Chao Lao Beach Posted January 15, 2015 Share Posted January 15, 2015 I was looking at some loads recently and at Crossys site and the FAQ above. The following shows the cables sizes for the appropriate circuit breaker;1.5 mm2 cable - 15 amp maximum circuit breaker.2.5 mm2 cable - 20 amp maximum circuit breaker.4 mm2 cable - 25 amp maximum circuit breaker.6 mm2 cable - 32 amp maximum circuit breaker.10 mm2 cable - 40 amp maximum circuit breaker. thanks to Crossy site click here When I add up gadgets and stuff on partcular circuits, it is much easier to do that in watts, how to convert watts at 220V to amps ? Link to comment Share on other sites More sharing options...
Crossy Posted January 15, 2015 Share Posted January 15, 2015 For our purposes:- Watts = Volts x Amps Transposing for Amps. Amps = Watts / Volts = Watts / 220 There are also rules of thumb to determine 'diversity' as it's unlikely that all the kit on a circuit will be operating together. So you could actually have more load than the circuit can handle without opening the breaker (think kettle, toaster, grill, microwave). So, for example, a 3.5kW shower = 3500 Watts / 220 = 15.9 Amps, so 2.5mm2 cable and a 20A breaker would be adequate. For these approximations we can discount Power Factor. Link to comment Share on other sites More sharing options...
Chao Lao Beach Posted January 15, 2015 Author Share Posted January 15, 2015 Thanks crossy Link to comment Share on other sites More sharing options...
sappersrest Posted January 17, 2015 Share Posted January 17, 2015 Doncaster cables one of the uks leading suppliers have a very good cable sizing calculator on there website. Link to comment Share on other sites More sharing options...
billphillips Posted January 17, 2015 Share Posted January 17, 2015 Volts multiplied by amps = watts or Watts divided by volts = amps Volts in Thailand being 220 Look at the wattage of your appliance, divide it by 220. The answer is the minimum amperage of the breaker you will need but it's better to add around 15% to cover a surge. Link to comment Share on other sites More sharing options...
Crossy Posted January 17, 2015 Share Posted January 17, 2015 Doncaster cables one of the uks leading suppliers have a very good cable sizing calculator on there website. Indeed they do, here:- http://www.doncastercables.com/technical-help/ The only negative is that it restricts the volt-drop to the UK requirements of 3% or 5% The calculator here is limited to a maximum cable of 16mm2 but you can juggle the parameters http://www.crossy.co.uk/wiring/VoltageDrop.htm Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now