Practitioners Guide to Temporary Power System Edition 2019 (PDF)

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About the book

First edition 2019
Pages: 121
Publisher: IET
Language: English
Size: 45 Mb

The IET publication Temporary Power Systems: A guide to the application of BS 7671 and BS 7909 for temporary events, published in 2013, has been a helpful source of information for many working in the industry.

Feedback from various training courses and comments made by technicians on the ground made it apparent that a location guide aimed at temporary systems, in a similar format to the ever-popular iET On-Site Guide for installations, would be beneficial. The aim of this Guide is to provide concise requirements for interpretation in the field, referring the reader back to the appropriate standards for more information as necessary.

There have been many changes to BS7671 since the original Guide was published; the law has changed too. The Construction (Design and Management) Regulations were updated in 2015 and events and entertainment are firmly within its scope. The effect of this has been to increase awareness of the management of electrical safety at events and the use of BS7909 accordingly.

The 18th Edition of The IET Wiring Regulations, BS 7671:2018, has introduced several changes to the way temporary electrical systems should be designed. It came into effect on 1st January 2019 and installations designed or deployed after 31st December 2018 must comply. Examples of the range of changes are revised disconnection times for sockets up to 63 A, the requirement for surge protective devices, cable management requirements, significant changes to Chapter 53 covering isolation, switching control and monitoring and a new Chapter 46 dealing with isolation and switching. Energy efficiency has been included in Appendix 17 and there is a new Standard (BS IEC60364-8-1) with further information.

This Guide has taken these changes into account. It will, I hope, give the reader a quick reference guide, enabling them to put systems together quickly and, most importantly, ensuring that they work safely and effectively.

Content

Contributions by organizations and individuals
Preface
Section 1 Introduction
1.1 Overview
1.2 Scope
1.3 Applicable legislation
1.4 Applicable standards and industry guidance
1.5 Basin: information required
1.6 Temporary distribution planning considerations
Section 2 The electrical supply
2.1 Sources of supply
2.2 Generators
2.3 Multiple sources
2.4 Transformers in temporary systems
2.5 Neutral inversion
Section 3 Earthing and bonding
3.1 Protective earthing
3.2 Legal requirements
3.3 Protective bonding of extraneous-conductive-parts
3.4 Earthing conductor and main protective bonding conductor cross-sectional area5
3.5 Additional protection-Supplementary equipotential bonding
3.6 Earth electrodes
3.7 Types of earth electrode
Section 4 Protection
4.1 Types of protective device
4.2 Overload protection
4.3 Fault current protection
4.4 Protection against electric shock
4.5 Residual current devices (RCDS)
4.6 Surge protective devices (SPDs)
4.7 Mechanical protection and cabling selection
Section 5 Isolation and switching
5.1 Isolation
5.2 Functional switching
5.3 Emergency switching
5.4 Switching off for mechanical maintenance
Section 6 Power quality and energy efficiency 53
6.1 Power factor and generator operation
6.2 Harmonies symptoms
6.3 Harmonies - design considerations
Section 7 Special locations and emergency requirements
7.1 Summary of requirements
7.2 Wet locations
7.5 Exhibitions, shows and stands
7.4 Construction sites
7.5 Mobile and transportable units
7.6 Emergency lighting
7.7 Resilience planning
Section 8 Inspection and testing
8.1 Safe isolation procedure
8.2 Verification and the application of BS 7671 vs BS 7909
8.3 Equipment testing (portable appliance testing - PAT)
8.4 Inspection of the temporary distribution
8.5 Testing the temporary distribution
8.6 Operation and testing of residual current circuit-breakers (RCCBs) and RCBOs
8.7 Documentation
8.8 Testing small and simple systems
8.9 Tests following changes or relocation
Section 9 Example of temporary systems
9.1 Generator and four portable buildings with work area lighting
9.2 Generator-powering equipment inside a venue with a separate electrical system
9.3 Multiple generators at an event
9.4 Catering van or trailer
9.5 Street fair supplied from street furniture
9.6 Earthing of parallel generator sets
Appendix A Maximum permissible measured earth fault loop impedance
Appendix B Current-carrying capacities and voltage drop for common flexible cables
Appendix C Resistance of copper and aluminum conductors
Appendix D Circuit-breaker operating curves
Appendix E Operating times of RCDs to BS EN 61008 & BS EN 61009
(including DC performance characteristics)
Appendix F BS 7909 model forms
Appendix G Schedule of Test Results
Index

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