Una férula para cable es un manguito metálico tubular crimpado alrededor de los hilos pelados de un conductor para preparar su extremo para su inserción en un terminal compatible. Reúne los hilos en un extremo contenido. El terminal sigue proporcionando la conexión de sujeción; el tipo, tamaño y forma acabada de la férula deben adaptarse a esa conexión.
También llamada férula de puntera, manguito de extremo de cable o férula de extremo de cordón, este componente se especifica por algo más que el color del collarín. Para entender una férula, separe su capacidad de conductor, la geometría del manguito y el uso permitido en el terminal receptor.
¿Qué hace una férula para cable?
La funda metálica rodea los hilos conductores expuestos. El crimpado forma la funda alrededor de ellos para que el extremo preparado pueda manipularse e insertarse como un único haz contenido. En una versión con collarín, la entrada de plástico rodea el extremo de entrada del cable; la parte metálica proyectada entra en el área de contacto del terminal.
El alcance público de UL 486F, Terminales de puntera desnudos y cubiertos describe los terminales de puntera como una preparación del extremo del conductor que facilita la conexión de cables multiconductor y evita que los hilos se doblen hacia atrás durante la inserción. Cubre diseños para un conductor de cobre multiconductor o dos del mismo tamaño.
Esta función es diferente de un terminal atornillado a un espárrago o de un conector que une dos extremos de cable. Un terminal de puntera prepara el extremo para otro dispositivo de conexión. UL 486F también separa los terminales de puntera de los adaptadores de clavija cubiertos por otras normas de conectores; un extremo metálico de aspecto similar no establece la intercambiabilidad.
DIN 46228-4:2020-03 identifica las fundas de extremo tubulares con fundas de plástico. Su introducción oficial explica la contención de los hilos y una inserción más fácil en el terminal. Esto apoya el propósito del componente, sin establecer que cada terminal requiera uno.
Los principales tipos de terminales de puntera para cables
La primera distinción más útil es un conductor o dos, seguido de construcción con collarín o sin collarín. El catálogo de YOCL organiza estos en las series E, EN y TE:
| Construcción | Disposición visible | Qué necesita comprobación separada |
|---|---|---|
| Férula aislada para un solo hilo, serie E | Un manguito tubular con collarín aislante | Tamaño de conductor individual, longitud del manguito y holgura del collarín |
| Casquillo para un solo hilo sin aislamiento | Manguito de metal desnudo con entrada acampanada | Tamaño del conductor, dimensiones del tubo y disposición del aislamiento del equipo |
| Casquillo para dos hilos con aislamiento TE | Un manguito común y un collar más ancho para dos conductores | El tamaño de cada conductor y la aceptación de la terminación terminada de dos hilos |
Estos son nombres de series YOCL, en lugar de un sistema de nomenclatura universal para cada proveedor. “Aislado” identifica la construcción del collar; no proporciona una clasificación de voltaje para la conexión completada. Del mismo modo, “doble” identifica la disposición prevista del conductor, en lugar de permitir la inserción de dos cables en cualquier terminal.
Cómo leer el tamaño de una virola
El área del conductor es diferente del diámetro
Una designación como 1.5 mm² se refiere al área de la sección transversal del conductor. No es el diámetro exterior del cable, el diámetro interior de la virola ni el diámetro de su collarín de plástico.
Read the ferrule’s declared conductor size alongside its drawing. The conductor determines the capacity needed inside the sleeve; the ferrule’s external dimensions affect the space needed at the terminal. Cable insulation and collar geometry add another fit question at the entry.
American Wire Gauge (AWG) is another conductor-size designation. Use the exact AWG or metric sizes declared for the chosen product and conductor. A catalogue pairing is not a reason to assume every nearby AWG/mm² size is an approved substitute.
Sleeve length is different from overall length
Ferrules of the same conductor capacity can have different sleeve lengths. On YOCL’s E-series drawing, F identifies the sleeve-length segment and L the overall length including the collar. These letter labels belong to that drawing; check the exact series before transferring their meanings.
The published E-series y TE-series tables provide a useful example:
| YOCL model | Disposición de conductores declarada | F sleeve length | L overall length |
|---|---|---|---|
| E1508 | One × 1.5 mm² | 8.0 mm | 15.0 mm |
| E1512 | One × 1.5 mm² | 12.0 mm | 19.0 mm |
| TE 1508 | Two × 1.5 mm² | 8.0 mm | 15.5 mm |
These are catalogue dimensions, not measurements of an installed connection. E1508 and E1512 accept the same declared conductor area but have different lengths. TE 1508 shares an 8 mm F dimension with E1508 while describing a different conductor arrangement. Neither area nor sleeve length alone determines terminal compatibility.
The receiving terminal’s insertion depth and preparation instructions determine which length is appropriate. Overall length cannot substitute for sleeve length when comparing the metal portion with the terminal’s contact space.
Twin notation and collar colour need their own reading
2 × 1.5 mm² means two conductors, each 1.5 mm². Their nominal areas add to 3 mm², but that arithmetic does not turn the twin ferrule into a single-wire 3 mm² model. Entry geometry, sleeve capacity, tooling and the permitted terminal arrangement remain separate requirements.
Colour is useful only within the specified catalogue coding. YOCL’s E-series lists colour options by size group. Its TE 7508 and TE 7510 models both declare 2 × 0.75 mm², yet list blue and grey collars respectively. Confirm the model and conductor designation rather than selecting a ferrule from colour alone.
What makes a ferrule compatible with a terminal?
Compatibility involves three interfaces:
- Conductor to ferrule: the conductor material, size and count must match the ferrule’s declared arrangement.
- Ferrule to crimping tool: the applicable tool and die must produce the required termination for that ferrule. Tool capacity alone does not establish the correct finished profile.
- Finished ferrule to terminal: the receiving device must permit the prepared conductor arrangement and accommodate its sleeve, crimp profile and collar.
“Screw terminal”, “spring terminal” and “push-in terminal” name connection mechanisms. They do not provide a universal answer to whether a ferrule is required, optional or unsuitable. Use the exact device’s instructions and any declared range for ferruled conductors. A ferrule that physically enters the opening has passed only a geometry check.
There is also an explicit scope boundary: UL 486F’s public scope excludes insulation-displacement connection (IDC) terminal blocks. Do not treat a prepared metal sleeve as a general replacement for the insulated wire that an IDC contact is designed to engage.
For a twin ferrule, verify acceptance of the two-conductor arrangement and its finished dimensions. A larger opening, a sufficient nominal area or a broad plastic collar cannot supply that authorization. Square and hexagonal crimp names also need to be checked against the actual ferrule, tooling and terminal documentation; neither is a universal compatibility rule.
What do standards and certification tell you?
Standard identity, product dimensions and connection approval answer different questions. DIN’s published title identifies a construction family; UL 486F’s public scope identifies its intended use and exclusions. A supplier’s reference to either standard is not, by itself, a model-specific certification record.
UL Solutions’ explanation of Component Recognition distinguishes a component’s assessment from certification of a complete end product. Recognized components have conditions of acceptability governing their use. Where certification is required, check the exact product record and applicable conditions alongside the receiving equipment’s documentation.
The YOCL dimensions above are first-party product declarations. They help interpret size fields; this article does not assert UL certification, a current rating or an approved terminal combination for those models.
Which document should you check next?
| Su pregunta | The next document to use |
|---|---|
| Which construction describes the part I need? | The single, bare or twin product-family information |
| What conductor does this model accept? | Its declared conductor size, material and count |
| What do its length and diameter fields mean? | The exact model/series drawing and dimension table |
| Which tool produces the required crimp? | The applicable ferrule and tooling instructions |
| Is the prepared end permitted in my terminal? | The exact receiving device’s wiring instructions and connection data |
| What evidence covers the intended equipment or market? | Relevant model certification records, conditions and equipment requirements |
La YOCL wire-ferrule catalogue routes these construction and dimension questions to the E, EN and TE product information. When asking for a model review, include the conductor size and count, required sleeve length and receiving terminal reference so the enquiry describes the complete interface.
Referencias
- Standards & Engagement — UL UL 486F: Bare and Covered Ferrules, Edition 3, 2024, revised August 2026. Official public scope, §§1.2, 1.6 and 1.8; function, conductor arrangement and exclusions.
- DIN Media — DIN 46228-4:2020-03: Tubular end-sleeves with plastic sleeve. Official publication identity and public introduction; the paid full standard was not consulted.
- Información del producto YOCL — Terminales de cable preaislados serie E. Construction, model dimensions, drawing and declared colour options.
- Información del producto YOCL — Terminales de cable no aislados serie EN. Bare flared-entry construction and dimension fields.
- Información del producto YOCL — Conectores dobles de cable serie TE. Two-conductor notation, model dimensions and model-specific collar colours.
- UL Soluciones — The UL Component Recognition Classification. Component conditions of acceptability and the end-product certification boundary.