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Cables come in a wide variety of types and sizes and can be made from many different materials.
Selecting the right cable is important for the safety of an installation and to provide an efficient and effective electrical or communications system.
Cable management systems (CMS) are a series of components and systems used to support, protect and route cables from their source to where the power or information is needed, safely and securely.
This is a comprehensive guide to the different types of cables used in electrical and telecommunications installations.
In addition, it provides information on CMS and on the good cable installation practice that ensures sale electrical installations.
It should be noted that this is not a design guide. Where applicable, guidance has been given on certain design aspects, but reference should always be made to BS 767112018 Requirements for Electrical Installations (IET Wiring Regulations, 18th Edition) for definitive design requirements.
BS 7671 is a joint publication of the British Standards institution (BSI) and the Institution of Engineering and Technology (IET). This guide is one of several publications prepared by the IET to provide guidance on certain aspects in relation to BS 767132018 Electrical installations in the United Kingdom must comply with relevant statutory regulations, such as the Electricity at Work Regulations 1989 (EAWR), the Building Regulations and, where re f evant, the Electricity Safety, Quality and Continuity Regulations 2002 (ESQCR).
This guide provides an overview of the complex regulatory provisions in this area, including, but not exclusively:
(a) the Health and Safety at Work etc. Act 1974,
(b) the EAWR;
(c) the Building Regulations,
(d) the ESOCR;
(e) the Restriction of the Use of Certain Hazardous Substances in Electrical Equipment Regulations (Restriction of Hazardous Substances Regulations - RoHS),
(f) the Construction Products Regulations (CPR),
(g) the Waste Electrical and Electronic Equipment Regulations (WEEE),
(h) the Low Voltage Directive (LVD).
The changes brought about by the UK's decision to leave the EU and the accompanying legislation may result in some of the EU legislation quoted in this guide being superseded by subsequent UK legislation.
It is anticipated that the legislation as it stands will remain in force, but reference to HM Government websites is recommended when referring to the legislation quoted.
This IET Guide provides a solid grounding on the breadth of cables and cable management systems, covering both electrical supply, communications and control technologies, for traditional and special applications. The Guide is commended to those training to make specification decisions, and as a refresher to those wishing to keep up with current developments.
The evolution of cables and commonly encountered cable types
HSE Approved Codes of Practice
Standards, non-statutory regulations and guidance
2 Electrical installation design
3 Cable Selection
Insulation and sheathing materials
Fixed and flexible cable installations
DC wiring systems
4 Joints, terminations and connections
Regulatory requirements of the EAWR and non-statutory requirements of BS 7671
Cable terminations, connectors, joints and accessories
Good installation practice
5 Cable fire performance
Fire risk and cable requirements
Reaction to fire
Fire performance, class and the CPR
Declaration of performance and labeling
Resistance to fire (circuit integrity)
Fire alarm circuits
6 Telecommunications cables
Telecommunications cabling technologies
Hertz and bits
Metallic telephony cables
Construction of coaxial, twin-axial and trivial cables
Optical fibre cable
7 Specialist cables
Industrial control and building management cables
Electric vehicle charging
8 Cable management systems (CMS)
Cable management and containment
Wiring system fixing and fittings
Modular wiring systems
Conduit and trunking cable capacities
Ingress protection (IP) rating
Cable systems: installation
9. Standard or pre-designed circuits
Cable installation methods
Grouping of circuit cables
Floors and ceilings
Installation of cable on cable tray or ladder
Packaging, storage and handling
10 Substandard and counterfeit cables
Abbreviations and Glossary
Further reading and useful information