## Common ground
All options refer to electric car charging cables used for transferring electrical energy to vehicles.
## Options at a glance
**8504.40 – AC/DC or voltage conversion**
- **Defining trait:** Contains built-in electronics (e.g., rectifier, transformer, current controller) that convert or regulate electrical energy.
- **Typical examples:** Smart chargers with onboard power conversion, DC fast-charging cables with integrated converters.
- **Best fit when:** The cable actively changes AC to DC or adjusts voltage levels during charging.
**8544.42 – No energy conversion**
- **Defining trait:** Transfers electrical energy without altering its form or level; no internal power electronics.
- **Typical examples:** Simple AC charging cables (e.g., Type 1/2 cables for home charging), basic tethered cables with no control unit.
- **Best fit when:** The cable only conducts electricity from a fixed source to the car, with no conversion or regulation.
## Key differences
| Feature | 8504.40 (Conversion) | 8544.42 (No Conversion) |
|-----------------------|----------------------------|------------------------------|
| Energy conversion | Yes (AC/DC, voltage change) | No |
| Internal electronics | Yes (rectifier, transformer) | None |
| Use case | Fast charging, smart systems | Standard AC charging |
## How to choose
- Does the cable include a rectifier, transformer, or current controller? → 8504.40
- Does it only carry electricity without changing its form? → 8544.42
## Overlaps & pitfalls
A cable may appear to fit both if it has minimal control electronics but still performs basic regulation. However, the presence of *any* energy conversion (e.g., AC/DC) makes it 8504.40. If in doubt, prioritize the **main function**: if conversion is central (e.g., enabling DC fast charging), use 8504.40; if it’s just a passive conductor, use 8544.42