Replace Ceramic Hob with Induction Hob Query [UK]

Question

Existing installation over a decade old: 
 
 Ceramic Hob 
 Fed from 32A 2 pole Isolator 
 Hob has dedicated Radial Circuit 32A MCB (note for avoidance of doubt: oven is on Separate 32A MCB radial circuit) 
 Hob Radial Circuyt has 6mm2 cable (confirmed from elec cert). 
 
 Existing hob is woking fine but considering replacing with induction hob for energy efficiency reasons. 
 So, Question; If it is replaced with an new induction hob (like for like other than change from ceramic radiant hob to induction hob): 
 1) is it mandatory for the swapout (disconnection of cable connection to old and reconnection to new) to be undertaken by a qualified electrician? 
 2) Will replacement of ceramic hob with induction hob mean installation of RCD protection of the circuit will be required (eg change from MCB to RCBO [obviously] by qualified electrician)? 
 Thanks, 
 Paul

Simon Barker · Accepted Answer

1. No, it only has to be done by someone who is competent to do it. 
 2. Depends on what you mean by "required". It's probably required by the latest edition of BS7671, unless the circuit is one that doesn't need an RCD by design. It may be required by law, but if it is, then it was probably illegal even before the hob was swapped.

Chris Pearson · Answer

I see no reason why the circuit has to be brought up to the current BS 7671 although it is highly desirable. The manufacturer's instructions may well specify that a Type A RCD is required, in which case an installer might not be willing to connect. 
 Would I swap my own hob without upgrading? Yes, if we didn't use gas.

AJJewsbury · Answer

an altered such circuit would also require an RCD wheb altered 
 
 Not necessarily - new work should comply with current regs, but there's no stipulation that an entire circuit needs to be brought up to date when working on part of it. 
 - Andy.

Replace Ceramic Hob with Induction Hob Query [UK]

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