Uses the usual 20°C temperature coefficient: 0.00393 for copper and 0.00403 for aluminium. Handy when a cold R1+R2 needs comparing with a figure quoted at another temperature.
This corrects conductor resistance only. It is not the 0.8 factor sometimes applied to maximum Zs, and it is not a substitute for the expected-results calculator.
These tools are quick guides for a ballpark figure. They are not certified design or test software, and a result on this page is not a design, a certificate, or a substitute for the current edition of BS 7671. Check the working and cross-reference it before you apply it to a real installation. Thanet Electrical Ltd does not accept liability for loss or cost arising from reliance on these figures, except where the law does not allow that liability to be excluded, including death or personal injury caused by negligence.
All tools