitions, shows and stands
11.1 Introduction
11.2 Scope
11.3 The risks
11.4 Protection against electric shock
11.4.1 Protection by automatic disconnection of supply
11.4.2 Bonding of stands, vehicles, wagons, caravansand containers
11.4.3 Protection by SELV or PELV
11.5 Protection against thermal effects
11.5.1 Protection against fire
11.5.2 Lighting
11.6 Protection, isolation, switching, control and monitoring
11.7 Measures of protection against overcurrent
11.8 Selection and erection of equipment
11.8.1 Wiring systems
11.8.2 Electrical connections
11.8.3 Extra-low voltage (ELV) transformers and electronic convertors
11.8.4 Socket-outlets
11.9 Generators
11.10 Safety services
11.11 Inspection and testing
Chapter 12 Heating cables and embedded heating systems
12.1 Introduction
12.2 Scope
12.3 The risks
12.4 Protection against electric shock
12.5 Protection against thermal effects
12.5.1 Protection against burns (maximum surface temperature of floor)
12.5.2 Protection against overheating
12.6 Standards
12.7 Identification
12.8 Heating-free areas
12.9 Heating conductors and cables
12.10 Locations containing a bath or shower
12.11 Swimming pools and other basins
12.12 Information for the user of the installation
Chapter 13 Gardens (other than horticultural installations)
13.1 Introduction
13.2 The risks
13.3 Cables
13.3.1 Buried cables
13.3.2 Cables exposed to sunlight
13.3.3 Cables taken overhead
13.4 Socket-outlets
13.5 Fixed equipment
13.6 Ponds
13.7 Supplies to outbuildings within the garden
13.7.1 Additions and alterations to an existing installation
13.7.2 Earthing and main protective equipotential bonding
13.7.3 TT system
13.7.4 RCD protection
13.7.5 Inspection, testing and certification
13.8 Supplies to hot tubs
Chapter 14 Mobile or transportable units
14.1 Introduction
14.2 Scope
14.3 The risks
14.4 Supplies
14.4.1 General
14.4.2 TN system
14.4.3 IT system
14.4.4 Supply intake transformers
14.4.5 Units with a second supply
14.5 Protection against electric shock 146
14.5.1 General
14.5.2 Protective measure: electrical separation
14.5.3 Additional protection
14.6 Protective equipotential bonding
14.7 Wiring systems external to the mobile or transportable unit
14.8 Wiring systems inside the mobile or transportable unit
14.9 Proximity to non-electrical services
14.10 Identification and notices
14.11 Other equipment
14.12 Inspection, testing and certification
14.13 Routine maintenance and testing
Chapter 15 Small-scale embedded generators (SSEGs)
15.1 Introduction and the law
15.1.1 The Electricity Safety, Quality and Continuity Regulations 2002
15.1.2 BS 7671 Section 551 - Low voltage generating sets
15.2 Engineering Recommendations
15.3 Installation and wiring
15.4 Means of isolation
15.5 Earthing
15.6 Labelling
Chapter 16 Temporary electrical installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses
16.1 Introduction
16.2 Scope
16.3 Electrical supplies
16.4 Protection against electric shock
16.5 Additional protection
16.6 Installation
16.6.1 Wiring systems
16.6.2 Cables
16.6.3 Electrical connections
16.6.4 External influences
16.6.5 Switchgear and controlgear
16.6.6 Isolation, switching and overcurrent protection
16.6.7 Luminaires
16.6.8 Safety isolating transformers and electronic convertors
16.6.9 Plugs and socket-outlets
16.7 Fire risk
16.7.1 Luminaires and floodlights
16.7.2 Electric motors
16.8 Electrical equipment
16.8.1 Electrical supply to devices
16.8.2 Electric dodgems
16.8.3 Low voltage generating sets
16.9 Inspection and testing
16.9.1 The temporary installation
16.9.2 Amusement devices
Chapter 17 Operating and maintenance gangways
17.1 Introduction
17.2 Scope
17.3 Accessibility
17.3.1 Requirements for operating and maintenance gangways
17.3.2 Restricted access areas where basic protection is provided by barriers or enclosures
17.3.3 Restricted access areas where the protective measure of obstacles is applied
17.3.4 Access to gangways
Chapter 18 Outdoor lighting installations
18.1 Introduction
18.2 Scope
18.3 Protection against electric shock
18.4 Operational conditions and external influences
18.5 Isolation and switching
18.6 Additional protection
18.7 Protection and identification of cables
18.8 References
Chapter 19 Extra-low voltage lighting installations
19.1 Introduction
19.2 Scope
19.3 Protection against electric shock
19.4 Protection against thermal effects - fire risk of transformers/converters
19.5 Protection against overcurrent
19.6 Types of wiring system
19.7 Bare conductors
19.8 Suspended systems
19.9 Cross-sectional area of conductors
19.10 Voltage drop in consumers' installations
19.11 Protective devices and SELVsources
19.12 Isolation and switching
Chapter 20 Electric vehicle charging installations
20.1 Introduction
20.2 Scope
20.3 Protection against electric shock
20.4 Protective multiple earthing (PME)
20.5 Operational conditions and external influences
20.6 Isolation and switching: emergency switching off
20.7 Devices for fault protection by automatic disconnection of supply
20.8 Other equipment: socket-outlets and vehicle connectors
20.9 Annex A to Section 722
20.9.1 Earth electrodes
20.9.2 Earthing conductors
Chapter 21 Onshore units of electrical shore connections for inland navigation vessels
21.1 Introduction
21.2 Supplies
21.3 Galvanic separation
21.4 Protection against electric shock
21.5 Operational conditions and external influences
21.6 Types of wiring system
21.7 Residual current device (ROD) protection
21.8 Overcurrent protection
21.9 Isolation
21.10 Requirements for socket-outlets
Index

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