## Common ground
All options are electric conductors used to transmit electrical current, categorized by voltage rating and presence of connectors.
## Options at a glance
**8544.20 – Co-axial cable**
- **Defining trait:** Has a central conductor surrounded by an insulating layer and a shielded outer conductor (distinctive layered structure).
- **Typical examples:** TV antenna cables, internet coaxial cables.
- **Best fit when:** The product is specifically a co-axial design for signal transmission.
**8544.42 – Conductors with connectors (≤1,000 V)**
- **Defining trait:** Comes pre-fitted with connectors (e.g., plugs, jacks) for easy connection.
- **Typical examples:** Power cords with plugs, USB cables with ends.
- **Best fit when:** The conductor is sold ready-to-use with attached connectors.
**8544.49 – Conductors without connectors (≤1,000 V)**
- **Defining trait:** No connectors; intended for custom installation or integration.
- **Typical examples:** Bare wires, insulated cables for wiring in walls or devices.
- **Best fit when:** The product is sold as a length of wire without pre-attached fittings.
**8544.60 – Other conductors (>1,000 V)**
- **Defining trait:** Designed for high-voltage applications (over 1,000 volts), typically used in power transmission.
- **Typical examples:** High-voltage cables for substations or overhead lines.
- **Best fit when:** The product is rated for voltages exceeding 1,000 V.
## Key differences
| Feature | 8544.20 | 8544.42 | 8544.49 | 8544.60 |
|-----------------------|---------------|---------------|---------------|---------------|
| Voltage rating | Not specified | ≤1,000 V | ≤1,000 V | >1,000 V |
| Connectors included | No | Yes | No | No |
| Structure | Co-axial | Standard | Standard | Standard |
## How to choose
- Is it a co-axial cable (central wire + shield)? → 8544.20
- Does it have connectors attached? → 8544.42
- Is it without connectors and ≤1,000 V? → 8544.49
- Is the voltage over 1,000 V? → 8544.60
## Overlaps & pitfalls
- A co-axial cable with connectors could fit both 8544.20 and 8544.42. In such cases, prioritize **connectors** (8544.42) over structure.
- High-voltage conductors without connectors belong to 8544.60 regardless of other features.
- If voltage exceeds 1,000 V, it cannot be in 8544.42 or 8544.49.
- “Other” in 8544.60 includes non-co-axial high-voltage conductors; do not assume all are co-axial