Electricity behaves a lot like water flowing through a pipe. If you try to force a high volume of water through a tiny pipe, pressure builds up, and the pipe can burst.
Cable insulation has a maximum operating temperature (e.g., 70°C for PVC, 90°C for XLPE, 90–250°C for special compounds). The sizing must ensure that under normal full-load current, the conductor temperature stabilizes below this limit. electrical cable sizing
Electrical codes (like the NEC in the US) exist to keep you alive. Electricity behaves a lot like water flowing through a pipe
You cannot choose a cable size based solely on the length of the run. You must calculate based on three specific factors: The sizing must ensure that under normal full-load
| Wire Gauge (AWG) | Typical Breaker Size | Common Uses | | :--- | :--- | :--- | | | 15 Amps | Lighting circuits, standard bedroom outlets. | | 12 AWG | 20 Amps | Kitchens, bathrooms, laundry rooms, outdoor outlets. | | 10 AWG | 30 Amps | Electric dryers, window air conditioners. | | 8 AWG | 40 Amps | Electric ranges, larger HVAC units. | | 6 AWG | 50-55 Amps | Hot tubs, sub-panels, EV chargers (Level 2). |