Messenger Wire

Definition

The power supply and support wire for the contact wire. This wire is fed from a power substation to a specified termination point. Typically, this wire is larger than the contact wire.

Purpose

Messenger wires provide both support and electrical power to contact wires in overhead electrical systems, such as those used for trains, trams, and trolleybuses. They ensure a stable and reliable power supply for the operation of these vehicles.

Examples of Use

• Rail systems: Supporting and supplying power to overhead contact wires for electric trains and trams.
• Trolleybus networks: Providing power and structural support to the overhead wires used by trolleybuses.
• Electrical distribution: Used in some aerial electrical distribution systems to support and power conductors.

Related Terms

• Contact Wire: The wire that transfers electrical power to the vehicle's pantograph or trolley pole.
• Catenary System: An overhead wire system that supplies electricity to trains and trams.
• Insulator: A component that prevents electrical conduction between the messenger wire and supporting structures.

Notes

• Messenger wires must be properly tensioned and supported to ensure reliable power transmission.
• They are typically made of durable, conductive materials such as copper or aluminum.
• Regular maintenance and inspection are necessary to prevent wear and ensure the safety and reliability of the overhead electrical system.