NR BR 903 ISSUE 1 PDF

This specification covers the signal head wiring and the varioue items of equipment required for a complete electrical system for lighting and proving lcmps in colour light signals.

This specification will attempt to ensure that all of the items and the wiring will be compatible regardless of the supplier.

The items of equipment covered by this specification are:-

Lamp.

Lamp Holder.

Lamp Lighting Transformer.

Filament Changeover Relay, for non flashing aapects.

Filament Changeover Unit, for non flashing aspects.

Lamp Proving Relay.

Signal Head Wiring & Terminals.