How many ovens can a standard domestic electrical supply cope with?

This all Depends on loads of items listed. cookers could be 13 amp or 30 amp if 30 amp they require 2 supplies . your hob will need 30 amp supply the rest could go on kitchen ring main. 2 x cooker supplies 30 amp 1 x hob 30 amp 1 x 32 amp ring main

So many people get this wrong because they are told how to do it – this is transcribed from the 17th edition AMD3 onsite guide that all electricians are supposed to use as guidance when carrying out work in domestic properties. H4 Cooker circuits in household and similar premises. The circuit supplies a control switch or a cooker unit complying with BS4177 (cooker isolator), which may incorporate a socket-outlet. The rating of the circuit is determined by the assessment of the current demand of the cooking appliance(s), and cooker control unit socket-outlet if any, in accordance with table A1 of Appendix A. A 30 or 32 A circuit is usually appropriate for household or similar cookers of rating up to 15 kW. A circuit of rating exceeding 15 A but not exceeding 50 A may supply two or more cooking appliances where these are installed in one room. The control switch or cooker control unit should be placed within 2 m of the appliance, but not directly above it. Where two stationary cooking appliances are installed in one room, one switch may be used to control both appliances provided neither appliance is more than 2 m from the switch. Your electrician will be able to advise on the loadings but generally one cooker supply is sufficient, and fixed loads of 3 kW shouldn’t be connected to a ring main.