European Committee for Electrotechnical Standardization

Railway applications - Rolling stock - Electric equipment in trolley buses - Safety requirements and current collection systems
 N EN 50502

Annotation

This European Standard applies to electrical systems on board of vehicles of the type trolley bus, as defined in 3.1, fed with a nominal line voltage (Un) between 600 V d.c. and 750 V d.c.

This European Standard defines the requirements and constructional hints, especially to avoid electrical danger to the public and to staff. Where special requirements are existing for trolley buses, hints are given for mechanical and functional safety as well as for protection against fire.

This European Standard covers vehicles intended for public transport of persons. This Standard applies to:

- trolley buses,

- buses with current rail for guidance in the road surface,

- guided buses with bipolar roof current collector.

This European Standard does not apply to:

a) electric driven vehicles with only internal power supply:

1) hybrid vehicles,

2) diesel - electric vehicles,

3) fuel - cell vehicles,

4) battery vehicles,

b) vehicles with safe protective bonding:

1) rubber tyred commuter trains,

2) guided buses with supply by a separate current rail,