I.S. CLC TS 50502:2007

1 General
  1.1 Scope
  1.2 Normative references
  1.3 Definitions
  1.4 Voltages
  1.5 Classification of the voltage bands
2 Trolley bus construction
  2.1 Protection and electrical safety criteria
  2.2 Electrical components in band III voltage (high voltage)
  2.3 Electric traction equipment
  2.4 Emergency running equipment (independent from OHL)
  2.5 Electrical components in band II voltage (medium voltage)
  2.6 Electrical components in band I voltage (low voltage)
3 Checks and tests
  3.1 General
  3.2 New trolley vehicles
  3.3 Overhauled trolley vehicles
  3.4 On-duty trolley vehicles (periodical checks)
  3.5 Leakage detectors
Annex A (normative) Constructional detailed provisions
      A.1 General
      A.2 Attachment of the connection system
      A.3 Insulations
      A.4 Ventilation
      A.5 Accessibility
      A.6 Location of the main breaker
      A.7 Income and outlet points of cables
      A.8 Cabling
      A.9 Test terminal board
      A.10 Pre-alarm leakage detecting device
      A.11 Equipment connected to different voltage band circuits
      A.12 Segregation of band III circuits
      A.13 Batteries
Annex B (normative) Trolley buses - Connection system to overhead
        contact lines
      B.1 Scope
      B.2 General characteristics
      B.3 Marking
      B.4 Checks and tests
      B.5 Inspections
      B.6 Electromagnetic compatibility
Annex C (normative) Constructional hints for connection systems
      C.1 General
      C.2 Material of the rods
      C.3 Current connections
      C.4 Joints
      C.5 Cable insulation
      C.6 Abnormal line height
Bibliography

Describes the requirements and constructional hints, especially to avoid danger of electrical kind to the public and to the personnel.