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BS EN 50122-1:2022 – TC:2023 Edition

BS EN 50122-1:2022 – TC:2023 Edition

$280.87

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

Published By Publication Date Number of Pages
BSI 2023 272
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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
1 30465377
158 A-30430758
159 undefined
167 1 Scope
168 2 Normative references
169 3 Terms and definitions
3.1 Electrical safety and hazards
171 3.2 Earthing and equipotential bonding
173 3.3 Return circuit
175 3.4 Electric traction power supply system
176 3.5 Contact line
179 3.6 Corrosion and corrosion protection
3.7 Current collection
180 3.8 Residual current devices
3.9 General terms
183 4 Contact line zone and current collector zone
4.1 Overhead contact line
186 4.2 Ground level conductor rail
4.3 Trolleybuses and road vehicles using an overhead contact line
187 4.4 Limitation of the zones
188 5 Protective provisions against direct contact
5.1 Preconditions
5.1.1 General
5.1.2 Design procedure
189 5.1.3 Electrical clearances
190 5.1.4 Standing surface
191 5.2 Protection by clearance
5.2.1 Calculation method for protection by clearance
192 5.2.2 Dimensions of clearances
194 5.2.3 Clearances for working persons
5.2.4 Warning signs
195 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
196 5.3.2 Common requirements for electrically protective obstacles
197 5.3.3 Methods for determining reach
5.3.3.1 General
198 5.3.3.2 Taut string line method
199 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
205 5.3.5 Specific requirements for electrically protective obstacles in restricted areas
5.3.5.1 Situations to be considered
206 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
207 5.5 Protective provisions allowing working under live conditions
5.5.1 General
208 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
209 5.5.3.2 Systems in which one of the contact wires is earthed or connected to the return circuit of a tramway system
210 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
211 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
214 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
215 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
216 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
217 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
218 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
219 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
220 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
222 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
223 7.3.2 Low voltage power supply by a TT system on the railway side
226 7.3.3 Low voltage power supply by TN system
228 7.3.4 Low voltage power supply by IT system
230 7.3.5 Special provisions
7.3.5.1 AC railways
233 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
234 8.2 Equipotential bonding
235 8.3 Parallel pipework
8.4 Insulating joints
8.5 Surge arrester
236 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
237 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
238 9.2.2 AC voltage limits for the safety of persons
9.2.2.1 Basic values of the body voltage Ub
239 9.2.2.2 Effective touch voltage limits
240 9.2.2.3 Workshops and similar locations
9.2.2.4 Provisions to reduce the risks from touch voltages
241 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
242 9.3.2.2 Effective touch voltage limits
243 9.3.2.3 Workshops and similar locations
9.3.2.4 Provisions to reduce the risks from touch voltages
244 9.4 Access Control
10 Additional requirements
10.1 Traction substations and traction switching stations
10.2 Cables
10.2.1 General requirements
245 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
246 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
247 Annex A (normative)Clearances from standing surfaces for exceptional useon existing lines with restricted gauge
249 Annex B (informative)Typical layouts of protective obstacles
B.1 General
251 B.2 Examples
258 Annex C (normative)Warning sign
259 Annex D (informative)Guiding values for rail potential gradient
D.1 AC railways
260 D.2 DC railways
261 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
263 E.2.2 Additional resistances
264 E.3 Body current and related body voltage
E.3.1 General
265 E.3.2 AC electric traction power supply systems
266 E.3.3 DC electric traction power supply systems
267 Annex F (normative)Measurement methods for effective touch voltages
268 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 - TC
$280.87