Discuss Help with Oven Circuit. in the UK Electrical Forum area at ElectriciansForums.net
You are wrong.
MCB size is based purely and simply on cable size and installation method.
Sorry to be so arrogant. (Also cant spell)
See my comments in your quote above.The exact technical data according to the manual, Voltage 220-240V 50Hz, Total Electric Consumption 2.3kW, Fuse Protection min. 13A, Cable Type/cross Section H05VV-FG 3 x 1.5 mm2 or equivalent, Cable Length 2m. Also states to a double pole control unit with a minimum contact clearance of 3mm in all poles and further stated that Additional protection by a residual current circuit breaker is recommended.
When the manufacturers manual states 1.5mm2 cable, does that mean 1.5mm2 from the consumer unit as most existing cooker circuits are surely going to be wired in 6mm2 (as mine is) or 10mm2. This is specifying the cable from the fixed wiring to the cooker, the one specified is a 3 core flex. Run from the CU would cause problems with the 2m limit, they are trying to ensure that the cable will not over heat.
Should it be wired on the rcd protected side of the consumer? Since the manufacturers recommend it then it should be RCD protected, there may be other requirements in the wiring regulations that mean an RCD must be present, but this would get beyond a simple cooker replacement and start to involve the requirements of the Building regulations, testing and certification of the work and notifying building control as well.
Anyway i couldn't get the 6mm2 in the cooker terminals so i rewired from the cooker switch in 2.5mm2, so the current circuit is 32a breaker (not on the rcd protected side), 6mm2 T+E to double pole cooker switch (not plug socket type) then 2.5mm2 from cooker switch to cooker terminals.
Could someone clarify if my current circuit is ok and if not what would be the ideal circuit given the specifications i have given. An ideal circuit would be a 2.5mm2 twin and earth cable run direct from a 16A RCBO in the CU to a double pole switch (whether fused at 13A or not) and from the double pole switch to the cooker in HO5VV-F flex at either 1.5mm or 2.5mm.
I am sorry to say this but the changes you now mention move into the realms of full electrical installation and modifying circuits / cables at both the CU and the Kitchen and this is where further risks come in, the circuit should be designed safely and the requirements of Part P of the building regulations must be met.
The initial query has now moved beyond the point where I feel comfortable supplying any further technical information.
Good luck with the renovation, make sure you are doing this safely and legally, I will now bow out.
Personaly i'd keep the existing cooker circuit as it is and add a 13a switch fused connection unit inbetween the outgoing side of the cooker switch and the oven.....only my personal preference though. The 32a Mcb will need to be changed for a rcbo or preferabley move it across onto the rcd side of the consumer unit.
is the advice on the instructions saying 3 1.5mm cables designed for the european countries im sure read it somewhere
Many thanks, i appreciate all the help very much considering its my first time on the forum, in answer to the above am i part p registered the answer is no to be honest, i'm a fully qualified plumber with a general understanding of electrics in domestic dwellings and have just started studying part p with the intention of being competent in the near future, however my mate is a fully qualified electrician who works for the local council and whilst i usually go to him with any queries and small jobs that he normally does for me he is currently away on holiday hence my coming to this forum.
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