How do you work this out from the voltage or fuse size using a formally?
It defends on the wattage voltage of the appliances you are going to connect. For example you have flat iron of 2000 watts you will plug it to 120 volts. Then your ampere rating will be 16.6 ampere. Each wire manufacturer have their own table for ampacities which means ampere that certain size of wire can safely carry based on the ambient temperature. They consider also the type of insulation being used. If you compare the ampacity of 2 types of wires of same size with different insulation like silicon or polyvenyl chloryde insulation, then you will find a difference. You may wish to check also the standard table from National Electrical Code as a helpful reference. For fuse selection as per my sample, just multiply the load ampere to 125 % 16.6 amps. X 1.25 20.75 amps.say 25 amps. since 20.75 amps.is not commercially available.
ALL appliance come WITH a cable and wire attached, all you do is plug it in!
Brown wire Positive Blue wire Negative Green/yellow wire Earth
