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Choosing the correct size flex


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Choosing the correct size flex

It is important to choose the correct size flex when connecting to the mains. The wire has to be the correct size so that it can cope with the power demands of the device. The size stated for flex is given in mm2 and this measurement is actually the cross sectional area of the wire inside. The larger that area the higher the current it can carry.

If a flex is used which is too small for the amount of current passing through, it becomes dangerous. This results in the wire overheating and causing a serious safety risk. The table below gives typical values of flex size available plus corresponding current rating and maximum power ratings.

Conductor Size
Maximum power (Watts)
0.5 mm2
3 amps
Up to 720 Watts
0.75 mm2
6 amps
Up to 1440 Watts
1.0 mm2
10 amps
Up to 2400 Watts
1.25 mm2
13 amps
Up to 3120 Watts
1.5 mm2
15 amps
Up to 3600 Watts

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