How to Select ADSS Cable Span
ADSS span selection is not based only on the distance between two poles. The correct cable design must account for wind, ice, temperature, sag, tensile load, cable weight, route geometry, clearance and installation safety factors.
Updated June 22, 2026 · MapleArashi Engineering Guide
Quick Answer
Start with the longest pole-to-pole span, but do not select the cable from span distance alone. Confirm route temperature, wind speed, ice loading, cable weight, sag and clearance limits, attachment height, pole strength, installation tension and required safety factors. Final span capability must be confirmed for the selected ADSS construction.
What Does ADSS Span Mean?
ADSS span is the horizontal distance between two supporting structures, such as utility poles or towers. A route may include many different span lengths, including normal spans, road crossings, river crossings or unusually long sections.
The longest individual span is important, but the design may also need to consider the ruling span, route profile, elevation changes and the mechanical effect of adjacent spans.
Eight Inputs Required Before Selecting ADSS Span
1. Pole Distance
Provide the average span, longest span and any special crossings.
2. Wind Load
Wind creates lateral loading and increases cable tension and pole loading.
3. Ice Load
Ice increases cable diameter, weight and combined wind-loading exposure.
4. Temperature Range
Temperature changes affect cable length, sag and mechanical tension.
5. Sag and Clearance
Ground, road, building and conductor clearances must remain compliant.
6. Cable Weight
Fiber count, diameter and construction affect self-weight and span loading.
7. Tensile Limits
Installation and operating loads must remain within the approved design limits.
8. Pole and Hardware Capacity
Poles, towers, clamps and dead-end hardware must support the calculated loads.
Why Pole Distance Alone Is Not Enough
Two projects with the same pole spacing may require different ADSS cable designs. A route with stronger wind, heavier ice, greater elevation variation or tighter clearance requirements can create much higher mechanical loads.
The same nominal span can therefore require a different aramid yarn configuration, cable diameter, rated tensile performance, sag target or attachment hardware.
How Sag Affects ADSS Selection
Sag is necessary because an aerial cable cannot be installed as a rigid straight line between two structures. Insufficient sag can create excessive tension. Excessive sag can violate ground or road clearance requirements.
The selected sag must balance mechanical load, route clearance, installation tension, temperature variation and environmental loading. Final sag and tension values should be calculated for the project route.
How Wind and Ice Change the Required Cable Design
Wind applies lateral pressure to the cable. Ice adds weight and may also increase the projected cable surface exposed to wind. Combined wind and ice conditions can therefore produce substantially higher tension than the unloaded cable condition.
Buyers should provide the applicable wind speed, ice thickness or loading condition and project design standard rather than requesting a cable only by fiber count and span.
ADSS Fiber Count and Span
Fiber count can affect cable diameter, cable weight and internal structure, but fiber count alone does not determine span capability. Two ADSS cables with the same fiber count may have different tensile performance because of different tube arrangements, aramid yarn quantities, sheath thicknesses and overall construction.
Always request the complete mechanical specification for the proposed cable rather than assuming that all cables with the same core count have the same span performance.
PE or AT Sheath: Does It Change the Span?
PE and AT sheath selection primarily concerns the electrical environment and resistance to electrical tracking. It should not be treated as the main span-selection factor.
Span capability depends on the complete mechanical construction. For electric-field and jacket selection, read the ADSS PE sheath versus AT sheath guide .
ADSS Span Selection Workflow
- Survey the route and record every pole-to-pole distance.
- Identify the longest span and special crossings.
- Confirm wind, ice and temperature design conditions.
- Confirm attachment height, clearance and allowable sag.
- Confirm fiber count, fiber type and sheath requirement.
- Review cable weight, tensile performance and hardware.
- Complete sag, tension and pole-loading calculations.
- Approve the final cable construction before production.
Use the aerial fiber optic cable engineering checklist for the broader route and installation review.
Information Required for an ADSS Span Quotation
- Average span and longest span
- Route drawing or pole schedule
- Wind speed and applicable loading standard
- Ice thickness or ice-loading requirement
- Minimum and maximum temperature
- Required sag or minimum clearance
- Pole or tower type and attachment height
- Fiber count and fiber type
- PE or AT sheath requirement
- Total quantity, drum length and destination
Frequently Asked Questions
Can ADSS span be selected only from pole distance?
No. Pole distance is only one input. The final ADSS design must also consider wind load, ice load, cable weight, sag limits, installation tension, terrain, clearance, attachment hardware and the required safety factors.
Does a longer ADSS span require more aramid yarn?
Longer spans normally require higher tensile performance, which may involve a different aramid yarn configuration and cable construction. The final design must be calculated against the complete route and environmental conditions.
What information is required for an ADSS span quotation?
Provide pole-to-pole distance, longest span, average span, wind speed, ice loading, route elevation, temperature range, required sag or clearance, fiber count, sheath requirement, installation location and project standard.
Is the same ADSS cable suitable for every span on a route?
Not necessarily. Routes may contain ruling spans, unusually long crossings, high wind sections or different pole strengths. The cable and hardware should be reviewed against the most demanding section and the overall route design.
How do PE and AT sheath affect span selection?
PE and AT sheath selection is mainly related to the electrical environment and tracking risk. Span capability is primarily controlled by the complete mechanical design, including tensile strength, aramid yarn, cable weight, sag and environmental loads.
Can ADSS span be confirmed without sag and tension calculations?
A preliminary selection may be discussed from route data, but final approval should use the applicable sag, tension, clearance, pole-loading and safety calculations for the project.