Please don't try.. Buy the correct cable, which will have three cores, Blue, Brown and a bare earth wire. - known as 'twin and earth' cable. You will need either 6mm squared or 10mm squared cable to handle the power, the installation manual will advise. You will also need green/yellow earth sleeve to insulate the earth wire correctly.
Your question worries me that you don't have the knowledge to perform electrical work safely and could be creating a potential fire hazard by using under-rated cable.
rupert, February 2019
