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BS EN 50122-1:2022

BS EN 50122-1:2022

$210.31

Railway applications. Fixed installations. Electrical safety, earthing and the return circuit – Protective provisions against electric shock

Published By Publication Date Number of Pages
BSI 2022 114
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This document specifies requirements for the protective provisions relating to electrical safety in fixed installations associated with AC and/or DC traction systems and to any installations that can be endangered by the electric traction power supply system. This also includes requirements applicable to vehicles on electrified lines. It also applies to all aspects of fixed installations which are necessary to ensure electrical safety during maintenance work within electric traction power supply systems. This document applies to new electric traction power supply systems and major revisions to electric traction power supply systems for: a) railways; b) guided mass transport systems such as 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) trolleybus systems, 5) electric traction power supply systems for road vehicles, which use an overhead contact line system, and 6) magnetically levitated systems, which use a contact line system; c) material transportation systems. This document does not apply to: a) electric traction power supply systems in underground mines, b) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the electric traction power supply system, c) suspended cable cars, d) funicular railways, e) existing vehicles. This document does not specify working rules for maintenance. The requirements within this document related to protection against electric shock are applicable to persons only.

PDF Catalog

PDF Pages PDF Title
2 undefined
10 1 Scope
11 2 Normative references
12 3 Terms and definitions
3.1 Electrical safety and hazards
14 3.2 Earthing and equipotential bonding
16 3.3 Return circuit
18 3.4 Electric traction power supply system
19 3.5 Contact line
22 3.6 Corrosion and corrosion protection
3.7 Current collection
23 3.8 Residual current devices
3.9 General terms
26 4 Contact line zone and current collector zone
4.1 Overhead contact line
29 4.2 Ground level conductor rail
4.3 Trolleybuses and road vehicles using an overhead contact line
30 4.4 Limitation of the zones
31 5 Protective provisions against direct contact
5.1 Preconditions
5.1.1 General
5.1.2 Design procedure
32 5.1.3 Electrical clearances
33 5.1.4 Standing surface
34 5.2 Protection by clearance
5.2.1 Calculation method for protection by clearance
35 5.2.2 Dimensions of clearances
37 5.2.3 Clearances for working persons
5.2.4 Warning signs
38 5.2.5 Minimum height of wires of an overhead contact line system above traffic areas
5.2.6 Clearances above standing surfaces on vehicles
5.2.7 Feeders above loading roads
5.2.8 Clearance between live parts of overhead contact line systems and trees and bushes
5.3 Protection by electrically protective obstacles
5.3.1 General
39 5.3.2 Common requirements for electrically protective obstacles
40 5.3.3 Methods for determining reach
5.3.3.1 General
41 5.3.3.2 Taut string line method
42 5.3.3.3 Manikin method
5.3.4 Requirements for electrically protective obstacles
5.3.4.1 Situations to be considered
5.3.4.2 Electrically protective obstacle design and construction requirements
48 5.3.5 Specific requirements for electrically protective obstacles in restricted areas
5.3.5.1 Situations to be considered
49 5.3.5.2 Electrically protective obstacle design and construction requirements
5.3.5.3 Situation at the end of electrically protective obstacle
5.3.6 Anti climbing provisions
5.4 Protection against direct contact with live parts mounted on vehicles
50 5.5 Protective provisions allowing working under live conditions
5.5.1 General
51 5.5.2 Overhead contact lines for railways beneath structures
5.5.3 Overhead contact lines for trolley busses and electric road vehicles beneath structures
5.5.3.1 Unearthed systems
52 5.5.3.2 Systems in which one of the contact wires is earthed or connected to the return circuit of a tramway system
53 5.6 Specific protective provisions against electric shock in ground level conductor rail systems
5.6.1 Location of conductor rail at platforms
5.6.2 Exceptions
5.6.3 Protection provisions in workshops and depots
54 5.6.4 Protective boarding for ground level conductor rails in restricted areas
5.6.5 Requirements for top contact ground level conductor rails in public areas
5.6.6 Requirements for top contact ground level conductor rails in restricted areas
57 5.7 Specific protective provisions against electric shock in systems in which the wheels of the vehicles are not used for return circuit
5.7.1 General
5.7.2 Railway systems
5.7.2.1 Use of the running rails as protective earth connection of vehicles
5.7.2.2 Systems in which the vehicles do not require to be connected electrically to the running rails
5.7.3 Trolleybus systems and systems for electric road vehicles
5.7.3.1 General
5.7.3.2 Unearthed systems
5.7.3.3 Earthed systems
5.7.3.4 Power supply of electric road vehicles connected to the power supply of a tramway
58 6 Protective provisions against indirect contact and non-galvanic coupling
6.1 General
6.2 Protective provisions for exposed-conductive-parts
6.2.1 AC railways
6.2.1.1 General
6.2.1.2 Exceptions in tunnels
59 6.2.2 DC railways
6.2.2.1 General
6.2.2.2 Exceptions in tunnels
6.2.3 Exceptions for low voltage electric traction power supply systems
6.2.3.1 General
6.2.3.2 Double or reinforced insulation of overhead contact line
6.2.3.3 Bonding of overhead contact line supporting structures to the return circuit
6.2.3.4 Precautions against the failure of ground level conductor rail insulators
60 6.2.4 Stays of non-conductive masts
6.3 Protective provisions for wholly or partly conductive structures in the overhead contact line zone or the current collector zone
6.3.1 Protective provisions by means of connection to the return circuit
61 6.3.2 Exceptions for small wholly and partly conductive parts
6.3.3 Exceptions for temporarily stored parts close to the rails
6.3.4 Protective provisions preventing contact between conductive parts and live parts
62 6.3.5 Protective provisions by means of bare conductive parts connected to the return circuit
6.3.6 Protective provisions by automatic disconnection of supply
6.4 Parts which can become hazardous due to inductive or capacitive coupling
7 Protective provisions for low voltage non-traction power supply systems
7.1 General
63 7.2 Protective provisions for electrical installations in the overhead contact line zone or the current collector zone
7.2.1 Equipment of protection Class I
65 7.2.2 Equipment of protection Class II
7.2.3 Cables
7.2.4 Low voltage connected equipment
7.3 Protective provisions for installations which are endangered by the traction power supply return circuit
7.3.1 Design of low voltage non-traction power supply
66 7.3.2 Low voltage power supply by a TT system on the railway side
69 7.3.3 Low voltage power supply by TN system
71 7.3.4 Low voltage power supply by IT system
73 7.3.5 Special provisions
7.3.5.1 AC railways
76 7.3.5.2 DC railways
8 Protective provisions where track systems, which are utilized for carrying traction return current, or/and overhead contact line systems pass through hazardous zones
8.1 General
77 8.2 Equipotential bonding
78 8.3 Parallel pipework
8.4 Insulating joints
8.5 Surge arrester
79 8.6 Overhead contact line of loading sidings
9 Limits for touch voltage and protective provisions against the danger of rail potential
9.1 General
9.1.1 Preconditions
9.1.2 Body voltage and touch voltage
9.1.3 Touch voltage at vehicles
80 9.1.4 Short-circuit duration
9.1.5 Voltage limits and time duration aspects
9.2 Touch voltage limits in AC railways
9.2.1 General
81 9.2.2 AC voltage limits for the safety of persons
9.2.2.1 Basic values of the body voltage Ub
82 9.2.2.2 Effective touch voltage limits
83 9.2.2.3 Workshops and similar locations
9.2.2.4 Provisions to reduce the risks from touch voltages
84 9.3 Touch voltage limits in DC railways
9.3.1 General
9.3.2 DC voltage limits for the safety of persons
9.3.2.1 Basic values of the body voltage
85 9.3.2.2 Effective touch voltage limits
86 9.3.2.3 Workshops and similar locations
9.3.2.4 Provisions to reduce the risks from touch voltages
87 9.4 Access Control
10 Additional requirements
10.1 Traction substations and traction switching stations
10.2 Cables
10.2.1 General requirements
88 10.2.2 Cables in AC electric traction power supply systems
10.2.3 Cables in DC electric traction systems
10.3 Extended return circuit connections and earthing conductors
10.3.1 General requirements
10.3.2 Continuity of the extended return circuit
89 10.3.3 Cross bonding of the return circuit
10.3.4 Railway systems in which the traction current is confined within insulated conductors
10.4 Removing of decommissioned contact lines
10.5 Means of achieving safe isolation between sections
10.6 Lightning protection
90 Annex A (normative)Clearances from standing surfaces for exceptional useon existing lines with restricted gauge
92 Annex B (informative)Typical layouts of protective obstacles
B.1 General
94 B.2 Examples
101 Annex C (normative)Warning sign
102 Annex D (informative)Guiding values for rail potential gradient
D.1 AC railways
103 D.2 DC railways
104 Annex E (informative)Effective touch voltage and body voltage with respect to the body current
E.1 Preconditions for the calculation
E.2 Impedances
E.2.1 Body impedance for AC and DC voltages
106 E.2.2 Additional resistances
107 E.3 Body current and related body voltage
E.3.1 General
108 E.3.2 AC electric traction power supply systems
109 E.3.3 DC electric traction power supply systems
110 Annex F (normative)Measurement methods for effective touch voltages
111 Annex G (normative)Use of voltage-limiting devices
G.1 General
G.2 Types
G.3 Technical requirements

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BS EN 50122-1:2022
$210.31