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BS 7909:2023+A1:2024

BS 7909:2023+A1:2024

$215.11

Temporary electrical systems for entertainment and related purposes. Code of practice

Published By Publication Date Number of Pages
BSI 2024 120
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PDF Catalog

PDF Pages PDF Title
7 Foreword
9 0 Introduction
1 Scope
10 2 Normative references
11 3 Terms and definitions
20 4 Management of an event and supply of equipment for temporary electrical systems
4.1 Management of the event
21 4.2 Outlining the parameters of the event
4.3 Responsibility for the temporary electrical system(s)
22 4.4 Early planning
4.5 Provision of equipment
4.5.1 Supply of equipment for events
23 4.5.2 Responsibilities of owners or suppliers of equipment
5 Small/simple events and activities requiring up to 6 kVA
5.1 General
24 5.2 Person responsible
5.3 Planning the small/simple temporary electrical system
25 5.4 Risk assessments
5.5 Supplying and checking equipment
5.6 Setting-up a small/simple temporary electrical system
26 5.7 Changes to the system
5.8 Leaving the system unattended
5.8.1 General
5.8.2 Person responsible leaving the system
5.9 Removing the system
5.10 Problems with the installed electrical system
27 6 Large/complex events and activities requiring in excess of 6 kVA
6.1 Responsibility
6.1.1 Person responsible
6.1.2 Allocation of responsibility
28 6.1.3 Principle responsibilities
6.1.3.1 General
6.1.3.2 System design
6.1.3.3 Site work
29 6.1.3.4 Inspection, testing and certification
6.1.3.5 Operation
6.1.3.6 Removal of equipment
30 6.2 Electrical supply
6.2.1 Supplies required
6.2.2 Electrical supplies from installed sources
31 6.3 Risk assessments
6.4 Equipment
6.4.1 General
6.4.2 Specialist equipment
6.4.3 Specific electrical requirements
32 6.5 Crew
7 Design and instructions for temporary electrical systems
7.1 Design
7.1.1 General
7.1.2 Principles of the temporary distribution
33 7.2 Electrical supplies
7.2.1 Source of supply
7.2.2 Generators as a source of supply
34 7.2.3 Responsibility for connection to a supply
7.3 Cables and connectors
7.3.1 General
35 7.3.2 Identification of conductors and single-pole connectors
7.3.3 Cables
Table 1 — Marking of conductors and single-pole connectors
36 7.3.4 Connectors
7.3.4.1 General
37 7.3.4.2 Single-pole connectors
Table 2 — Connector types
38 7.3.4.3 Connections
7.3.4.4 Connection to busbars
7.3.4.5 Multipole connectors
7.4 Earthing and protective bonding
7.4.1 General
7.4.2 Generator earthing
7.4.2.1 General
39 7.4.2.2 Generator earthing required
7.4.2.3 Generator earthing not required (IN-S)
40 7.4.2.4 TN-C-S or PME supplies and mobile and transportable units
7.4.3 Interconnection of earthing systems
41 7.4.4 Protective bonding
7.5 Overcurrent protection for temporary systems
7.6 RCDs in temporary systems
43 7.7 Surge protective devices (SPDs)
7.7.1 Requirement for SPDs
7.7.2 Where SPDs are installed
44 7.7.3 Testing of systems with SPDs
7.8 Equipment forming the temporary electrical system
Table 3 —  Minimum IP protection (with all covers in place)
45 7.9 Machinery
7.10 Luminaires
7.11 Electronic equipment used for control and power-processing
7.12 Sub-systems for associated services
7.13 Protection against unauthorized use
46 7.14 Safety systems
7.14.1 Communications systems
7.14.2 Supplies for safety services
7.14.3 Warning signs
7.15 Weather conditions
7.16 Removal of temporary electrical systems
7.17Electrical energy storage systems and hybrid generators for the provision of low voltage AC supplies
7.17.1 General
47 7.17.2 System design
7.17.3 Energy sources
7.17.4 Provision of information
48 7.17.5 Performance characteristics
8 Work on site
8.1 General
49 8.2 Responsibilities
8.3 Design assessment
8.4 Equipment assessment
8.4.1 General
8.4.2 Test and identification before delivery
8.4.3 Inspection of equipment on site
8.5 Live working
8.6 Connection to power supplies
8.6.1 General
50 8.6.2 Verification of supplies
8.6.3 Connection using plugs and sockets
8.6.4 Connection using single-pole connectors
8.6.5 Connection using open-tails
8.6.6 Connection to supplies obtained from busbars
8.6.7 Isolation and switching
8.7 Fundamental checks
8.7.1 Polarity check
8.7.2 Phase-sequence
51 8.7.3 Earth fault loop impedance
8.7.4 RCDs
8.7.5 Neutral/earth indication
8.7.6 Protective earthing and bonding arrangements
8.8 Protection against damage and interference
8.8.1 Cables
52 8.8.2 Switchgear, distribution units and other equipment
53 8.9 Safe working practice
8.9.1 Identification and isolation of circuits
8.9.2 Knowledge of site emergency procedures
8.9.3 Unattended system
8.9.4 Access covers
54 8.9.5 Faulty equipment
8.9.6 Working, safety and emergency lighting
8.9.7 Hand-held mains-powered equipment
8.9.8 Overriding RCDs
8.10 Communications
8.11 Weather conditions on site
55 8.12 Hazardous sites
8.13 Medical areas or locations
8.14 Agricultural areas
56 8.15 Signs and warning notices
8.16 Removal of temporary electrical systems after use
9 Inspection and testing
9.1 General
9.2 Person responsible
9.3 Records, results and certificates
9.3.1 Initial verification
57 9.3.2 In-service inspection and testing
9.4 Test and identification of equipment before delivery
9.5 Electrical systems brought by facilities providers
9.6 Supplies to facilities providers
58 9.7 Visual inspection
9.8 Tests
9.8.1 General
59 9.8.2 Equipment tests prior to arrival on site
9.8.3 System tests on site
60 9.8.4 RCD setting and checking
9.9 Onsite assembly or modification
9.9.1 Units assembled on site
9.9.2 Equipment repaired or modified on site
10 Operational procedures
10.1 Competent person present
10.2 Regular inspection
10.3 Supervision of temporary systems for safety
61 10.4 Site security
10.5 Site emergency services or procedures
10.6 Non-load making and breaking connectors
10.7 RCD Override
11 Additional considerations
11.1 Protection against lightning
62 11.2 Discharge of static electricity
63 Annex A (normative) Construction of distribution equipment or switchgear for temporary systems
A.1 General
A.2 Construction
64 A.3 Electrical construction
A.4 Single-pole connector-cable combinations
65 Annex B (informative) Distribution equipment functionality
B.1 Intake switch unit (ISU)
66 B.2 Central distribution unit (CDU)
67 B.3 Cable splitter unit (CSU)
B.4 Final distribution unit (FDU)
B.5 Current-using equipment
B.6 Indicator lamps and polarity verification devices
68 Table B.1 — Indicator colours
B.7 Labels
Annex C (informative) Earthing arrangements and temporary systems
C.1 General
69 C.2 Electrical environment
70 C.3 Earthing arrangements
C.4 Installed sources of supply and earthing arrangements
C.4.1 General
71 C.4.2 TN-S and permanent systems
C.4.3 TN-C-S
C.4.3.1 General
C.4.3.2 Open circuit PEN (PEN failure) in the distribution provided by the DSO
72 C.4.3.3 Earthed signal cables and PME supplies
73 C.4.3.4 TN-C-S as installed in domestic and smaller commercial, industrial and similar premises
C.4.3.5 TN-C-S as installed in larger commercial, industrial, public and sports premises
C.4.3.6 TN-C-S and temporary systems extending the supply outside the electrical environment of the installed source
C.4.3.6.1 TN-C-S source as described in C.4.3.3
C.4.3.6.2 TN-C-S source as described in C.4.3.4
C.4.3.6.3 TN-C-S source supplying a mobile or transportable unit
C.4.3.6.4 TN-C-S source, supplementary earth electrode for the temporary system
74 C.4.3.6.5 TN-C-S source, used in TT form
C.4.4 TT
C.4.5 IT
75 C.5 Generators as sources of supply and earthing arrangements
C.5.1 General
C.5.2 Generated output that is not associated with another electrical environment
C.5.3 Generated output that is associated with or enters another electrical environment
C.5.3.1 Generator outdoors supplying equipment within a building
C.5.3.1.1 General
C.5.3.1.2 Installed system is of TN-S or TT form
76 C.5.3.1.3 Installed system is or is assumed to be TN-C-S
C.5.3.2 Generator outdoors supplying equipment outdoors that is connected through earthed signal cables to equipment supplied from the installed system
C.5.3.2.1 General
C.5.3.2.2 Installed system is of TN-S or TT form
C.5.3.2.3 Installed system is of TN-C-S or assumed to be TN-C-S in form
C.5.3.3 Generator outdoors supplying equipment outdoors associated with other equipment outdoors that is supplied from the installed system of an adjacent building
C.5.3.3.1 Installed system is of TN-S or TT form
77 C.5.3.3.2 Installed system is of TN-C-S or assumed to be TN-C-S in form
C.5.3.4 Generator acting as an alternative to, or an augmenting supply to, an installed electrical system
C.5.4 Additional information about earthing generators
C.6 Earth electrodes used in a temporary system
C.6.1 General
78 C.6.2 Effective connection to the general mass of Earth
C.6.3 Supplementary connection to the general mass of Earth
Annex D (informative) Possible arrangements for temporary electrical systems
D.1 General
79 D.2 Use of expressions
D.2.1 Touch voltages
D.2.2 Earth
80 Figure D.1 — Temporary electrical system: typical event/theatre/concert arrangements
81 Figure D.2 — Temporary electrical system: typical film/TV location
82 Figure D.3 — Temporary electrical system: typical major event or festival
83 D.3 Temporary electrical system for a typical event, theatre or concert arrangement
D.4 Temporary electrical system for a typical film/TV location
86 D.5 Temporary electrical system for a typical major event or festival
88 D.6 Conditions with a fault present
Annex E (informative) Residual current devices (RCDs): selection and use
E.1 What is an RCD and what does it do?
E.2 Types of RCDs
E.2.1 General
89 Table E.1 — Types of RCDs
E.2.2 RCD type AC, A, B and F
90 Table E.2 — Fault currents
91 Table E.3 — RCD symbols
E.2.3 Older installations with ELCBs
E.2.4 Recognized standards for RCDs
92 Table E.4 — RCD standards
E.2.5 Characteristics of RCDs
E.2.6 Auto-reclosing RCDs and residual current monitors
E.2.7 RCD use outside of the UK
93 E.3 Applications
E.3.1 General
Table E.5 — RCD applications
94 E.3.2 Unwanted operation
E.3.3 Selectivity
E.4 Testing
E.4.1 General
E.4.2 Range of tests
95 Table E.6 — Test criteria
E.4.3 Test button (T button)
E.5 Test instrument
E.6 Measuring earth fault loop impedance on a circuit with RCD protection
96 Annex F(informative)Supplies provided for temporary distributions at venues
F.1 Principal issues related to temporary distributions
F.2 Installed source of supply for temporary distribution at venues
F.2.1 General
F.2.2 Venue representative
97 F.2.3 Earthing arrangement
F.2.4 Conductors supplying the point of connection for temporary distributions
F.2.5 Method of connection to a venue’s installed source
F.2.5.1 General
F.2.5.2 Switched fuse as the means of connection
F.2.5.3 Connectors as the means of connection
98 F.2.5.4 Circuit protective devices
F.2.5.5 Additional earth terminal for temporary distributions
Figure F.1 — Typical section of a keyed single-pole connector (KSPC)
99 F.3 Information and labelling of points of connection for the temporary distribution
Figure F.2 — Example of label for sources of supply
F.4 Power rating versus circuit-breaker and RCD rating
100 Table F.1 — Connectors, circuit-breaker and RCD ratings at the venue
Annex G (normative) Inspection, testing and certification
G.1 General
101 G.2 Small/simple temporary electrical systems
G.2.1 Inspecting and testing of the source of supply
G.2.2 Inspection of equipment forming the temporary electrical system
G.2.3 Inspection of a completed temporary electrical system
G.2.4 Testing the temporary electrical system and RCDs
G.2.5 Documentation
G.3 Large/complex temporary electrical systems
102 G.3.1 Duration of the temporary electrical system
G.3.1.1 General
G.3.1.2 Short duration temporary systems
G.3.1.3 Long duration temporary systems
G.3.1.4 Existence of temporary systems extended for longer than planned
G.3.1.5 Temporary systems associated with touring events
103 G.3.2 Details of the source of supply
G.3.3 Inspection and testing of the source of supply
G.3.4 Inspection of equipment forming the temporary electrical system
G.3.5 Inspection of a temporary electrical distribution
104 G.3.6 Testing the temporary electrical distribution
G.3.7 Testing RCDs and setting adjustable RCDs
G.3.8 Documentation
107 Figure G.1 — Model completion certificate
109 Figure G.2 — Model Schedule of Circuit Details and Test Results
110 Figure G.3 — Model confirmation of electrical completion
111 Annex H (informative) Multi-pole connectors used for lighting and other applications
H.1 General
H.2 Extension cables
H.3 Fan-in adaptors (male spiders)
H.3.1 Rectangular 16 pin type
H.3.2 Circular 19 pin type
112 H.4 Source equipment and distribution panels
H.5 Type jumpers
H.6 Fan-out adaptors (female spiders, stage boxes, internally wired bars)
H.7 Sequencing reversing adaptors
H.8 16-pole rectangular connector systems
113 Table H.1 — Rectangular 16-pole connector wiring configurations
Table H.2 — Common rectangular 16-pole connector wiring configuration by country and manufacturer
114 H.9 19-pole circular connector systems
Table H.3 — Circular 19-pole connector wiring configurations
115 Table H.4 — Common circular 19-pole connector wiring configuration by country and manufacturer
H.10 Overseas touring with multicores
H.11 32 A Seven pin three-circuit connector
Figure H.1 —  Seven pin three-circuit connector
116 Table H.5 — Seven pin three-circuit connector
Annex I (informative) Power quality in electrical systems
118 Bibliography

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BS 7909:2023+A1:2024
$215.11