Step 1 Determine the operating voltage of the power source.
Step 2
Determine the watts required by the circuit.
Step 3
Use a calculator to divide the number of watts by the voltage. In the case of a 230-volt circuit, using 1200 watts, the calculation would be: 1200 / 230 =5.2 amps. For a household circuit, a 8-amp fuse should be used in this circuit. A 5-amp fuse would "blow-out" consistently before the necessary power was delivered. A 10-amp fuse could overload wiring designed for a load of 1200 watts on a 230-volt circuit.
| Fuse wire rating (A) | Cu Wire diameter (mm) |
|---|---|
| 3 | 0.15 |
| 5 | 0.20 home |
| 10 | 0.35 |
| 15 | 0.50 |
| 20 | 0.60 |
| 25 | 0.75 |
| 30 | 0.85 |
| 45 | 1.25 |
| 60 | 1.53 |
| 80 | 1.8 |
| 100 | 2.0 |
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