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NICEIC Site Guide For Electrical Installations up to 100 A | 18th Edition 2018 (PDF)

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Place of Publication: United Kingdom;
Pages: 315
Size: 146 Mb
Publisher: NICEIC / ELECSA / ECA
Language: English
First Published: 2018
Reprinted: September 2018

This Guide is intended for contractors who carry out electrical installation work in dwellings, including houses and flats. lt provides information and guidance relating to the design, construction, inspection, testing and certification of domestic electrical installation work, and is intended to promote good practice and aid understanding of the fundamental concepts of protection for safety. The guidance is based on the requirements of BS 7671: 2018 Requirements for Electrical installations, and references to Regulation numbers are to those contained in that Standard.


CHAPTER 1: Introduction
Statutory and non~statutory requirements
Health and Safety at Work etc Act 1974
Electricity at Work Regulations 1989
Construction (Design and Management) Regulations 2015
Provision and Use of Work Equipment Regulations 1998
Electricity Safety, Quality and Continuity Regulations
The Building Regulations England and Wales. The Building Regulations 2010 Scotland. Building (Scotland) Regulations 2004 (as amended)
BS 7671
Health and Safety Executive HSR25 - Memorandum of guidance on the Electricity at Work Regulations 1989 - Guidance on Regulations
GS38 - Electrical test equipment for use by electricians
Other guidance
Electrical Safety First
Best Practice Guides
CHAPTER 2: Supply systems and earthing and bonding
The service position
System types and earthing arrangements
Supply system earthing
Installation earthing
Means of earthing
Responsibility for providing, assessing, and verifying the means of earthing
Main protective bonding
Supplementary bonding
Sizing of circuit protective conductors
Earthing arrangements where an installation contains equipment having
high protective conductor currents
CHAPTER 3: Protective devices
Introduction to protective devices
Cartridge fuses
BS 88
BS 1.861
BS 1362
Semi-enclosed fuses to 85 3036
BS EN 60898
BS 3871
Residual current devices
RCCBs to BS EN 61008 and BS 4293
RCBOs to 85 EN 61009
Classification of RCDs (RCD type)
RCD protected socket-outlets
Typical applications for RCDs in domestic premises
Arc fault detection device (AFDDs)
Testing AFDDs
Overvoltage protection and surge protective devices
Risk assessment method
CHAPTER 4: Protection against electric shock
Provisions for basic protection
Protective measure: Automatic disconnection of supply (ADS)
Protective earthing
Protective equipotential bonding
Automatic disconnection in case of a fault
Additional protection by RCD
Protective measure: Double or reinforced insulation
Protective measure: Electrical separation
Protective measure: Extra-low voltage provided by SELV or PELV
Requirements for basic protection and fault protection
Sources for SELV and PELV
Additional requirements for SELV circuits
Additional protection
Supplementary equipotential bonding
CHAPTER 5: Consumer unit and distribution board arrangements
Split-load arrangements
Advantages and disadvantages of a unit
Series connected RCDs
Selectivity between RCDs in series
Selectivity between an upstream overcurrent protective device and an RCD
Selectivity between an RCD and a downstream overcurrent protective device
Installations forming part of a Tl' system
Protective conductor currents
Consumer unit location
Separation of electrical cables and accessories from the gas installation pipework
Mounting height
Dwellings liable to flooding
CHAPTER 6: Isolation and switching
Introduction and terminology
Installations supplied from more than one source
Remote isolation
Isolating devices
Switching of"f for mechanical maintenance
Emergency switching
Functional switching
CHAPTER 7: Identification and labeling
Introduction and general requirements
Identification of conductors
Single-phase installations
Identification of switch-wires
Extensions, alterations or repairs to an existing single-phase installation
Identification of conductors - warning notice at the consumer unit or distribution board
Three-phase installations
Summary of conductor identification
Protective Devices
Charts, diagrams, tables and circuit information
Periodic inspection and testing
RCD test button
Earthing and bonding connections
Alternative supplies
Circuits having a high protective condudOrCurrent
Presence of solar photovoltaic (PV) systems
CHAPTER 7: Distribution circuits
Load center and supplies to other buildings
Assessment of current demand
Voltage drop
Disconnection times
Recording of circuit details
CHAPTER 8: Final circuits
Circuits supplying socket-outlets
Radial final circuit
Ring final circuit
Permanently connected loads
Introduction to lighting circuits
Ceiling roses
Luminary supporting couplers
Extra-low voltage lighting installations
Voltage drop
CHAPTER 10: Factors relating to installation of wiring systems and cables
Wiring systems - types
Applications of cables for fixed wiring
Installation methods
Wiring in lofts
External influences
Ambient temperature
External heat sources
Water and high humidity
Solid and foreign bodies
Corrosive and polluting substances
Meeting the requirements of Regulation 522.6.204
Protection of concealed cables in floors and ceilings
Protection of cables in walls
Walls with an internal construction NOT containing significant metallic parts
Walls with an internal construction containing significant metallic parts
Protection of cables embedded in plastered walls
Other mechanical stresses
Damage caused during installation
Means of access to withdrawable wiring systems
Bending radii
Flexible wiring systems
Presence of fauna, flora and/or mould growth
Solar and ultraviolet radiation
Solar gain
Impact upon the building structure
Penetration of elements of building construction by wiring systems
Chases in walls
Fundamental requirements
Selection of means of connection and termination
The material of the conductor and its insulation
The number and shape of the wires forming the conductor
The cross-sectional area of the conductor
The number of conductors to be connected together
The temperature attained by the terminals in normal service
Soldered connections
Provision of adequate locking arrangements
External influences
Enclosure of connections
Protection against electric shock
Basic protection
Fault protection
Accessibility of connections
Protective conductor connections involving the metal sheath or armoring or metal enclosure
Cable supports
Surfaces in contact with a cable
Suitability for external influences
Avoidance of electrolytic corrosion
Enclosure of non-sheathed cables
Vertical runs of trunking or ducting exceeding 5 m in length
Vertical runs of conduit exceeding 5 m in length
Vertical runs of cable-supported from the top
Cables resting without fixings
Spacing between supports
Wiring System supports
CHAPTER 11: Special installations and locations
Introduction and scope »
Locations containing a bath or shower
Protection against electric shock
Additional protection
Supplementary equipotential bonding
External influences
Switchgear, controlgear and accessories
Fixed current-using equipment
Low voltage socket-outlets
Shaver supply units and SELV socket-outlets
Stationary equipment
Electric floor heating systems
Swimming pools
Protection against electric shock
Zones 0 and 1 of a swimming pool
Zone 2 of a swimming pool
Supplementary equipotential bonding
External influences
Degrees of protection of enclosures against water ingress
Wiring systems
Switchgear and controlgear
Current-using equipment of swimming pools
Underwater Luminaries for swimming pools 212
Special requirements relating to the installation of electrical equipment in zone 1 of swimming pools
Protective Multiple Earthing (PME)
Temperature zones
Protection against electric shock
Additional protection by RCDs
Selection and erection of equipment
Wiring systems
Isolation, switching, control and accessories
Lighting installations
Electric vehicle charging installations
Electric vehicle charging equipment suitable for use in domestic premises
The supply to electric vehicle charging equipment in domestic premises
Circuit design and loading allowances
Protective measures against electric shock
Where Protective Multiple Earthing (PME) is used
RCD protection of charging points
Protection by electrical separation
Protection against external influences
Miscellaneous requirements
CHAPTER 12: Electrical equipment outside the dwelling increased risk of electric shock
Additional protection by means of an RCD
Electrical equipment
Buried cables
Surface-installed cables
Armored cable terminations
Equipment for use in ponds
CHAPTER 13: Additional sources of supply
BS 7671 requirements for generators to operate in parallel
Energy Networks Association G83 / 2
Solar photovoltaic (PV) systems
The DC side
Isolation and switching
The AC side
Further information
CHAPTER 14: Inspection and testing
Initial verification
Periodic inspection
Detail of the installation to be inspected
Limitations on the inspection and testing
CHAPTER 15: Testing
Sequence of tests - initial verification
Sequence of tests - periodic inspection
Test procedures
Continuity of protective conductors
(Re + R2) method
R2 method
Continuity of ring final circuit conductors
Insulation resistance
Preconditions and precautions
Testing of low voltage circuits and FELV circuits
Testing of SELV and PELV circuits
By continuity methods (installation or circuit de-energized)
Verifying the polarity of an incoming supply (or an existing live circuit)
Protection by automatic disconnection of the supply (ADS)
Measurement of external earth fault loop impedance (Ze)
Earth electrode resistance
Prospective fault current at the origin
Circuit earth fault loop impedance (ZS)
Operation of RCDs
RCD testing
RCD test procedure
Verification of the RCD test results
Functional testing
Certification and reporting
Floor area covered
Maximum demand
Limiting lengths for final circuits
Reduced cross-section protective conductors
Maximum disconnection time
Lighting circuits (Table A2)
Radial final circuits supplying accessories to BS 1363 (Table A3)
Radial final circuits supplying a single load (Table A4)
Minimum permitted protective conductor sizes for energy limiting Class 3 circuit-breakers and RCBOs
Safe Isolation
Resistance of copper conductors
Conductor resistance values at a conductor temperature other than 20 °C
Calculation of conductor resistance at 30 °C
Conductor resistance at 70 C
Further information on conductor temperature correction multiplication factors

Tags: NICEIC Site Guide 100 A, NICEIC Guide

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