A messenger is the linear supporting member, usually high-strength steel wire, used to carry the weight of a suspended aerial cable, either integral to the cable or external to it.
A messenger is the strong support element that bears the mechanical load of an aerial cable suspended between poles or structures. Typically made of high-strength steel wire, it carries the tension and weight that the communication or power conductors themselves are not designed to bear. The messenger may be built into the cable as an integral part or run as a separate member to which the cable is attached.
By taking the mechanical load, the messenger allows the conductors to span distances overhead without being stressed, protecting them from the tension that would otherwise damage them. This separation of mechanical support from electrical function is fundamental to how aerial cable is constructed and suspended in commercial and industrial settings.
The strength and integrity of the messenger are essential to the reliability of an aerial run, since it must withstand wind, ice, and temperature changes over long spans. Cable designed for aerial use is built with this support relationship in mind, whether the messenger is integral or external.
Because the support member carries loads that the conductors cannot, the strength and condition of the messenger are central to the reliability of an aerial run, particularly over long spans exposed to wind, ice, and changing temperatures.
At Windy City Wire, an understanding of cable constructions, including aerial designs with messengers, reflects a focus on matching cable to its application. Recognizing how a messenger supports suspended cable helps illustrate the engineering behind products built for demanding overhead environments.