| Property | FRP crossarm | Wood crossarm | Steel crossarm |
|---|---|---|---|
| Rot and insects | None | Decay, insects, woodpeckers | None (but corrodes) |
| Insulation | High, consistent when clean | Depends on moisture | None (needs insulators and grounding) |
| Weight | Light | Medium to heavy (treated) | Heavy |
| Strength variation | Consistent (manufactured) | Natural variation | Consistent |
| Fire | Needs flame-retardant resin for fire zones | Burns | Does not burn |
| Creep and deflection | Check under sustained load | Moderate | Low |
| Cost | Higher up front | Lower | Medium |
What a utility needs to specify
- Voltage class, insulation level and the required creepage / dry-arc distance.
- Vertical, transverse and longitudinal design loads and the safety factors of the utility’s code.
- Hole pattern, brace attachment and end details.
- Environment: coastal, polluted, high UV, fire exposure.
- Compliance with the utility’s approved-product list and any applicable standard.
Because the arm is a long beam in bending, check deflection and creep: see fiberglass vs steel beams for the method and resin choice for UV and fire.
Frequently asked questions
Do FRP crossarms need grounding?
They do not conduct, but the design of the line and the utility’s rules decide grounding and shielding; follow them.
Moving from wood to FRP: practical points
- Hardware: check bolt sizes, hole patterns and brace fittings so an FRP arm drops into the existing assembly.
- Handling: use the lifting points and slings the maker specifies; do not hammer on cut edges or notches.
- Cutting and drilling: carbide tools; seal cut edges with resin to keep moisture out of the fibres.
- Inspection: look for cracks, surface chalking, loose bolts and tracking marks on the insulating surface; clean contamination in polluted or coastal areas.
- Records: keep the maker’s batch and test data with the asset record.
Frequently asked questions
How long does an FRP crossarm last?
It depends on UV protection, loading and environment. Ask the maker for weathering and load test data, and treat any life figure without data as a claim to check.
Can FRP crossarms be repaired?
Small surface damage can be sealed, but a cracked load-bearing arm should be replaced.
Send us your requirement
Guangdong Haikuo Composite Materials Co., Ltd. (Huizhou, Guangdong) designs pultrusion moulds in-house and produces custom FRP profiles. Send a drawing, a sample or just the application and the environment, and we will tell you what is feasible.
Email: helena@frphk.cn | Phone: +86 189 5198 8522