Custom Cable Assemblies HS Code Guide | Hooha Harness
Hooha’s cable hs code article explains the wire harness context, but a custom cable assembly should not be forced into one fixed HS code without checking the product facts. The safer method is to start with HS heading 8544 for insulated conductors, then narrow the direction by construction, voltage, connectors, and end use under the tariff schedule used by the importing country.
Start with product facts, not a memorized code
Before choosing an HS or HTS number, prepare a short classification file for each SKU. It should describe the cable in the condition imported: conductor material, insulation, shielding, connector type, voltage rating, whether it is coaxial or optical fiber, whether it is a wiring set for vehicles, aircraft, or ships, and whether active electronics are included.
What official tariff sources say about cable assemblies
The WCO Harmonized System provides the international six-digit framework, while each country can extend the code for duty and statistical purposes. U.S. government guidance explains that the first six digits are the HS code, while U.S. imports use a 10-digit HTS number. The current U.S. HTS data for heading 8544 covers insulated wire, cable and other insulated electric conductors, whether or not fitted with connectors, plus specified optical fiber cables.
| Screening order | HS/HTS direction to check | What to verify before using it |
|---|---|---|
| Winding wire | 8544.11 / 8544.19 | Whether the product is winding wire, and whether the conductor is copper or another material. |
| Coaxial cable | 8544.20 | Whether the construction is coaxial, rather than a general multi-core assembly. |
| Ignition wiring sets and other wiring sets of a kind used in vehicles, aircraft, or ships | 8544.30 | Whether the assembly is genuinely a wiring set of that kind; do not apply this only because the product has multiple wires. |
| Optical fiber cables | 8544.70 | Whether the cable is an optical fiber cable made up of individually sheathed fibers, with or without electric conductors or connectors. |
| Other electric conductors not exceeding 1,000 V, fitted with connectors | 8544.42 | Whether the assembly is an insulated electric conductor, within the voltage threshold, and imported with connectors fitted. |
| Other electric conductors not exceeding 1,000 V, not fitted with connectors | 8544.49 | Whether it is unterminated or otherwise not fitted with connectors at import. |
| Other electric conductors for a voltage exceeding 1,000 V | 8544.60 | Whether the voltage rating exceeds 1,000 V; connector status and national subdivisions still need checking. |
This table is only a screening sequence. A six-digit HS direction is not the final country-specific code. The final declaration may require a 10-digit national tariff number, and it can depend on legal notes, General Rules of Interpretation, customs rulings, origin, trade programs, and the exact product facts at entry.
Two teaching examples
Example 1: a 24 V industrial sensor lead with PVC insulation and molded M12 connectors at both ends may point toward the “other electric conductors not exceeding 1,000 V, fitted with connectors” path, but the importer still needs the exact construction, use, origin, and national tariff line before filing entry documents.
Example 2: a pre-assembled wiring set designed for a specific vehicle platform may need review under the vehicle/aircraft/ship wiring set path, but the same conclusion should not be copied to a general control-cabinet cable assembly or to bulk cable on a reel.
Documents to collect before shipping
- Bill of materials showing conductors, insulation, shielding, terminals, connectors, sleeves, and any electronic components.
- Voltage rating, current rating, cable standard, connector specification, and whether the assembly is fitted with connectors at import.
- End-use description: vehicle, aircraft, ship, industrial control cabinet, appliance, telecommunications, medical equipment, or another application.
- Product photos or drawings that show the finished assembly and connector ends.
- Country of origin, manufacturing steps, invoice description, and customer part number.
- Any previous customs ruling or broker classification used for the same SKU, with the facts that supported it.
When to request a ruling
If the duty difference is material, the same assembly can be interpreted in more than one way, or the customer requires a defensible import record, request advice from a licensed customs broker or the relevant customs authority. For U.S. imports, CBP explains that electronic ruling requests can be submitted for prospective shipments and should include a complete description, component materials, principal use, technical designation, literature, photos, and any other information needed to determine classification.
Practical notes for buyers of custom cable assemblies
- Do not copy a supplier’s code blindly. A supplier’s invoice code is a starting point, not a guarantee that customs will accept it for your import country.
- Separate automotive harnesses from general assemblies. A vehicle wiring set and a low-voltage industrial cable assembly with connectors may follow different subheadings.
- Keep product descriptions precise. “Cable assembly” is too broad; describe voltage, connectors, application, and construction.
- Record the rationale. Keep the tariff line, source consulted, product facts, and reviewer/date so the decision can be checked later.
- Review codes when designs change. Adding connectors, shielding, active electronics, or changing the voltage rating can change the classification analysis.
Official sources to verify
- International Trade Administration: Harmonized System (HS) Codes — explains the HS framework, six-digit HS codes, U.S. Schedule B and HTS extensions, and CROSS use.
- USITC HTS search data for 8544 — current U.S. tariff schedule entries for insulated conductors, winding wire, coaxial cable, vehicle wiring sets, fitted connectors, high-voltage conductors, and optical fiber cables.
- CBP Requirements for Electronic Ruling Requests — lists information needed for a binding classification ruling request.
- WCO Trade Tools Harmonized System — official WCO access point for HS nomenclature and interpretive materials, with some features requiring login.