Is this the norm now days

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Hi, I just had my electrician size the cables for my new kitchen supplies. They have suggested 2.5mm T&E for the oven supply.

When i questioned this (as i have only ever seen far beefier cables in ovens) they said that 2.5mm is normal now days for ovens as they are far more efficient and the larger cables (10mm) are left for the hobs only.

Is this correct before i let them lose on pulling cables?
 
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Might be a good idea to find out the kw rating for the oven before giving advice.
 
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From looking at the literature the ratings are as below;

Microwave oven 2.2kw
Steam oven 3.2kw
Main Oven 3.5kw

All are on their own supply. Spark has recommended 2.5mm T&E on 16amp breakers
 
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Sorry I didn't mention, the hob will be on a separate circuit using 10mm T&E on a 50 amp breaker.
 
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Sorry I didn't mention, the hob will be on a separate circuit using 10mm T&E on a 50 amp breaker.
Guess that is oversized then. Hobs only normally require 4mm2 cable on a 32a breaker. Look up diversity.
 
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How do you know it's oversized with out knowing the Hob rating W? Or are Hobs no bigger than 32A
 
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From looking at the literature the ratings are as below;

Microwave oven 2.2kw
Steam oven 3.2kw
Main Oven 3.5kw

All are on their own supply. Spark has recommended 2.5mm T&E on 16amp breakers
He could have recommended 1.5mm2 for a 16 a breaker.
 
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How do you know it's oversized with out knowing the Hob rating W? Or are Hobs no bigger than 32A
... I don't think you would find a hob which represented more than a 32A after diversity load - since that would be something like 83A (about 19 kW at 230V) without diversity.

Kind Regards, John
 

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