Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning, an existing oven, a new double oven, the electric circuit, and the protection required, is answered by SELECT:

Do we have to change the existing MCB to an RCBO, or can the circuit be left as it is, with only the outlet needing to be changed?
Answer: BS 7671: 2008 applies to any new circuitry installed. Therefore there is no requirement to upgrade the circuit protection to include an RCD, provided that the existing circuit conditions are satisfactory in terms of being able to achieve automatic disconnection in the required disconnection time.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link:
www.voltimum.co.uk/consult.php?universe=consult.index.questions