I'm putting in a new kitchen and am running cables for a kitchen ring main. However will my oven (A Siemens HB56M550B) be ok on a 13A ring main? If not, will I have to run a separate oven cable from the consumer unit?
Hi and welcome to the forum.
To summarise what has been said in the other posts to make it easy to read.
The Oven will not be able to run on a 13A Socket as being a double oven it will require more power and thus will require a separate circuit from your Consumer Unit.
However, under Part P of the building regulations that you will find lots of details from the link posted earlier, the work you are looking to undertake is covered. This means that you will either have to notify your local building authority at least 48 hours before commencing any work, submitting full details of what you intend to do, along with paying the relevant fee. Assuming that you complete the work to a satisfactory standard, they will issue you a certificate. The only other alternative is to retain the services of an electrician who is registered under one of the competent person schemes. They are able to certify their own work and issue you with a certificate. Failure to do one of the above can make it very difficult to sell your property as electricians will not sign off someone else's work, as with electrics, so much of the installation is hidden in walls and under floorboards.
It is I believe, the opinion of the very experienced contributors to this forum that the questions that you asked suggests a lack of experience of electrics and that the job would be beyond your DIY ability level. Remember electricity kills and a bad installation could at worst kill you and your entire family. It is very important that the job is done properly to the required standard. The recommendation is that you contact some local electricians and obtain quotes for the work to be done. If you are trying to keep costs down, you might be able to negotiate with the electricians to do the donkey work yourself, i.e. Chasing out walls, fitting back boxes, lifting floorboards etc, possibly even pulling the cable although not all will agree to this as they want to do all the cable work themselves to certify it.
That said. If you really do want to do the work yourself, you can. If you want advice from here, I would recommend that you take it slowly, plan carefully, ask questions. Be very sure of what you are doing, the risks and process you need to go through before you even contemplate picking up a screwdriver. This site is here to help DIYers like yourself, but you will have to be prepared to take it slowly to do it right and end up with a quality job.
