What type of cable you need depends on the application - what you are going to use the cable for. Here's some information to help you choose the right cable. The capacity of a cable to 'carry' electricity depends on the cross-sectional area of the conductors - the copper cores which conduct electricity. Cross-sectional area is measured in mm². Cable which is thicker - has a larger diameter core - can 'carry' more electricity. Where the core of the cable is round, the cross-sectional area can, of course, be calculated from the diameter or radius using π (area = π x r²).
Understanding cable size - which electric cable for lights and other uses
Although the cross-sectional area of a cable's conductors determine the capacity to conduct electricity, cable is commonly 'rated' by reference to current or power rather than conductor size. Understanding these ratings involves three linked concepts:
- current - the flow of electrons in the cable and measured in Amps
- voltage - the electrical pressure applied to the cable and measured in Volts
- power - the product of current and voltage (Amps x Volts)
Cables which have conductors with a cross-sectional area of 0.75mm² are rated at 6 Amps or 1,380 Watts (6 Amps x 230 Volts is 1,380 Watts). The table shows the common cable sizes and ratings in Amps and Watts.
Conductor Size |
Current rating (Amps) |
Power rating (Watts) |
0.5 mm² |
3 Amp |
690 Watt |
0.75 mm² |
6 Amp |
1,380 Watt |
1.0 mm² |
10 Amp |
2,300 Watt |
1.25mm² |
13 Amp |
2,990 Watt |
1.5mm² |
15 Amp |
3,450 Watt |
Appliances |
Likely rating - Amps |
Likely rating - Watts |
Filament Light Bulbs |
0.1, 0.17, 0.26, 0.43 |
25, 40, 60, 100 |
Fluorescent Light Bulbs |
0.03 to 0.08 |
7 to 18 |
LED Light Bulbs |
0.01 to 0.06 |
3 to 13 |
Radio |
0.17 |
40 |
Fridges and freezers |
1.3 to 1.7 |
300 to 400 |
Microwave |
4.3 |
1,000 |
Vacuum Cleaner |
8.7 |
2,000 |
Dishwashers and Washing Machines |
9.5 |
2,200 |
- 0.5 mm² cable would be enough to power a light fitting with 10 x 4 Watt LED light bulbs, but it would not be enough if the same fitting was fitted with 10 x 100 Watt filament bulbs
- 0.75 mm² cable would be enough to to use an extension lead for a microwave, but it would not be enough to use as an extension lead for a washing machine
All the Factorylux lighting cable - round flex and twisted flex - have 0.75mm² cores and are rated at 6 Amps or 1,380 Watts. Although thinner 0.5mm² cable is sometimes used for lighting, we do not sell it. The reason is that BS EN 60598 - the applicable British and European standard for lights - requires cable to be at least 0.75mm² for light fittings. All the lights we make - wall and ceiling lights and Custom Lighting pendant lights are wired with 0.75mm² cable to comply with the British standard. And we won't sell cable which is likely to mean our customers won't comply with the standard. Although described as lighting cable, the 0.75mm² flex can be used for appliances rated below 6 Amps or 1,380 Watts. All the Factorylux power cable [sorry - now discontinued :-( . send us an email, we might have some old stock] has 1.5mm² cores and is rated up to 15 Amps. There are some useful guides and further advice on electrical safety and individual appliances here: Electrical Safety First. If in doubt, seek advice from a Registered Competent Electrician.
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