What Is Strand and Lashing?
Strand and lashing is the aerial method of hanging fiber cable on poles using a steel messenger strand and spiral-wrapped lashing wire. See how it works.
Strand and Lashing is an aerial fiber construction method that hangs fiber optic cable on utility poles. A galvanized steel messenger strand is strung and tensioned between poles, then the fiber cable is bound to that strand with a continuous spiral of lashing wire, applied by a mechanical lashing machine, so the strand (not the fiber) carries the wind, ice, and gravity load.
How Strand and Lashing Works
Crews first install a galvanized steel messenger strand between poles, sized for the span length, cable weight, and local ice and wind loading. The strand is tensioned and anchored to each pole with down guys or span guys as needed. A cable reel trailer then pays out fiber cable beneath the strand while a mechanical lashing machine rides the strand, wrapping a thin stainless steel or aluminum lashing wire around both the strand and cable in a continuous spiral. The lashing wire holds the cable firmly against the strand along the entire span, transferring wind and ice load to the strand rather than the fiber itself.
When Strand and Lashing Is Used
Strand and lashing is the standard build method for aerial fiber routes on joint-use pole lines shared with power and telecom utilities, especially where an existing strand is already in place and has spare capacity. It also applies to new strand installs along pole routes selected during route engineering. It is common in FTTx last-mile builds, rural and suburban distribution runs, and pole-line extensions feeding cell sites or business parks, anywhere aerial attachment is permitted and underground construction is not required or cost-effective.
Why Strand and Lashing Matters
The technique lets a network owner add, reinforce, or replace aerial fiber without disturbing pavement, easements, or buried utilities, which keeps unit costs and permitting timelines lower than trenching or directional boring. Because the strand carries the mechanical load, the fiber cable itself stays largely unstressed, extending service life and reducing splice failures from sag or wind fatigue. Correct strand tensioning, lashing wire pitch, and pole loading calculations (governed by NESC clearance and joint-use rules) are what keep an aerial route safe and compliant over decades of service.
Strand and Lashing, answered
What Is Strand and Lashing?
Strand and Lashing is an aerial fiber construction method that hangs fiber optic cable on utility poles. A galvanized steel messenger strand is strung and tensioned between poles, then the fiber cable is bound to that strand with a continuous spiral of lashing wire, applied by a mechanical lashing machine, so the strand (not the fiber) carries the wind, ice, and gravity load.
How is strand and lashing different from self-supporting (figure-8) cable?
Figure-8 cable has its own built-in steel messenger fused to the fiber jacket, so it installs without a separate lashing step. Strand and lashing uses a standalone messenger strand and wraps the fiber to it afterward, which costs more labor but lets crews reuse existing strand and adjust cable counts over time.
Why use strand and lashing instead of underground construction?
Strand and lashing is faster to build and far cheaper per foot than trenching or boring, since it uses existing pole lines instead of opening pavement or right-of-way. It is the default choice for pole-rich corridors where make-ready and permitting allow aerial attachment.
What does strand and lashing cost compared to other aerial methods?
Costs run per foot and scale with pole spacing, strand tension class, and crew productivity, typically well below directional boring or open-cut trenching. Make-ready work (pole surveys, permits, joint-use agreements) is usually the larger cost driver than the lashing labor itself.