Cable Size Calculator — Partisan Comms Group
Cable Size Calculator
Determine Recommended DC Power Cable Sizes for Amateur Radio Equipment
Reliable DC power wiring is critical for amateur radio stations. Undersized cable can cause excessive voltage drop, reduced transmitter performance, radio shutdowns, and overheating.
This calculator estimates the minimum recommended cable size based on voltage at the power source, current draw of the radio or device, and one-way cable length. The calculator assumes a two-conductor DC circuit where current travels to the device and returns to the power source.
Safety Notice
Improperly sized wiring can overheat and create a fire hazard. Always follow manufacturer recommendations and electrical safety practices when designing or modifying power systems.
Calculate Cable Size
Typical Equipment Current Draw
| Equipment Type | Typical Receive | Typical Transmit |
|---|---|---|
| Handheld Radio | <1A | 1–3A |
| Mobile VHF/UHF Radio | 0.5–1A | 10–15A |
| 50W HF Radio | 1–2A | 10–12A |
| 100W HF Radio | 1–2A | 20–25A |
| Small Portable Power Station | Varies | Varies |
Always consult the manufacturer's specifications for actual current draw.
Power Wiring Best Practices
- —Use stranded copper wire for flexibility and durability.
- —Keep power cable runs as short as practical.
- —Install fuses close to the power source.
- —Use properly rated connectors and terminals.
- —Verify polarity before connecting equipment.
- —Larger wire sizes reduce voltage drop and improve system efficiency.
- —Inspect wiring periodically for damage, corrosion, or loose connections.