IN Brief:
- Unicrimp has added 16mm² and 35mm² single bootlace ferrules.
- The components provide controlled termination for fine or multi-stranded conductors.
- Correct conductor preparation, tooling, and terminal compatibility remain essential.
Unicrimp has expanded its bootlace ferrule range with new 16mm² and 35mm² sizes for the termination of stranded electrical conductors.
The ferrules are available with colour-coded insulating sleeves and are intended for use with appropriately sized tri-rated and other compatible stranded cables. The 35mm² version is supplied in packs of 50.
A bootlace ferrule encloses the prepared end of a stranded conductor before insertion into a terminal. Crimping compresses the strands within the metallic sleeve, creating a defined end that is less likely to splay during installation.
The component can be useful where fine strands might otherwise separate beneath a clamp, enter the wrong part of a terminal, or remain exposed outside the enclosure. Ferrules can also make identification and assembly more consistent in control panels, machinery, and industrial equipment.
Correct selection begins with conductor cross-sectional area and construction. A ferrule that is too small may not accept all strands, while an oversized component may not compress correctly or fit the intended terminal.
Insulation thickness, strip length, terminal depth, and available space within the device must also be considered. A ferrule may match the nominal conductor size yet remain unsuitable for a particular terminal geometry.
The crimping tool and die profile must correspond with the ferrule size and the terminal into which it will be inserted. Square, trapezoidal, and hexagonal profiles produce different finished shapes, and not every terminal is designed around the same geometry.
Conductor preparation should avoid nicking or cutting strands. The stripped length needs to fill the metallic sleeve without leaving excessive bare conductor exposed beyond the insulating collar.
Strands should not be twisted so tightly that they prevent the ferrule from seating or alter the intended compression. Where conductors are contaminated, damaged, or oxidised, they should be remade rather than concealed within the ferrule.
After crimping, the termination should be inspected and subjected to the applicable quality checks. The conductor should remain secure, the sleeve should be fully formed, and the insulating collar should not obstruct insertion.
Ferrules do not remove the need to follow the equipment manufacturer’s instructions. Some terminals are approved specifically for ferruled conductors, while others accept either prepared or unprepared stranded cable or impose limits on ferrule length and shape.
Terminal torque also remains critical. A ferrule can improve strand control, but an incorrectly tightened clamp may still produce excessive resistance, overheating, mechanical damage, or progressive loosening.
Torque values should be taken from the equipment documentation and applied using suitable calibrated tools where required. Where spring-clamp terminals are used, the conductor and ferrule must remain compatible with the clamping mechanism and insertion depth.
Larger conductors increase the consequences of poor preparation. A 35mm² termination may carry substantial current, and resistance at the joint can generate significant heat under sustained load.
Enclosure temperature, conductor grouping, protective-device settings, terminal ratings, and load profile all influence operating conditions. A sound crimp cannot compensate for a terminal that is undersized, poorly ventilated, or operated beyond its rating.
Inspection and testing should therefore consider the complete connection rather than the ferrule alone. Thermal imaging under load, visual inspection, torque verification where permitted, and checks for discolouration or insulation damage can identify deterioration during maintenance.
The new products join a wider group of components and tools intended to improve control during installation. A contact-voltage tester with a pre-isolation warning function addresses a different stage of the same process, where suitable equipment supports a defined safe-working procedure.
Colour coding can assist identification, although several ferrule colour systems are used internationally. Sleeve colour should not be treated as proof of conductor size without checking the product specification or marking.
Panel builders may benefit from standardising ferrules, tools, strip lengths, crimp profiles, and inspection criteria across production. Consistent methods reduce variation between operators and make quality problems easier to trace.
Storage and handling also affect installation quality. Ferrules should be kept clean and separated by size, while tools require periodic inspection for wear, contamination, or damage.
A worn die can produce incomplete or inconsistent compression even when the correct component has been selected. Sample pull testing or other process checks may be appropriate where terminations are produced in volume.
The additional sizes extend Unicrimp’s range into larger conductors used in switchboards, control panels, machinery, distribution equipment, and industrial installations. Reliable performance will depend on treating the ferrule, conductor, crimping tool, terminal, and tightening method as a complete termination system.