Guidance Note 2: Isolation and Switching (IEE Guidence Notes) (No 2)

✍ Scribed by Institution of Electrical Engineers

• Publisher: Institution of Electrical Engineers
• Year: 2003
• Tongue: English
• Leaves: 73
• Series: IEE Guidence Notes No 2
• Edition: 4th edition
• Category: Library

✦ Synopsis

A series of Guidance Notes has been issued, each of which enlarges upon and amplifies the particular requirements of a part of BS 7671:2001 (IEE Wiring Regulations, 16th Edition). Each of these Guides is extensively cross-referenced to the Regulations thus providing convenient and ready access. Some Guidance Notes contain information not included in the 16th Edition but which was included in earlier editions of the IEE Wiring Regulations. All the guides have been updated to align with BS 7671: 2001.

✦ Table of Contents

CONTENTS......Page 3
CO-OPERATING ORGANISATIONS......Page 5
ACKNOWLEDGEMENTS......Page 6
PREFACE......Page 7
INTRODUCTION......Page 8
1.2 Health and Safety at Work etc Act 1974......Page 10
1.3 Electricity at Work Regulations 1989......Page 11
1.5 Machinery Safety Directive......Page 12
1.7 Construction (Design and Management) Regulations 1994......Page 15
1.9 Provision and Use of Work Equipment Regulations 1998......Page 16
2.1 General......Page 18
2.2 Isolation......Page 19
2.3 Switching off for mechanical maintenance......Page 20
2.6 Functional switching......Page 21
2.8 Summary of principles......Page 22
TABLE 2.1 Examples of utilization categories for low voltage switchgear and controlgear......Page 23
TABLE 2.2 Relevant Regulations in BS 7671......Page 25
Fig 2.2: Lock-out bags and boxes......Page 28
Fig 2.3: Label for equipment with two supplies......Page 29
TABLE 2.3 Warning notices and identification labels required by BS 7671 : 2001 in connection with isolation and switching......Page 30
Fig 3.1.2: The symbol for a circuit breaker suitable for isolation......Page 31
3.2 Isolation, basic requirements......Page 33
3.3 Location and identification of isolating devices......Page 34
Fig 3.2 Remote lockable isolator......Page 35
3.4 Securing the means of isolation......Page 36
3.5 Isolation at the origin of the installation......Page 38
Fig 3.3 Single-phase systems, isolation at the origin of the installation......Page 39
Fig 3.4 d.c. systems isolation at the origin of the installation......Page 40
Fig 3.5 Three-phase systems, isolation at the origin of the installation......Page 41
Fig 3.6 Examples of provision of Isolation of circuits within an installation......Page 42
3.7 Isolation of the neutral conductor......Page 43
Generators......Page 45
Street furniture......Page 46
Motors......Page 47
Fig 3.7 Motor with readily accessible starter and local isolator......Page 48
4.1 General......Page 51
Fig 4.1 Example of switching off for mechanical maintenance......Page 53
4.4 Luminaires......Page 54
5.1 General......Page 55
Type C standards: Machine safety standards......Page 56
Category 4:......Page 57
5.2 Basic considerations......Page 58
Category 2:......Page 59
Workshops......Page 61
5.3 Means of emergency switching......Page 62
Fig 5.1 Example of an emergency switch......Page 63
6.2 Control systems......Page 64
6.3 Devices for functional switching......Page 65
Fig 6.1 A light switch - functional switching......Page 66
7.2 Location and identification of fireman's switches......Page 67
Fig 7.2 Nameplate for a fireman's switch......Page 68
D......Page 69
I......Page 70
M......Page 71
S......Page 72
W......Page 73
Tables & figs......Page 0