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Match each feeder cable clamp to its cable diameter: 1/2 inch, 7/8 inch, 1-1/4 inch, and 1-5/8 inch. Fit depends on the actual cable outer diameter, not the nominal size alone. Verify the manufacturer’s outer diameter spec before ordering. Fit, mechanical support, and compliance all matter.
Key Takeaways
- Always measure the cable’s actual outer diameter and compare it to the clamp’s stated range before ordering.
- Select clamps with materials and load ratings that match your site’s weather and load conditions.
- Check that the clamp meets safety and certification requirements for your project.
Feeder Cable Clamp Sizing Reference
Nominal Size vs. Outer Diameter
Nominal cable size is a label, not a measurement. The designations 1/2, 7/8, 1-1/4, and 1-5/8 inch identify a cable family. They do not define the exact diameter of the jacket that a clamp must grip. Clamp fit is set by the actual cable outer diameter. Verify the manufacturer’s outer diameter spec before ordering any feeder cable clamp.
The gap between label and reality is measurable. A standard 1/2-inch feeder cable carries a nominal size of 1/2 inch, which equals 12.7 mm. Its actual outer diameter measures 15.80 mm. A superflex 1/2-inch variant measures 13.60 mm, a smaller jacket built for a tighter bending radius.
| Cable Type | Actual Outer Diameter | Nominal Size |
|---|---|---|
| Standard 1/2″ feeder cable | 15.80 mm | 1/2 inch |
| Superflex 1/2″ feeder cable | 13.60 mm | 1/2 inch |
RF cable families such as CELLFLEX range from 1/4 inch to 1-5/8 inch and cover all four sizes in this guide. Each family contains multiple models with distinct jacket dimensions.
Reading Clamp Size Labels
Clamp labels reward careful reading. A label may state a nominal cable size, a diameter range, or both. Treat a bare nominal size as a starting point, not a guarantee. A stated range is more useful. Compare the cable’s published outer diameter against that range before purchase.
Clamps for 1/2 Inch Cable
Sizing Details and Clamp Types
The Telsto Feeder Clamp for 1/2” cable, 2 holes (Model TEL-CC-12×2) shows how a through-type design is specified. This feeder cable clamp holds two 1/2-inch cables per layer in a double-hanger configuration.
Clamps for 7/8 Inch Cable
| Component | Material | Diameter (mm) |
|---|---|---|
| Inner Conductor | Copper Clad Aluminum | 9.0 ± 0.10 |
| Jacket | Black LSZH / Black PE | 27.50 ± 0.30 |
Clamps for 1-1/4 Inch Cable
| Layer | Material | Diameter (mm) |
|---|---|---|
| Inner Conductor | Copper | 13.10 ± 0.10 |
| Jacket | LLDPE | 38.80 ± 0.30 |
Clamps for 1-5/8 Inch Cable
| Component | Diameter Specification |
|---|---|
| Outer Conductor | 46.50 ± 0.30 mm |
| Jacket | 49.60 ± 0.30 mm |
Selection Criteria
Material, Load, and Environment
Material choice sets the baseline for clamp life. Metal parts in 304 stainless steel resist rust in coastal and humid zones. Plastic saddles in modified PP or improved PP resist acid and UV exposure.
| Clamp Type / Size | Rated WLL | Environmental Condition |
|---|---|---|
| 304 stainless U-bolt (1/4″) | Up to 600 lbs | Coastal/humid zones; service life >10 years |
| Large stainless U-bolt | Up to 1,200 lbs | Heavy-duty use; verify stamped WLL |
Comparing Feeder Cable Clamp Options
| Clamp Type | Key Technical Advantages | Budget Range |
|---|---|---|
| Metallic cleats | High short-circuit rating (≥150 kA), fire-resistant | $12–$45 |
| Composite cleats | Non-conductive, lightweight, corrosion-proof | $8–$32 |
FAQ
How do I confirm the correct clamp size for my feeder cable?
Measure the cable jacket with a caliper and compare it to the clamp’s stated diameter range. A 1/2-inch cable may measure 15.80 mm or 13.60 mm, so the label alone cannot confirm fit.
Why does a 7/8 inch clamp sometimes fit loosely?
Nominal size identifies a cable family, not a jacket dimension. A typical 7/8 inch feeder cable lists a 27.50 mm jacket. Models within the family vary, so check the datasheet for the exact model.
Are stainless steel clamps suitable for coastal sites?
Yes. Metal parts in 304 stainless steel resist rust, and modified PP saddles resist acid and UV exposure. Both materials suit outdoor BTS and antenna installations in humid or coastal zones.
Post time: Oct-28-2026
