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We just had a range oven fitted (gas on hob with two electric ovens - total power rated at 5.3Kw) so a 32Amp mcb is in the board on the dedicated cooker circuit which was there from previous cooker. When one oven is on everything works fine, but when both ovens are switched on together they trip the main 63Amp breaker in the consumer unit before the 32Amp mcb trips. It seems odd that both ovens work perfectly when on individually, but the minute you switch both on together they trip the main 63 Amp breaker in the consumer unit - this has been tested with everything else in the house switched off for all intents and purposes so there is nothing else bar the odd light and fridge still on - so no kettles, immersion heaters etc... Both ovens work great individually and nothing trips circuit breaker wise, but the minute they are both on together they trip out the entire consumer unit - the consumer unit is a 10 way split load and less than a year old so my thinking is a fault with the oven wiring and maybe a loose connection inside it as the oven is a second hand reconditioned one and not new from a store. Has anyone seen this fault before or maybe have an idea what the problem may be - bearing in mind both ovens do work individually? Thank you in advance