## Common ground
All options refer to conductive metallic wires used in overhead power lines, specifically ACSR (Aluminum Conductor Steel Reinforced) core strands.
## Options at a glance
**7312.10 – Made of iron or steel**
- **Defining trait:** Core wire is made from ferrous metal (iron or steel), providing mechanical strength.
- **Typical examples:** Steel core in ACSR cables, galvanized steel strands.
- **Best fit when:** The primary function is structural reinforcement; the wire is not the main conductor.
**7413.00 – Made of copper**
- **Defining trait:** Wire is made from copper, a highly conductive metal, but less common in ACSR cores due to cost and weight.
- **Typical examples:** Copper core in specialized high-conductivity cables (rare in standard ACSR).
- **Best fit when:** High electrical conductivity is prioritized over strength or cost; not typical for standard ACSR.
**7614 – Made of aluminium**
- **Defining trait:** Wire is made from aluminum, lightweight and conductive, commonly used as the outer conductor in ACSR.
- **Typical examples:** Aluminum strands in ACSR cables, overhead transmission lines.
- **Best fit when:** The wire is part of the current-carrying outer layer; not the core.
## Key differences
| Feature | 7312.10 (Steel) | 7413.00 (Copper) | 7614 (Aluminum) |
|------------------|-----------------|------------------|-----------------|
| Material | Iron/steel | Copper | Aluminum |
| Primary role | Strength | Conductivity | Conduction |
| Common use in ACSR | Core | Rare | Outer layer |
## How to choose
- Is the wire primarily for mechanical strength? → 7312.10
- Is it made of copper and used in a high-conductivity cable? → 7413.00
- Is it aluminum and part of the outer current-carrying layer? → 7614
## Overlaps & pitfalls
- **Overlap:** ACSR cables use both steel (core) and aluminum (outer), so a product could be misclassified if not clearly identified as core or conductor.
- **Pitfall:** "Made of" refers to the material, but context matters—steel is used in cores, aluminum in conductors. If the wire is the central reinforcing strand, it’s 7312.10 regardless of outer layer.
- **Priority:** Use the **main function** (structural vs. conductive) and **material composition** to decide