Quick answer: Build the BOM by structure type and assembly, not as one undifferentiated hardware list. Straight, angle, dead-end and terminal poles impose different mechanical duties and need different insulator strings, clamps, links and attachment hardware.
Information required before selection
The pole schedule and approved structure drawings are the two most important inputs.
- System voltage, circuit arrangement and conductor configuration
- Pole type, height, rated load and top geometry
- Route profile with straight, angle, dead-end and terminal quantities
- Crossarm spacing, phase clearance and insulator arrangement
- Conductor, earth wire/OPGW and communication cable requirements
- Grounding, signage, anti-climbing, bird protection and spare requirements
Technical selection framework
| Review area | What the buyer should confirm | Why it changes the supply |
|---|---|---|
| Straight structure | Suspension strings, suspension clamps and lighter longitudinal duty. | It supports vertical/transverse loads but normally does not terminate full conductor tension. |
| Angle structure | Confirm line deviation and whether suspension or tension strings are required. | The permissible angle directly changes mechanical duty. |
| Dead-end structure | Use tension strings, dead-end fittings, jumper hardware and stronger attachment. | It carries longitudinal conductor load and often needs duplicated assemblies. |
| Pole attachment | Match crossarm, clamp, U-bolt, through-bolt and pole geometry. | A correct line fitting is unusable if the pole interface is wrong. |
| Grounding | Include down leads, clamps, electrodes, bonding and corrosion protection. | Grounding components are frequently omitted from the main line-hardware list. |
Recommended review sequence
- Assign a code to every structure type.
- Create one exploded assembly for each code.
- Multiply assembly quantities by the pole schedule.
- Separate common fasteners and structure-specific hardware.
- Add installation losses, recommended spares and packaging by structure code.
Common RFQ mistakes
- Applying the straight-pole assembly to angle or dead-end positions.
- Listing clamps without mating links, pins, bolts or insulators.
- Ignoring pole diameter/taper when selecting band clamps.
- Packing all small fittings together without pole or structure labels.
What a quotation package should contain
A useful supplier submission includes a structure-by-structure BOM, assembly drawings, component descriptions, materials and coating, mechanical ratings, fastener schedule, packing map and a list of clarification points.
Need equipment matched to your project?
Project-based example
In a 30kV overhead-line package, separating straight and tension structures clarified the required U70-type insulator strings, suspension/tension clamps, links, crossarms and pole attachments. The same method can be applied even when the customer provides only a partial BOQ.
Standards note: Use the project drawings and structural design basis as the governing documents. IEC, ANSI or utility component standards do not replace the need to verify the complete assembly.
