In overhead line procurement, the most expensive items receive the most attention. Yet installation is often delayed by small mechanical interfaces: a crossarm that does not fit the pole, a clamp outside the conductor diameter range, a missing ball-and-socket fitting or bolts that are too short for the mounting plate.
A Burundi 30kV distribution project showed why steel poles, crossarms, insulator strings and line fittings should be reviewed as one pole-top assembly rather than separate catalog items.
Not every pole carries the same load. The pole schedule should identify whether each structure is used as:
The required pole strength, crossarm reinforcement, insulator arrangement and foundation can change with the function.
In the project package, 16-meter galvanized steel poles were specified with strength classes expressed in daN. Before fabrication, the supplier should confirm what the stated load represents, the load application point, wind conditions, conductor tension, safety factor and foundation arrangement.
A tapered polygonal steel pole is different from a concrete or timber pole. Its diameter changes with height, and the flat faces affect how bands and mounting plates sit against the shaft.
The mounting package may include:
These accessories should be designed from the final pole drawing. Asking a factory to “include clamps” without giving the mounting height and local pole dimensions invites a mismatch.
The tangent crossarm reference for the Burundi line used a 2,100mm phase spacing and hot-dip galvanized angle-steel members. The documented reference sizes included:
These dimensions are useful design inputs, but they do not automatically define every crossarm in the project. Angle and terminal crossarms must carry higher longitudinal forces and should be checked against the conductor tension, deviation angle, insulator arrangement and pole strength.
The final crossarm drawing should show:
One recurring source of confusion is treating every pole-top clamp as a main-conductor fitting.
For an ACSR phase conductor, a tangent support assembly typically includes a suspension insulator string, suspension clamp and connection hardware. A dead-end assembly uses a tension insulator string and dead-end clamp to carry conductor tension.
A guard wire uses a different support and anchoring system. In the Burundi project documents, an M16 × 400 eye rod and anchor clamp belonged to the guard-wire assembly, not the ACSR phase-conductor suspension set.
This distinction affects both safety and ordering accuracy.
A typical tangent-pole phase-conductor set may include:
The exact configuration depends on the project standard and drawing.
A typical tension set may include:
For one project reference, the tension insulator string used three disc insulator units and a complete set of galvanized connecting fittings. That configuration should be treated as drawing-specific, not copied to every 30kV network.
The notation ACSR 35/6 or ACSR 95/15 describes conductor construction, but the fitting manufacturer still needs the actual conductor standard and outside diameter.
Two conductors with a similar nominal cross-sectional area may have different strand counts or diameters. A suspension clamp, dead-end clamp, PG clamp or compression sleeve must match the real conductor.
Send the following with the RFQ:
For outdoor steelwork, specify the galvanizing standard, minimum coating requirement and treatment of drilled or cut surfaces. Bolts, nuts, washers, crossarms, braces and mounting plates should be included in the corrosion review—not only the main pole.
Packing also matters. Galvanized surfaces can be damaged by unprotected metal-to-metal contact during container transport. Crossarms and brackets should be separated, secured and marked by structure type.
A pre-packing trial assembly is one of the most effective quality checks for a mixed pole-line package. It can confirm:
Photographs of the assembled set also help the site team understand how the parts relate to each other.
Younxin supports complete pole-line hardware packages based on BOQs, drawings and conductor data. Send your pole schedule and structure drawings for a coordinated quotation.
Not automatically. Angle and dead-end poles carry different mechanical loads and often need reinforced structures and different attachment points.
It depends on the drawing, but in this project the M16 × 400 eye rod was part of the guard-wire support and anchoring system, not the main ACSR suspension assembly.
Only when required by the project and approved safety arrangement. Their position, projection, anti-climb provisions and fall-protection requirements should be confirmed before fabrication.