BS EN 50122-1 : 2011

1 Scope
2 Normative references
3 Terms and definitions
4 Contact line zone and current collector zone
5 Protective provisions against direct contact
6 Protective provisions against indirect contact
   and impermissible rail potential
7 Protective provisions for low voltage non
   traction power supplies
8 Protective provisions where track systems,
  which are utilized for carrying traction return
   current, or/and contact line systems pass
   through hazardous zones
9 Limits for touch voltage and protection against
   the danger of rail potential
10 Additional protective provisions
Annex A (informative) - Typical obstacles
Annex B (normative) - Warning sign
Annex C (informative) - Guiding values for rail
        potential gradient
Annex D (informative) - Effective touch voltage
        and body voltage with respect to the body
        current
Annex E (normative) - Measurement methods for
        effective touch voltages
Annex F (normative) - The use of voltage-limiting devices
Annex G (normative) - Special national conditions
Bibliography
Annex ZZ (informative) - Relationship between this
         European Standard and the Essential
         Requirements of EU Directive 2008/57/EC

Defines requirements for the protective provisions relating to electrical safety in fixed installations associated with a.c. and/or d.c. traction systems and to any installations that can be endangered by the traction power supply system.